avformat: rename asfdec.c to asfdec_f.c

leaving it as asfdec.c confuses git

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 1659 insertions, 0 deletions

diff --git a/libavformat/asfdec_f.c b/libavformat/asfdec_f.c
new file mode 100644
index 0000000..db8791e
--- /dev/null
+++ b/libavformat/asfdec_f.c
@@ -0,0 +1,1659 @@
+/*
+ * ASF compatible demuxer
+ * Copyright (c) 2000, 2001 Fabrice Bellard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <inttypes.h>
+
+#include "libavutil/attributes.h"
+#include "libavutil/avassert.h"
+#include "libavutil/avstring.h"
+#include "libavutil/bswap.h"
+#include "libavutil/common.h"
+#include "libavutil/dict.h"
+#include "libavutil/internal.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/opt.h"
+#include "avformat.h"
+#include "avio_internal.h"
+#include "avlanguage.h"
+#include "id3v2.h"
+#include "internal.h"
+#include "riff.h"
+#include "asf.h"
+#include "asfcrypt.h"
+
+typedef struct ASFPayload {
+    uint8_t type;
+    uint16_t size;
+} ASFPayload;
+
+typedef struct ASFStream {
+    int num;
+    unsigned char seq;
+    /* use for reading */
+    AVPacket pkt;
+    int frag_offset;
+    int packet_obj_size;
+    int timestamp;
+    int64_t duration;
+    int skip_to_key;
+    int pkt_clean;
+
+    int ds_span;                /* descrambling  */
+    int ds_packet_size;
+    int ds_chunk_size;
+
+    int64_t packet_pos;
+
+    uint16_t stream_language_index;
+
+    int      palette_changed;
+    uint32_t palette[256];
+
+    int payload_ext_ct;
+    ASFPayload payload[8];
+} ASFStream;
+
+typedef struct ASFContext {
+    const AVClass *class;
+    int asfid2avid[128];                 ///< conversion table from asf ID 2 AVStream ID
+    ASFStream streams[128];              ///< it's max number and it's not that big
+    uint32_t stream_bitrates[128];       ///< max number of streams, bitrate for each (for streaming)
+    AVRational dar[128];
+    char stream_languages[128][6];       ///< max number of streams, language for each (RFC1766, e.g. en-US)
+    /* non streamed additonnal info */
+    /* packet filling */
+    int packet_size_left;
+    /* only for reading */
+    uint64_t data_offset;                ///< beginning of the first data packet
+    uint64_t data_object_offset;         ///< data object offset (excl. GUID & size)
+    uint64_t data_object_size;           ///< size of the data object
+    int index_read;
+
+    ASFMainHeader hdr;
+
+    int packet_flags;
+    int packet_property;
+    int packet_timestamp;
+    int packet_segsizetype;
+    int packet_segments;
+    int packet_seq;
+    int packet_replic_size;
+    int packet_key_frame;
+    int packet_padsize;
+    unsigned int packet_frag_offset;
+    unsigned int packet_frag_size;
+    int64_t packet_frag_timestamp;
+    int ts_is_pts;
+    int packet_multi_size;
+    int packet_time_delta;
+    int packet_time_start;
+    int64_t packet_pos;
+
+    int stream_index;
+
+    ASFStream *asf_st;                   ///< currently decoded stream
+
+    int no_resync_search;
+    int export_xmp;
+} ASFContext;
+
+static const AVOption options[] = {
+    { "no_resync_search", "Don't try to resynchronize by looking for a certain optional start code", offsetof(ASFContext, no_resync_search), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
+    { "export_xmp", "Export full XMP metadata", offsetof(ASFContext, export_xmp), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
+    { NULL },
+};
+
+static const AVClass asf_class = {
+    .class_name = "asf demuxer",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+#undef NDEBUG
+#include <assert.h>
+
+#define ASF_MAX_STREAMS 127
+#define FRAME_HEADER_SIZE 6
+// Fix Me! FRAME_HEADER_SIZE may be different.
+// (7 is known to be too large for GipsyGuitar.wmv)
+
+#ifdef DEBUG
+static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
+    0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
+};
+
+#define PRINT_IF_GUID(g, cmp) \
+    if (!ff_guidcmp(g, &cmp)) \
+        av_log(NULL, AV_LOG_TRACE, "(GUID: %s) ", # cmp)
+
+static void print_guid(ff_asf_guid *g)
+{
+    int i;
+    PRINT_IF_GUID(g, ff_asf_header);
+    else PRINT_IF_GUID(g, ff_asf_file_header);
+    else PRINT_IF_GUID(g, ff_asf_stream_header);
+    else PRINT_IF_GUID(g, ff_asf_audio_stream);
+    else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
+    else PRINT_IF_GUID(g, ff_asf_video_stream);
+    else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
+    else PRINT_IF_GUID(g, ff_asf_command_stream);
+    else PRINT_IF_GUID(g, ff_asf_comment_header);
+    else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
+    else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
+    else PRINT_IF_GUID(g, ff_asf_data_header);
+    else PRINT_IF_GUID(g, ff_asf_simple_index_header);
+    else PRINT_IF_GUID(g, ff_asf_head1_guid);
+    else PRINT_IF_GUID(g, ff_asf_head2_guid);
+    else PRINT_IF_GUID(g, ff_asf_my_guid);
+    else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
+    else PRINT_IF_GUID(g, ff_asf_extended_content_header);
+    else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
+    else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
+    else PRINT_IF_GUID(g, ff_asf_metadata_header);
+    else PRINT_IF_GUID(g, ff_asf_metadata_library_header);
+    else PRINT_IF_GUID(g, ff_asf_marker_header);
+    else PRINT_IF_GUID(g, stream_bitrate_guid);
+    else PRINT_IF_GUID(g, ff_asf_language_guid);
+    else
+        av_log(NULL, AV_LOG_TRACE, "(GUID: unknown) ");
+    for (i = 0; i < 16; i++)
+        av_log(NULL, AV_LOG_TRACE, " 0x%02x,", (*g)[i]);
+    av_log(NULL, AV_LOG_TRACE, "}\n");
+}
+#undef PRINT_IF_GUID
+#else
+#define print_guid(g) while(0)
+#endif
+
+static int asf_probe(AVProbeData *pd)
+{
+    /* check file header */
+    if (!ff_guidcmp(pd->buf, &ff_asf_header))
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+/* size of type 2 (BOOL) is 32bit for "Extended Content Description Object"
+ * but 16 bit for "Metadata Object" and "Metadata Library Object" */
+static int get_value(AVIOContext *pb, int type, int type2_size)
+{
+    switch (type) {
+    case 2:
+        return (type2_size == 32) ? avio_rl32(pb) : avio_rl16(pb);
+    case 3:
+        return avio_rl32(pb);
+    case 4:
+        return avio_rl64(pb);
+    case 5:
+        return avio_rl16(pb);
+    default:
+        return INT_MIN;
+    }
+}
+
+/* MSDN claims that this should be "compatible with the ID3 frame, APIC",
+ * but in reality this is only loosely similar */
+static int asf_read_picture(AVFormatContext *s, int len)
+{
+    AVPacket pkt          = { 0 };
+    const CodecMime *mime = ff_id3v2_mime_tags;
+    enum  AVCodecID id    = AV_CODEC_ID_NONE;
+    char mimetype[64];
+    uint8_t  *desc = NULL;
+    AVStream   *st = NULL;
+    int ret, type, picsize, desc_len;
+
+    /* type + picsize + mime + desc */
+    if (len < 1 + 4 + 2 + 2) {
+        av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* picture type */
+    type = avio_r8(s->pb);
+    len--;
+    if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
+        av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);
+        type = 0;
+    }
+
+    /* picture data size */
+    picsize = avio_rl32(s->pb);
