diff options
Diffstat (limited to 'libavformat/swfdec.c')
-rw-r--r-- | libavformat/swfdec.c | 134 |
1 files changed, 120 insertions, 14 deletions
diff --git a/libavformat/swfdec.c b/libavformat/swfdec.c index ff44452..e8ab718 100644 --- a/libavformat/swfdec.c +++ b/libavformat/swfdec.c @@ -3,20 +3,20 @@ * Copyright (c) 2000 Fabrice Bellard * Copyright (c) 2003 Tinic Uro * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -36,8 +36,8 @@ static int get_swf_tag(AVIOContext *pb, int *len_ptr) { int tag, len; - if (pb->eof_reached) - return -1; + if (url_feof(pb)) + return AVERROR_EOF; tag = avio_rl16(pb); len = tag & 0x3f; @@ -60,6 +60,39 @@ static int swf_probe(AVProbeData *p) return 0; } +#if CONFIG_ZLIB +static int zlib_refill(void *opaque, uint8_t *buf, int buf_size) +{ + AVFormatContext *s = opaque; + SWFContext *swf = s->priv_data; + z_stream *z = &swf->zstream; + int ret; + +retry: + if (!z->avail_in) { + int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE); + if (n < 0) + return n; + z->next_in = swf->zbuf_in; + z->avail_in = n; + } + + z->next_out = buf; + z->avail_out = buf_size; + + ret = inflate(z, Z_NO_FLUSH); + if (ret < 0) + return AVERROR(EINVAL); + if (ret == Z_STREAM_END) + return AVERROR_EOF; + + if (buf_size - z->avail_out == 0) + goto retry; + + return buf_size - z->avail_out; +} +#endif + static int swf_read_header(AVFormatContext *s) { SWFContext *swf = s->priv_data; @@ -67,14 +100,29 @@ static int swf_read_header(AVFormatContext *s) int nbits, len, tag; tag = avio_rb32(pb) & 0xffffff00; + avio_rl32(pb); if (tag == MKBETAG('C', 'W', 'S', 0)) { - av_log(s, AV_LOG_ERROR, "Compressed SWF format not supported\n"); + av_log(s, AV_LOG_INFO, "SWF compressed file detected\n"); +#if CONFIG_ZLIB + swf->zbuf_in = av_malloc(ZBUF_SIZE); + swf->zbuf_out = av_malloc(ZBUF_SIZE); + swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s, + zlib_refill, NULL, NULL); + if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb) + return AVERROR(ENOMEM); + swf->zpb->seekable = 0; + if (inflateInit(&swf->zstream) != Z_OK) { + av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n"); + return AVERROR(EINVAL); + } + pb = swf->zpb; +#else + av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n"); return AVERROR(EIO); - } - if (tag != MKBETAG('F', 'W', 'S', 0)) +#endif + } else if (tag != MKBETAG('F', 'W', 'S', 0)) return AVERROR(EIO); - avio_rl32(pb); /* skip rectangle size */ nbits = avio_r8(pb) >> 3; len = (4 * nbits - 3 + 7) / 8; @@ -94,11 +142,16 @@ static int swf_read_packet(AVFormatContext *s, AVPacket *pkt) AVStream *vst = NULL, *ast = NULL, *st = 0; int tag, len, i, frame, v, res; +#if CONFIG_ZLIB + if (swf->zpb) + pb = swf->zpb; +#endif + for(;;) { uint64_t pos = avio_tell(pb); tag = get_swf_tag(pb, &len); if (tag < 0) - return AVERROR(EIO); + return tag; if (tag == TAG_VIDEOSTREAM) { int ch_id = avio_rl16(pb); len -= 2; @@ -116,7 +169,7 @@ static int swf_read_packet(AVFormatContext *s, AVPacket *pkt) /* Check for FLV1 */ vst = avformat_new_stream(s, NULL); if (!vst) - return -1; + return AVERROR(ENOMEM); vst->id = ch_id; vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb)); @@ -137,7 +190,7 @@ static int swf_read_packet