+    len    -= 4;
+
+    /* picture MIME type */
+    len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));
+    while (mime->id != AV_CODEC_ID_NONE) {
+        if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
+            id = mime->id;
+            break;
+        }
+        mime++;
+    }
+    if (id == AV_CODEC_ID_NONE) {
+        av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
+               mimetype);
+        return 0;
+    }
+
+    if (picsize >= len) {
+        av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",
+               picsize, len);
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* picture description */
+    desc_len = (len - picsize) * 2 + 1;
+    desc     = av_malloc(desc_len);
+    if (!desc)
+        return AVERROR(ENOMEM);
+    len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);
+
+    ret = av_get_packet(s->pb, &pkt, picsize);
+    if (ret < 0)
+        goto fail;
+
+    st  = avformat_new_stream(s, NULL);
+    if (!st) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+    st->disposition              |= AV_DISPOSITION_ATTACHED_PIC;
+    st->codec->codec_type         = AVMEDIA_TYPE_VIDEO;
+    st->codec->codec_id           = id;
+    st->attached_pic              = pkt;
+    st->attached_pic.stream_index = st->index;
+    st->attached_pic.flags       |= AV_PKT_FLAG_KEY;
+
+    if (*desc)
+        av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
+    else
+        av_freep(&desc);
+
+    av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
+
+    return 0;
+
+fail:
+    av_freep(&desc);
+    av_free_packet(&pkt);
+    return ret;
+}
+
+static void get_id3_tag(AVFormatContext *s, int len)
+{
+    ID3v2ExtraMeta *id3v2_extra_meta = NULL;
+
+    ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, len);
+    if (id3v2_extra_meta)
+        ff_id3v2_parse_apic(s, &id3v2_extra_meta);
+    ff_id3v2_free_extra_meta(&id3v2_extra_meta);
+}
+
+static void get_tag(AVFormatContext *s, const char *key, int type, int len, int type2_size)
+{
+    ASFContext *asf = s->priv_data;
+    char *value = NULL;
+    int64_t off = avio_tell(s->pb);
+#define LEN 22
+
+    if ((unsigned)len >= (UINT_MAX - LEN) / 2)
+        return;
+
+    if (!asf->export_xmp && !strncmp(key, "xmp", 3))
+        goto finish;
+
+    value = av_malloc(2 * len + LEN);
+    if (!value)
+        goto finish;
+
+    if (type == 0) {         // UTF16-LE
+        avio_get_str16le(s->pb, len, value, 2 * len + 1);
+    } else if (type == -1) { // ASCII
+        avio_read(s->pb, value, len);
+        value[len]=0;
+    } else if (type == 1) {  // byte array
+        if (!strcmp(key, "WM/Picture")) { // handle cover art
+            asf_read_picture(s, len);
+        } else if (!strcmp(key, "ID3")) { // handle ID3 tag
+            get_id3_tag(s, len);
+        } else {
+            av_log(s, AV_LOG_VERBOSE, "Unsupported byte array in tag %s.\n", key);
+        }
+        goto finish;
+    } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
+        uint64_t num = get_value(s->pb, type, type2_size);
+        snprintf(value, LEN, "%"PRIu64, num);
+    } else if (type == 6) { // (don't) handle GUID
+        av_log(s, AV_LOG_DEBUG, "Unsupported GUID value in tag %s.\n", key);
+        goto finish;
+    } else {
+        av_log(s, AV_LOG_DEBUG,
+               "Unsupported value type %d in tag %s.\n", type, key);
+        goto finish;
+    }
+    if (*value)
+        av_dict_set(&s->metadata, key, value, 0);
+
+finish:
+    av_freep(&value);
+    avio_seek(s->pb, off + len, SEEK_SET);
+}
+
+static int asf_read_file_properties(AVFormatContext *s, int64_t size)
+{
+    ASFContext *asf = s->priv_data;
+    AVIOContext *pb = s->pb;
+
+    ff_get_guid(pb, &asf->hdr.guid);
+    asf->hdr.file_size   = avio_rl64(pb);
+    asf->hdr.create_time = avio_rl64(pb);
+    avio_rl64(pb);                               /* number of packets */
+    asf->hdr.play_time   = avio_rl64(pb);
+    asf->hdr.send_time   = avio_rl64(pb);
+    asf->hdr.preroll     = avio_rl32(pb);
+    asf->hdr.ignore      = avio_rl32(pb);
+    asf->hdr.flags       = avio_rl32(pb);
+    asf->hdr.min_pktsize = avio_rl32(pb);
+    asf->hdr.max_pktsize = avio_rl32(pb);
+    if (asf->hdr.min_pktsize >= (1U << 29))
+        return AVERROR_INVALIDDATA;
+    asf->hdr.max_bitrate = avio_rl32(pb);
+    s->packet_size       = asf->hdr.max_pktsize;
+
+    return 0;
+}
+
+static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
+{
+    ASFContext *asf = s->priv_data;
+    AVIOContext *pb = s->pb;
+    AVStream *st;
+    ASFStream *asf_st;
+    ff_asf_guid g;
+    enum AVMediaType type;
+    int type_specific_size, sizeX;
+    unsigned int tag1;
+    int64_t pos1, pos2, start_time;
+    int test_for_ext_stream_audio, is_dvr_ms_audio = 0;
+
+    if (s->nb_streams == ASF_MAX_STREAMS) {
+        av_log(s, AV_LOG_ERROR, "too many streams\n");
+        return AVERROR(EINVAL);
+    }
+
+    pos1 = avio_tell(pb);
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
+    start_time     = asf->hdr.preroll;
+
+    if (!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
+        int64_t fsize = avio_size(pb);
+        if (fsize <= 0 || (int64_t)asf->hdr.file_size <= 0 ||
+            20*FFABS(fsize - (int64_t)asf->hdr.file_size) < FFMIN(fsize, asf->hdr.file_size))
+            st->duration = asf->hdr.play_time /
+                       (10000000 / 1000) - start_time;
+    }
+    ff_get_guid(pb, &g);
+
+    test_for_ext_stream_audio = 0;
+    if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
+        type = AVMEDIA_TYPE_AUDIO;
+    } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
+        type = AVMEDIA_TYPE_VIDEO;
+    } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
+        type                = AVMEDIA_TYPE_VIDEO;
+        st->codec->codec_id = AV_CODEC_ID_MJPEG;
+    } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
+        type = AVMEDIA_TYPE_DATA;
+    } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
+        test_for_ext_stream_audio = 1;
+        type                      = AVMEDIA_TYPE_UNKNOWN;
+    } else {
+        return -1;
+    }
+    ff_get_guid(pb, &g);
+    avio_skip(pb, 8); /* total_size */
+    type_specific_size = avio_rl32(pb);
+    avio_rl32(pb);
+    st->id = avio_rl16(pb) & 0x7f; /* stream id */
+    // mapping of asf ID to AV stream ID;
+    asf->asfid2avid[st->id] = s->nb_streams - 1;
+    asf_st = &asf->streams[st->id];
+
+    avio_rl32(pb);
+
+    if (test_for_ext_stream_audio) {
+        ff_get_guid(pb, &g);
+        if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
+            type            = AVMEDIA_TYPE_AUDIO;
+            is_dvr_ms_audio = 1;
+            ff_get_guid(pb, &g);
+            avio_rl32(pb);
+            avio_rl32(pb);
+            avio_rl32(pb);
+            ff_get_guid(pb, &g);
+            avio_rl32(pb);
+        }
+    }
+
+    st->codec->codec_type = type;
+    if (type == AVMEDIA_TYPE_AUDIO) {
+        int ret = ff_get_wav_header(pb, st->codec, type_specific_size, 0);
+        if (ret < 0)
+            return ret;
+        if (is_dvr_ms_audio) {
+            // codec_id and codec_tag are unreliable in dvr_ms
+            // files. Set them later by probing stream.
+            st->request_probe    = 1;
+            st->codec->codec_tag = 0;
+        }
+        if (st->codec->codec_id == AV_CODEC_ID_AAC)
+            st->need_parsing = AVSTREAM_PARSE_NONE;
+        else
+            st->need_parsing = AVSTREAM_PARSE_FULL;
+        /* We have to init the frame size at some point .... */
+        pos2 = avio_tell(pb);
+        if (size >= (pos2 + 8 - pos1 + 24)) {
+            asf_st->ds_span        = avio_r8(pb);
+            asf_st->ds_packet_size = avio_rl16(pb);
+            asf_st->ds_chunk_size  = avio_rl16(pb);
+            avio_rl16(pb);  // ds_data_size
+            avio_r8(pb);    // ds_silence_data
+        }
+        if (asf_st->ds_span > 1) {
+            if (!asf_st->ds_chunk_size                                ||
+                (asf_st->ds_packet_size / asf_st->ds_chunk_size <= 1) ||
+                asf_st->ds_packet_size % asf_st->ds_chunk_size)
+                asf_st->ds_span = 0;  // disable descrambling
+        }
+    } else if (type == AVMEDIA_TYPE_VIDEO &&
+               size - (avio_tell(pb) - pos1 + 24) >= 51) {
+        avio_rl32(pb);
+        avio_rl32(pb);
+        avio_r8(pb);
+        avio_rl16(pb);        /* size */
+        sizeX             = avio_rl32(pb); /* size */
+        st->codec->width  = avio_rl32(pb);
+        st->codec->height = avio_rl32(pb);
+        /* not available for asf */
+        avio_rl16(pb); /* panes */
+        st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
+        tag1                             = avio_rl32(pb);
+        avio_skip(pb, 20);
+        if (sizeX > 40) {
+            st->codec->extradata_size = ffio_limit(pb, sizeX - 40);
+            st->codec->extradata      = av_mallocz(st->codec->extradata_size +
+                                                   FF_INPUT_BUFFER_PADDING_SIZE);
+            if (!st->codec->extradata)
+                return AVERROR(ENOMEM);
+            avio_read(pb, st->codec->extradata, st->codec->extradata_size);
+        }
+
+        /* Extract palette from extradata if bpp <= 8 */
+        /* This code assumes that extradata contains only palette */
+        /* This is true for all paletted codecs implemented in libavcodec */
+        if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
+#if HAVE_BIGENDIAN
+            int i;
+            for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE) / 4; i++)
+                asf_st->palette[i] = av_bswap32(((uint32_t *)st->codec->extradata)[i]);
+#else
+            memcpy(asf_st->palette, st->codec->extradata,
+                   FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
+#endif
+            asf_st->palette_changed = 1;
+        }
+
+        st->codec->codec_tag = tag1;
+        st->codec->codec_id  = ff_codec_get_id(ff_codec_bmp_tags, tag1);
+        if (tag1 == MKTAG('D', 'V', 'R', ' ')) {
+            st->need_parsing = AVSTREAM_PARSE_FULL;
+            /* issue658 contains wrong w/h and MS even puts a fake seq header
+             * with wrong w/h in extradata while a correct one is in the stream.
+             * maximum lameness */
+            st->codec->width      =
+                st->codec->height = 0;
+            av_freep(&st->codec->extradata);
+            st->codec->extradata_size = 0;
+        }
+        if (st->codec->codec_id == AV_CODEC_ID_H264)
+            st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
+        if (st->codec->codec_id == AV_CODEC_ID_MPEG4)
+            st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
+    }
+    pos2 = avio_tell(pb);
+    avio_skip(pb, size - (pos2 - pos1 + 24));
+
+    return 0;
+}
+
+static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
+{
+    ASFContext *asf = s->priv_data;
+    AVIOContext *pb = s->pb;
+    ff_asf_guid g;
+    int ext_len, payload_ext_ct, stream_ct, i;
+    uint32_t leak_rate, stream_num;
+    unsigned int stream_languageid_index;
+
+    avio_rl64(pb); // starttime
+    avio_rl64(pb); // endtime
+    leak_rate = avio_rl32(pb); // leak-datarate
+    avio_rl32(pb); // bucket-datasize
+    avio_rl32(pb); // init-bucket-fullness
+    avio_rl32(pb); // alt-leak-datarate
+    avio_rl32(pb); // alt-bucket-datasize
+    avio_rl32(pb); // alt-init-bucket-fullness
+    avio_rl32(pb); // max-object-size
+    avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
+    stream_num = avio_rl16(pb); // stream-num
+
+    stream_languageid_index = avio_rl16(pb); // stream-language-id-index
+    if (stream_num < 128)
+        asf->streams[stream_num].stream_language_index = stream_languageid_index;
+
+    avio_rl64(pb); // avg frametime in 100ns units
+    stream_ct      = avio_rl16(pb); // stream-name-count
+    payload_ext_ct = avio_rl16(pb); // payload-extension-system-count
+
+    if (stream_num < 128) {
+        asf->stream_bitrates[stream_num] = leak_rate;
+        asf->streams[stream_num].payload_ext_ct = 0;
+    }
+
+    for (i = 0; i < stream_ct; i++) {
+        avio_rl16(pb);
+        ext_len = avio_rl16(pb);
+        avio_skip(pb, ext_len);
+    }
+
+    for (i = 0; i < payload_ext_ct; i++) {
+        int size;
+        ff_get_guid(pb, &g);
+        size = avio_rl16(pb);
+        ext_len = avio_rl32(pb);
+        avio_skip(pb, ext_len);
+        if (stream_num < 128 && i < FF_ARRAY_ELEMS(asf->streams[stream_num].payload)) {
+            ASFPayload *p = &asf->streams[stream_num].payload[i];
+            p->type = g[0];
+            p->size = size;
+            av_log(s, AV_LOG_DEBUG, "Payload extension %x %d\n", g[0], p->size );
+            asf->streams[stream_num].payload_ext_ct ++;
+        }
+    }
+
+    return 0;
+}
+
+static int asf_read_content_desc(AVFormatContext *s, int64_t size)
+{
+    AVIOContext *pb = s->pb;
+    int len1, len2, len3, len4, len5;
+
+    len1 = avio_rl16(pb);
+    len2 = avio_rl16(pb);
+    len3 = avio_rl16(pb);
+    len4 = avio_rl16(pb);
+    len5 = avio_rl16(pb);
+    get_tag(s, "title", 0, len1, 32);
+    get_tag(s, "author", 0, len2, 32);
+    get_tag(s, "copyright", 0, len3, 32);
+    get_tag(s, "comment", 0, len4, 32);
+    avio_skip(pb, len5);
+
+    return 0;
+}
+
+static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)
+{
+    AVIOContext *pb = s->pb;
+    ASFContext *asf = s->priv_data;
+    int desc_count, i, ret;
+
+    desc_count = avio_rl16(pb);
+    for (i = 0; i < desc_count; i++) {
+        int name_len, value_type, value_len;
+        char name[1024];
+
+        name_len = avio_rl16(pb);
+        if (name_len % 2)   // must be even, broken lavf versions wrote len-1
+            name_len += 1;
+        if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
+            avio_skip(pb, name_len - ret);
+        value_type = avio_rl16(pb);
+        value_len  = avio_rl16(pb);
+        if (!value_type && value_len % 2)
+            value_len += 1;
+        /* My sample has that stream set to 0 maybe that mean the container.
+         * ASF stream count starts at 1. I am using 0 to the container value
+         * since it's unused. */
+        if (!strcmp(name, "AspectRatioX"))
+            asf->dar[0].num = get_value(s->pb, value_type, 32);
+        else if (!strcmp(name, "AspectRatioY"))
+            asf->dar[0].den = get_value(s->pb, value_type, 32);
+        else
+            get_tag(s, name, value_type, value_len, 32);
+    }
+
+    return 0;
+}
+
+static int asf_read_language_list(AVFormatContext *s, int64_t size)
+{
+    AVIOContext *pb = s->pb;
+    ASFContext *asf = s->priv_data;
+    int j, ret;
+    int stream_count = avio_rl16(pb);
+    for (j = 0; j < stream_count; j++) {
+        char lang[6];
+        unsigned int lang_len = avio_r8(pb);
+        if ((ret = avio_get_str16le(pb, lang_len, lang,
+                                    sizeof(lang))) < lang_len)
+            avio_skip(pb, lang_len - ret);
+        if (j < 128)
+            av_strlcpy(asf->stream_languages[j], lang,
+                       sizeof(*asf->stream_languages));
+    }
+
+    return 0;
+}
+
+static int asf_read_metadata(AVFormatContext *s, int64_t size)
+{
+    AVIOContext *pb = s->pb;
+    ASFContext *asf = s->priv_data;
+    int n, stream_num, name_len, value_len;
+    int ret, i;
+    n = avio_rl16(pb);
+
+    for (i = 0; i < n; i++) {
+        char name[1024];
+        int value_type;
+
+        avio_rl16(pb);  // lang_list_index
+        stream_num = avio_rl16(pb);
+        name_len   = avio_rl16(pb);
+        value_type = avio_rl16(pb); /* value_type */
+        value_len  = avio_rl32(pb);
+
+        if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
+            avio_skip(pb, name_len - ret);
+        av_log(s, AV_LOG_TRACE, "%d stream %d name_len %2d type %d len %4d <%s>\n",
+                i, stream_num, name_len, value_type, value_len, name);
+
+        if (!strcmp(name, "AspectRatioX")){
+            int aspect_x = get_value(s->pb, value_type, 16);
+            if(stream_num < 128)
+                asf->dar[stream_num].num = aspect_x;
+        } else if(!strcmp(name, "AspectRatioY")){
+            int aspect_y = get_value(s->pb, value_type, 16);
+            if(stream_num < 128)
+                asf->dar[stream_num].den = aspect_y;
+        } else {
+            get_tag(s, name, value_type, value_len, 16);
+        }
+    }
+
+    return 0;
+}
+
+static int asf_read_marker(AVFormatContext *s, int64_t size)
+{
+    AVIOContext *pb = s->pb;
+    ASFContext *asf = s->priv_data;
+    int i, count, name_len, ret;
+    char name[1024];
+
+    avio_rl64(pb);            // reserved 16 bytes
+    avio_rl64(pb);            // ...
+    count = avio_rl32(pb);    // markers count
+    avio_rl16(pb);            // reserved 2 bytes
+    name_len = avio_rl16(pb); // name length
+    for (i = 0; i < name_len; i++)
+        avio_r8(pb); // skip the name
+
+    for (i = 0; i < count; i++) {
+        int64_t pres_time;
+        int name_len;
+
+        avio_rl64(pb);             // offset, 8 bytes
+        pres_time = avio_rl64(pb); // presentation time
+        pres_time -= asf->hdr.preroll * 10000;
+        avio_rl16(pb);             // entry length
+        avio_rl32(pb);             // send time
+        avio_rl32(pb);             // flags
+        name_len = avio_rl32(pb);  // name length
+        if ((ret = avio_get_str16le(pb, name_len * 2, name,
+                                    sizeof(name))) < name_len)
+            avio_skip(pb, name_len - ret);
+        avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pres_time,
+                           AV_NOPTS_VALUE, name);
+    }
+
+    return 0;
+}
+
+static int asf_read_header(AVFormatContext *s)
+{
+    ASFContext *asf = s->priv_data;
+    ff_asf_guid g;
+    AVIOContext *pb = s->pb;
+    int i;
+    int64_t gsize;
+
+    ff_get_guid(pb, &g);
+    if (ff_guidcmp(&g, &ff_asf_header))
+        return AVERROR_INVALIDDATA;
+    avio_rl64(pb);
+    avio_rl32(pb);
+    avio_r8(pb);
+    avio_r8(pb);
+    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
+
+    for (i = 0; i<128; i++)
+        asf->streams[i].stream_language_index = 128; // invalid stream index means no language info
+
+    for (;;) {
+        uint64_t gpos = avio_tell(pb);
+        ff_get_guid(pb, &g);
+        gsize = avio_rl64(pb);
+        print_guid(&g);
+        if (!ff_guidcmp(&g, &ff_asf_data_header)) {
+            asf->data_object_offset = avio_tell(pb);
+            /* If not streaming, gsize is not unlimited (how?),
+             * and there is enough space in the file.. */
+            if (!(asf->hdr.flags & 0x01) && gsize >= 100)
+                asf->data_object_size = gsize - 24;
+            else
+                asf->data_object_size = (uint64_t)-1;
+            break;
+        }
+        if (gsize < 24)
+            return AVERROR_INVALIDDATA;
+        if (!ff_guidcmp(&g, &ff_asf_file_header)) {
+            int ret = asf_read_file_properties(s, gsize);
+            if (ret < 0)
+                return ret;
+        } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
+            int ret = asf_read_stream_properties(s, gsize);
+            if (ret < 0)
+                return ret;
+        } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
+            asf_read_content_desc(s, gsize);
+        } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
+            asf_read_language_list(s, gsize);
+        } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
+            asf_read_ext_content_desc(s, gsize);
+        } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
+            asf_read_metadata(s, gsize);
+        } else if (!ff_guidcmp(&g, &ff_asf_metadata_library_header)) {
+            asf_read_metadata(s, gsize);
+        } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
+            asf_read_ext_stream_properties(s, gsize);
+
+            // there could be a optional stream properties object to follow
+            // if so the next iteration will pick it up
+            continue;
+        } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
+            ff_get_guid(pb, &g);
+            avio_skip(pb, 6);
+            continue;
+        } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
+            asf_read_marker(s, gsize);
+        } else if (avio_feof(pb)) {
+            return AVERROR_EOF;
+        } else {
+            if (!s->keylen) {
+                if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
+                    unsigned int len;
+                    int ret;
+                    AVPacket pkt;
+                    av_log(s, AV_LOG_WARNING,
+                           "DRM protected stream detected, decoding will likely fail!\n");
+                    len= avio_rl32(pb);
+                    av_log(s, AV_LOG_DEBUG, "Secret data:\n");
+
+                    if ((ret = av_get_packet(pb, &pkt, len)) < 0)
+                        return ret;
+                    av_hex_dump_log(s, AV_LOG_DEBUG, pkt.data, pkt.size);
+                    av_free_packet(&pkt);
+                    len= avio_rl32(pb);
+                    get_tag(s, "ASF_Protection_Type", -1, len, 32);
+                    len= avio_rl32(pb);
+                    get_tag(s, "ASF_Key_ID", -1, len, 32);
+                    len= avio_rl32(pb);
+                    get_tag(s, "ASF_License_URL", -1, len, 32);
+                } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
+                    av_log(s, AV_LOG_WARNING,
+                           "Ext DRM protected stream detected, decoding will likely fail!\n");
+                    av_dict_set(&s->metadata, "encryption", "ASF Extended Content Encryption", 0);
+                } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
+                    av_log(s, AV_LOG_INFO, "Digital signature detected!\n");
+                }
+            }
+        }
+        if (avio_tell(pb) != gpos + gsize)
+            av_log(s, AV_LOG_DEBUG,
+                   "gpos mismatch our pos=%"PRIu64", end=%"PRId64"\n",
+                   avio_tell(pb) - gpos, gsize);
+        avio_seek(pb, gpos + gsize, SEEK_SET);
+    }
+    ff_get_guid(pb, &g);
+    avio_rl64(pb);
+    avio_r8(pb);
+    avio_r8(pb);
+    if (avio_feof(pb))
+        return AVERROR_EOF;
+    asf->data_offset      = avio_tell(pb);
+    asf->packet_size_left = 0;
+
+    for (i = 0; i < 128; i++) {
+        int stream_num = asf->asfid2avid[i];
+        if (stream_num >= 0) {
+            AVStream *st = s->streams[stream_num];
+            if (!st->codec->bit_rate)
+                st->codec->bit_rate = asf->stream_bitrates[i];
+            if (asf->dar[i].num > 0 && asf->dar[i].den > 0) {
+                av_reduce(&st->sample_aspect_ratio.num,
+                          &st->sample_aspect_ratio.den,
+                          asf->dar[i].num, asf->dar[i].den, INT_MAX);
+            } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) &&
+                       // Use ASF container value if the stream doesn't set AR.
+                       (st->codec->codec_type == AVMEDIA_TYPE_VIDEO))
+                av_reduce(&st->sample_aspect_ratio.num,
+                          &st->sample_aspect_ratio.den,
+                          asf->dar[0].num, asf->dar[0].den, INT_MAX);
+
+            av_log(s, AV_LOG_TRACE, "i=%d, st->codec->codec_type:%d, asf->dar %d:%d sar=%d:%d\n",
+                    i, st->codec->codec_type, asf->dar[i].num, asf->dar[i].den,
+                    st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
+
+            // copy and convert language codes to the frontend
+            if (asf->streams[i].stream_language_index < 128) {
+                const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
+                if (rfc1766 && strlen(rfc1766) > 1) {
+                    const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
+                    const char *iso6392       = av_convert_lang_to(primary_tag,
+                                                                   AV_LANG_ISO639_2_BIBL);
+                    if (iso6392)
+                        av_dict_set(&st->metadata, "language", iso6392, 0);
+                }
+            }
+        }
+    }
+
+    ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
+
+    return 0;
+}
+
+#define DO_2BITS(bits, var, defval)             \
+    switch (bits & 3) {                         \
+    case 3:                                     \
+        var = avio_rl32(pb);                    \
+        rsize += 4;                             \
+        break;                                  \
+    case 2:                                     \
+        var = avio_rl16(pb);                    \
+        rsize += 2;                             \
+        break;                                  \
+    case 1:                                     \
+        var = avio_r8(pb);                      \
+        rsize++;                                \
+        break;                                  \
+    default:                                    \
+        var = defval;                           \
+        break;                                  \
+    }
+
+/**
+ * Load a single ASF packet into the demuxer.
+ * @param s demux context
+ * @param pb context to read data from
+ * @return 0 on success, <0 on error
+ */
+static int asf_get_packet(AVFormatContext *s, AVIOContext *pb)
+{
+    ASFContext *asf = s->priv_data;
+    uint32_t packet_length, padsize;
+    int rsize = 8;
+    int c, d, e, off;
+
+    // if we do not know packet size, allow skipping up to 32 kB
+    off = 32768;
+    if (asf->no_resync_search)
+        off = 3;
+    else if (s->packet_size > 0)
+        off = (avio_tell(pb) - s->internal->data_offset) % s->packet_size + 3;
+
+    c = d = e = -1;
+    while (off-- > 0) {
+        c = d;
+        d = e;
+        e = avio_r8(pb);
+        if (c == 0x82 && !d && !e)
+            break;
+    }
+
+    if (c != 0x82) {
+        /* This code allows handling of -EAGAIN at packet boundaries (i.e.
+         * if the packet sync code above triggers -EAGAIN). This does not
+         * imply complete -EAGAIN handling support at random positions in
+         * the stream. */
+        if (pb->error == AVERROR(EAGAIN))
+            return AVERROR(EAGAIN);
+        if (!avio_feof(pb))
+            av_log(s, AV_LOG_ERROR,
+                   "ff asf bad header %x  at:%"PRId64"\n", c, avio_tell(pb));
+    }
+    if ((c & 0x8f) == 0x82) {
+        if (d || e) {
+            if (!avio_feof(pb))
+                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
+            return AVERROR_INVALIDDATA;
+        }
+        c      = avio_r8(pb);
+        d      = avio_r8(pb);
+        rsize += 3;
+    } else if(!avio_feof(pb)) {
+        avio_seek(pb, -1, SEEK_CUR); // FIXME
+    }
+
+    asf->packet_flags    = c;
+    asf->packet_property = d;
+
+    DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
+    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
+    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
+
+    // the following checks prevent overflows and infinite loops
+    if (!packet_length || packet_length >= (1U << 29)) {
+        av_log(s, AV_LOG_ERROR,
+               "invalid packet_length %"PRIu32" at:%"PRId64"\n",
+               packet_length, avio_tell(pb));
+        return AVERROR_INVALIDDATA;
+    }
+    if (padsize >= packet_length) {
+        av_log(s, AV_LOG_ERROR,
+               "invalid padsize %"PRIu32" at:%"PRId64"\n", padsize, avio_tell(pb));
+        return AVERROR_INVALIDDATA;
+    }
+
+    asf->packet_timestamp = avio_rl32(pb);
+    avio_rl16(pb); /* duration */
+    // rsize has at least 11 bytes which have to be present
+
+    if (asf->packet_flags & 0x01) {
+        asf->packet_segsizetype = avio_r8(pb);
+        rsize++;
+        asf->packet_segments = asf->packet_segsizetype & 0x3f;
+    } else {
+        asf->packet_segments    = 1;
+        asf->packet_segsizetype = 0x80;
+    }
+    if (rsize > packet_length - padsize) {
+        asf->packet_size_left = 0;
+        av_log(s, AV_LOG_ERROR,
+               "invalid packet header length %d for pktlen %"PRIu32"-%"PRIu32" at %"PRId64"\n",
+               rsize, packet_length, padsize, avio_tell(pb));
+        return AVERROR_INVALIDDATA;
+    }
+    asf->packet_size_left = packet_length - padsize - rsize;
+    if (packet_length < asf->hdr.min_pktsize)
+        padsize += asf->hdr.min_pktsize - packet_length;
+    asf->packet_padsize = padsize;
+    av_log(s, AV_LOG_TRACE, "packet: size=%d padsize=%d  left=%d\n",
+            s->packet_size, asf->packet_padsize, asf->packet_size_left);
+    return 0;
+}
+
+/**
+ *
+ * @return <0 if error
+ */
+static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb)
+{
+    ASFContext *asf = s->priv_data;
+    ASFStream *asfst;
+    int rsize       = 1;
+    int num         = avio_r8(pb);
+    int i;
+    int64_t ts0, ts1 av_unused;
+
+    asf->packet_segments--;
+    asf->packet_key_frame = num >> 7;
+    asf->stream_index     = asf->asfid2avid[num & 0x7f];
+    asfst                 = &asf->streams[num & 0x7f];
+    // sequence should be ignored!
+    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
+    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
+    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
+    av_log(asf, AV_LOG_TRACE, "key:%d stream:%d seq:%d offset:%d replic_size:%d\n",
+            asf->packet_key_frame, asf->stream_index, asf->packet_seq,
+            asf->packet_frag_offset, asf->packet_replic_size);
+    if (rsize+(int64_t)asf->packet_replic_size > asf->packet_size_left) {
+        av_log(s, AV_LOG_ERROR, "packet_replic_size %d is invalid\n", asf->packet_replic_size);
+        return AVERROR_INVALIDDATA;
+    }
+    if (asf->packet_replic_size >= 8) {
+        int64_t end = avio_tell(pb) + asf->packet_replic_size;
+        AVRational aspect;
+        asfst->packet_obj_size = avio_rl32(pb);
+        if (asfst->packet_obj_size >= (1 << 24) || asfst->packet_obj_size < 0) {
+            av_log(s, AV_LOG_ERROR, "packet_obj_size %d invalid\n", asfst->packet_obj_size);
+            asfst->packet_obj_size = 0;
+            return AVERROR_INVALIDDATA;
+        }
+        asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
+
+        for (i = 0; i < asfst->payload_ext_ct; i++) {
+            ASFPayload *p = &asfst->payload[i];
+            int size = p->size;
+            int64_t payend;
+            if (size == 0xFFFF)
+                size = avio_rl16(pb);
+            payend = avio_tell(pb) + size;
+            if (payend > end) {
+                av_log(s, AV_LOG_ERROR, "too long payload\n");
+                break;
+            }
+            switch (p->type) {
+            case 0x50:
+//              duration = avio_rl16(pb);
+                break;
+            case 0x54:
+                aspect.num = avio_r8(pb);
+                aspect.den = avio_r8(pb);
+                if (aspect.num > 0 && aspect.den > 0 && asf->stream_index >= 0) {
+                    s->streams[asf->stream_index]->sample_aspect_ratio = aspect;
+                }
+                break;
+            case 0x2A:
+                avio_skip(pb, 8);
+                ts0 = avio_rl64(pb);
+                ts1 = avio_rl64(pb);
+                if (ts0!= -1) asf->packet_frag_timestamp = ts0/10000;
+                else          asf->packet_frag_timestamp = AV_NOPTS_VALUE;
+                asf->ts_is_pts = 1;
+                break;
+            case 0x5B:
+            case 0xB7:
+            case 0xCC:
+            case 0xC0:
+            case 0xA0:
+                //unknown
+                break;
+            }
+            avio_seek(pb, payend, SEEK_SET);
+        }
+
+        avio_seek(pb, end, SEEK_SET);
+        rsize += asf->packet_replic_size; // FIXME - check validity
+    } else if (asf->packet_replic_size == 1) {
+        // multipacket - frag_offset is beginning timestamp
+        asf->packet_time_start     = asf->packet_frag_offset;
+        asf->packet_frag_offset    = 0;
+        asf->packet_frag_timestamp = asf->packet_timestamp;
+
+        asf->packet_time_delta = avio_r8(pb);
+        rsize++;
+    } else if (asf->packet_replic_size != 0) {
+        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n",
+               asf->packet_replic_size);
+        return AVERROR_INVALIDDATA;
+    }
+    if (asf->packet_flags & 0x01) {
+        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
+        if (rsize > asf->packet_size_left) {
+            av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
+            return AVERROR_INVALIDDATA;
+        } else if (asf->packet_frag_size > asf->packet_size_left - rsize) {
+            if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
+                av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n",
+                       asf->packet_size_left, rsize);
+                return AVERROR_INVALIDDATA;
+            } else {
+                int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
+                asf->packet_size_left += diff;
+                asf->packet_padsize   -= diff;
+            }
+        }
+    } else {
+        asf->packet_frag_size = asf->packet_size_left - rsize;
+    }
+    if (asf->packet_replic_size == 1) {
+        asf->packet_multi_size = asf->packet_frag_size;
+        if (asf->packet_multi_size > asf->packet_size_left)
+            return AVERROR_INVALIDDATA;
+    }
+    asf->packet_size_left -= rsize;
+
+    return 0;
+}
+
+/**
+ * Parse data from individual ASF packets (which were previously loaded
+ * with asf_get_packet()).
+ * @param s demux context
+ * @param pb context to read data from
+ * @param pkt pointer to store packet data into
+ * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
+ *          packets need to be loaded (through asf_get_packet())
+ */
+static int asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
+{
+    ASFContext *asf   = s->priv_data;
+    ASFStream *asf_st = 0;
+    for (;;) {
+        int ret;
+        if (avio_feof(pb))
+            return AVERROR_EOF;
+        if (asf->packet_size_left < FRAME_HEADER_SIZE ||
+            asf->packet_segments < 1 && asf->packet_time_start == 0) {
+            int ret = asf->packet_size_left + asf->packet_padsize;
+
+            if (asf->packet_size_left && asf->packet_size_left < FRAME_HEADER_SIZE)
+                av_log(s, AV_LOG_WARNING, "Skip due to FRAME_HEADER_SIZE\n");
+
+            assert(ret >= 0);
+            /* fail safe */
+            avio_skip(pb, ret);
+
+            asf->packet_pos = avio_tell(pb);
+            if (asf->data_object_size != (uint64_t)-1 &&
+                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
+                return AVERROR_EOF;  /* Do not exceed the size of the data object */
+            return 1;
+        }
+        if (asf->packet_time_start == 0) {
+            if (asf_read_frame_header(s, pb) < 0) {
+                asf->packet_time_start = asf->packet_segments = 0;
+                continue;
+            }
+            if (asf->stream_index < 0 ||
+                s->streams[asf->stream_index]->discard >= AVDISCARD_ALL ||
+                (!asf->packet_key_frame &&
+                 (s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY || asf->streams[s->streams[asf->stream_index]->id].skip_to_key))) {
+                asf->packet_time_start = 0;
+                /* unhandled packet (should not happen) */
+                avio_skip(pb, asf->packet_frag_size);
+                asf->packet_size_left -= asf->packet_frag_size;
+                if (asf->stream_index < 0)
+                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n",
+                           asf->packet_frag_size);
+                continue;
+            }
+            asf->asf_st = &asf->streams[s->streams[asf->stream_index]->id];
+            asf->asf_st->skip_to_key = 0;
+        }
+        asf_st = asf->asf_st;
+        av_assert0(asf_st);
+
+        if (!asf_st->frag_offset && asf->packet_frag_offset) {
+            av_log(s, AV_LOG_TRACE, "skipping asf data pkt with fragment offset for "
+                    "stream:%d, expected:%d but got %d from pkt)\n",
+                    asf->stream_index, asf_st->frag_offset,
+                    asf->packet_frag_offset);
+            avio_skip(pb, asf->packet_frag_size);
+            asf->packet_size_left -= asf->packet_frag_size;
+            continue;
+        }
+
+        if (asf->packet_replic_size == 1) {
+            // frag_offset is here used as the beginning timestamp
+            asf->packet_frag_timestamp = asf->packet_time_start;
+            asf->packet_time_start    += asf->packet_time_delta;
+            asf_st->packet_obj_size    = asf->packet_frag_size = avio_r8(pb);
+            asf->packet_size_left--;
+            asf->packet_multi_size--;
+            if (asf->packet_multi_size < asf_st->packet_obj_size) {
+                asf->packet_time_start = 0;
+                avio_skip(pb, asf->packet_multi_size);
+                asf->packet_size_left -= asf->packet_multi_size;
+                continue;
+            }
+            asf->packet_multi_size -= asf_st->packet_obj_size;
+        }
+
+        if (asf_st->pkt.size != asf_st->packet_obj_size ||
+            // FIXME is this condition sufficient?
+            asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) {
+            int ret;
+
+            if (asf_st->pkt.data) {
+                av_log(s, AV_LOG_INFO,
+                       "freeing incomplete packet size %d, new %d\n",
+                       asf_st->pkt.size, asf_st->packet_obj_size);
+                asf_st->frag_offset = 0;
+                av_free_packet(&asf_st->pkt);
+            }
+            /* new packet */
+            if ((ret = av_new_packet(&asf_st->pkt, asf_st->packet_obj_size)) < 0)
+                return ret;
+            asf_st->seq              = asf->packet_seq;
+            if (asf->ts_is_pts) {
+                asf_st->pkt.pts          = asf->packet_frag_timestamp - asf->hdr.preroll;
+            } else
+                asf_st->pkt.dts          = asf->packet_frag_timestamp - asf->hdr.preroll;
+            asf_st->pkt.stream_index = asf->stream_index;
+            asf_st->pkt.pos          = asf_st->packet_pos = asf->packet_pos;
+            asf_st->pkt_clean        = 0;
+
+            if (asf_st->pkt.data && asf_st->palette_changed) {
+                uint8_t *pal;
+                pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,
+                                              AVPALETTE_SIZE);
+                if (!pal) {
+                    av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
+                } else {
+                    memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
+                    asf_st->palette_changed = 0;
+                }
+            }
+            av_log(asf, AV_LOG_TRACE, "new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
+                    asf->stream_index, asf->packet_key_frame,
+                    asf_st->pkt.flags & AV_PKT_FLAG_KEY,
+                    s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO,
+                    asf_st->packet_obj_size);
+            if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
+                asf->packet_key_frame = 1;
+            if (asf->packet_key_frame)
+                asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
+        }
+
+        /* read data */
+        av_log(asf, AV_LOG_TRACE, "READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
+                s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
+                asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
+        asf->packet_size_left -= asf->packet_frag_size;
+        if (asf->packet_size_left < 0)
+            continue;
+
+        if (asf->packet_frag_offset >= asf_st->pkt.size ||
+            asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset) {
+            av_log(s, AV_LOG_ERROR,
+                   "packet fragment position invalid %u,%u not in %u\n",
+                   asf->packet_frag_offset, asf->packet_frag_size,
+                   asf_st->pkt.size);
+            continue;
+        }
+
+        if (asf->packet_frag_offset != asf_st->frag_offset && !asf_st->pkt_clean) {
+            memset(asf_st->pkt.data + asf_st->frag_offset, 0, asf_st->pkt.size - asf_st->frag_offset);
+            asf_st->pkt_clean = 1;
+        }
+
+        ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
+                        asf->packet_frag_size);
+        if (ret != asf->packet_frag_size) {
+            if (ret < 0 || asf->packet_frag_offset + ret == 0)
+                return ret < 0 ? ret : AVERROR_EOF;
+
+            if (asf_st->ds_span > 1) {
+                // scrambling, we can either drop it completely or fill the remainder
+                // TODO: should we fill the whole packet instead of just the current
+                // fragment?
+                memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
+                       asf->packet_frag_size - ret);
+                ret = asf->packet_frag_size;
+            } else {
+                // no scrambling, so we can return partial packets
+                av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
+            }
+        }
+        if (s->key && s->keylen == 20)
+            ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
+                            ret);
+        asf_st->frag_offset += ret;
+        /* test if whole packet is read */
+        if (asf_st->frag_offset == asf_st->pkt.size) {
+            // workaround for macroshit radio DVR-MS files
+            if (s->streams[asf->stream_index]->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO &&
+                asf_st->pkt.size > 100) {
+                int i;
+                for (i = 0; i < asf_st->pkt.size && !asf_st->pkt.data[i]; i++)
+                    ;
+                if (i == asf_st->pkt.size) {
+                    av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
+                    asf_st->frag_offset = 0;
+                    av_free_packet(&asf_st->pkt);
+                    continue;
+                }
+            }
+
+            /* return packet */
+            if (asf_st->ds_span > 1) {
+                if (asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span) {
+                    av_log(s, AV_LOG_ERROR,
+                           "pkt.size != ds_packet_size * ds_span (%d %d %d)\n",
+                           asf_st->pkt.size, asf_st->ds_packet_size,
+                           asf_st->ds_span);
+                } else {
+                    /* packet descrambling */
+                    AVBufferRef *buf = av_buffer_alloc(asf_st->pkt.size +
+                                                       FF_INPUT_BUFFER_PADDING_SIZE);
+                    if (buf) {
+                        uint8_t *newdata = buf->data;
+                        int offset = 0;
+                        memset(newdata + asf_st->pkt.size, 0,
+                               FF_INPUT_BUFFER_PADDING_SIZE);
+                        while (offset < asf_st->pkt.size) {
+                            int off = offset / asf_st->ds_chunk_size;
+                            int row = off / asf_st->ds_span;
+                            int col = off % asf_st->ds_span;
+                            int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
+                            assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
+                            assert(idx + 1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
+                            memcpy(newdata + offset,
+                                   asf_st->pkt.data + idx * asf_st->ds_chunk_size,
+                                   asf_st->ds_chunk_size);
+                            offset += asf_st->ds_chunk_size;
+                        }
+                        av_buffer_unref(&asf_st->pkt.buf);
+                        asf_st->pkt.buf  = buf;
+                        asf_st->pkt.data = buf->data;
+                    }
+                }
+            }
+            asf_st->frag_offset         = 0;
+            *pkt                        = asf_st->pkt;
+#if FF_API_DESTRUCT_PACKET
+FF_DISABLE_DEPRECATION_WARNINGS
+            asf_st->pkt.destruct        = NULL;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+            asf_st->pkt.buf             = 0;
+            asf_st->pkt.size            = 0;
+            asf_st->pkt.data            = 0;
+            asf_st->pkt.side_data_elems = 0;
+            asf_st->pkt.side_data       = NULL;
+            break; // packet completed
+        }
+    }
+    return 0;
+}
+
+static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    ASFContext *asf = s->priv_data;
+
+    for (;;) {
+        int ret;
+
+        /* parse cached packets, if any */
+        if ((ret = asf_parse_packet(s, s->pb, pkt)) <= 0)
+            return ret;
+        if ((ret = asf_get_packet(s, s->pb)) < 0)
+            assert(asf->packet_size_left < FRAME_HEADER_SIZE ||
+                   asf->packet_segments < 1);
+        asf->packet_time_start = 0;
+    }
+}
+
+// Added to support seeking after packets have been read
+// If information is not reset, read_packet fails due to
+// leftover information from previous reads
+static void asf_reset_header(AVFormatContext *s)
+{
+    ASFContext *asf = s->priv_data;
+    ASFStream *asf_st;
+    int i;
+
+    asf->packet_size_left      = 0;
+    asf->packet_flags          = 0;
+    asf->packet_property       = 0;
+    asf->packet_timestamp      = 0;
+    asf->packet_segsizetype    = 0;
+    asf->packet_segments       = 0;
+    asf->packet_seq            = 0;
+    asf->packet_replic_size    = 0;
+    asf->packet_key_frame      = 0;
+    asf->packet_padsize        = 0;
+    asf->packet_frag_offset    = 0;
+    asf->packet_frag_size      = 0;
+    asf->packet_frag_timestamp = 0;
+    asf->packet_multi_size     = 0;
+    asf->packet_time_delta     = 0;
+    asf->packet_time_start     = 0;
+
+    for (i = 0; i < 128; i++) {
+        asf_st = &asf->streams[i];
+        av_free_packet(&asf_st->pkt);
+        asf_st->packet_obj_size = 0;
+        asf_st->frag_offset = 0;
+        asf_st->seq         = 0;
+    }
+    asf->asf_st = NULL;
+}
+
+static void skip_to_key(AVFormatContext *s)
+{
+    ASFContext *asf = s->priv_data;
+    int i;
+
+    for (i = 0; i < 128; i++) {
+        int j = asf->asfid2avid[i];
+        ASFStream *asf_st = &asf->streams[i];
+        if (j < 0 || s->streams[j]->codec->codec_type != AVMEDIA_TYPE_VIDEO)
+            continue;
+
+        asf_st->skip_to_key = 1;
+    }
+}
+
+static int asf_read_close(AVFormatContext *s)
+{
+    asf_reset_header(s);
+
+    return 0;
+}
+
+static int64_t asf_read_pts(AVFormatContext *s, int stream_index,
+                            int64_t *ppos, int64_t pos_limit)
+{
+    ASFContext *asf     = s->priv_data;
+    AVPacket pkt1, *pkt = &pkt1;
+    ASFStream *asf_st;
+    int64_t pts;
+    int64_t pos = *ppos;
+    int i;
+    int64_t start_pos[ASF_MAX_STREAMS];
+
+    for (i = 0; i < s->nb_streams; i++)
+        start_pos[i] = pos;
+
+    if (s->packet_size > 0)
+        pos = (pos + s->packet_size - 1 - s->internal->data_offset) /
+              s->packet_size * s->packet_size +
+              s->internal->data_offset;
+    *ppos = pos;
+    if (avio_seek(s->pb, pos, SEEK_SET) < 0)
+        return AV_NOPTS_VALUE;
+
+    ff_read_frame_flush(s);
+    asf_reset_header(s);
+    for (;;) {
+        if (av_read_frame(s, pkt) < 0) {
+            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
+            return AV_NOPTS_VALUE;
+        }
+
+        pts = pkt->dts;
+
+        av_free_packet(pkt);
+        if (pkt->flags & AV_PKT_FLAG_KEY) {
+            i = pkt->stream_index;
+
+            asf_st = &asf->streams[s->streams[i]->id];
+
+//            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
+            pos = asf_st->packet_pos;
+
+            av_add_index_entry(s->streams[i], pos, pts, pkt->size,
+                               pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
+            start_pos[i] = asf_st->packet_pos + 1;
+
+            if (pkt->stream_index == stream_index)
+                break;
+        }
+    }
+
+    *ppos = pos;
+    return pts;
+}
+
+static int asf_build_simple_index(AVFormatContext *s, int stream_index)
+{
+    ff_asf_guid g;
+    ASFContext *asf     = s->priv_data;
+    int64_t current_pos = avio_tell(s->pb);
+    int64_t ret;
+
+    if((ret = avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET)) < 0) {
+        return ret;
+    }
+
+    if ((ret = ff_get_guid(s->pb, &g)) < 0)
+        goto end;
+
+    /* the data object can be followed by other top-level objects,
+     * skip them until the simple index object is reached */
+    while (ff_guidcmp(&g, &ff_asf_simple_index_header)) {
+        int64_t gsize = avio_rl64(s->pb);
+        if (gsize < 24 || avio_feof(s->pb)) {
+            goto end;
+        }
+        avio_skip(s->pb, gsize - 24);
+        if ((ret = ff_get_guid(s->pb, &g)) < 0)
+            goto end;
+    }
+
+    {
+        int64_t itime, last_pos = -1;
+        int pct, ict;
+        int i;
+        int64_t av_unused gsize = avio_rl64(s->pb);
+        if ((ret = ff_get_guid(s->pb, &g)) < 0)
+            goto end;
+        itime = avio_rl64(s->pb);
+        pct   = avio_rl32(s->pb);
+        ict   = avio_rl32(s->pb);
+        av_log(s, AV_LOG_DEBUG,
+               "itime:0x%"PRIx64", pct:%d, ict:%d\n", itime, pct, ict);
+
+        for (i = 0; i < ict; i++) {
+            int pktnum        = avio_rl32(s->pb);
+            int pktct         = avio_rl16(s->pb);
+            int64_t pos       = s->internal->data_offset + s->packet_size * (int64_t)pktnum;
+            int64_t index_pts = FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
+
+            if (pos != last_pos) {
+                av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n",
+                       pktnum, pktct, index_pts);
+                av_add_index_entry(s->streams[stream_index], pos, index_pts,
+                                   s->packet_size, 0, AVINDEX_KEYFRAME);
+                last_pos = pos;
+            }
+        }
+        asf->index_read = ict > 1;
+    }
+end:
+//     if (avio_feof(s->pb)) {
+//         ret = 0;
+//     }
+    avio_seek(s->pb, current_pos, SEEK_SET);
+    return ret;
+}
+
+static int asf_read_seek(AVFormatContext *s, int stream_index,
+                         int64_t pts, int flags)
+{
+    ASFContext *asf = s->priv_data;
+    AVStream *st    = s->streams[stream_index];
+    int ret = 0;
+
+    if (s->packet_size <= 0)
+        return -1;
+
+    /* Try using the protocol's read_seek if available */
+    if (s->pb) {
+        int64_t ret = avio_seek_time(s->pb, stream_index, pts, flags);
+        if (ret >= 0)
+            asf_reset_header(s);
+        if (ret != AVERROR(ENOSYS))
+            return ret;
+    }
+
+    /* explicitly handle the case of seeking to 0 */
+    if (!pts) {
+        asf_reset_header(s);
+        avio_seek(s->pb, s->internal->data_offset, SEEK_SET);
+        return 0;
+    }
+
+    if (!asf->index_read) {
+        ret = asf_build_simple_index(s, stream_index);
+        if (ret < 0)
+            asf->index_read = -1;
+    }
+
+    if (asf->index_read > 0 && st->index_entries) {
+        int index = av_index_search_timestamp(st, pts, flags);
+        if (index >= 0) {
+            /* find the position */
+            uint64_t pos = st->index_entries[index].pos;
+
+            /* do the seek */
+            av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
+            if(avio_seek(s->pb, pos, SEEK_SET) < 0)
+                return -1;
+            asf_reset_header(s);
+            skip_to_key(s);
+            return 0;
+        }
+    }
+    /* no index or seeking by index failed */
+    if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
+        return -1;
+    asf_reset_header(s);
+    skip_to_key(s);
+    return 0;
+}
+
+AVInputFormat ff_asf_demuxer = {
+    .name           = "asf",
+    .long_name      = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
+    .priv_data_size = sizeof(ASFContext),
+    .read_probe     = asf_probe,
+    .read_header    = asf_read_header,
+    .read_packet    = asf_read_packet,
+    .read_close     = asf_read_close,
+    .read_seek      = asf_read_seek,
+    .read_timestamp = asf_read_pts,
+    .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
+    .priv_class     = &asf_class,
+};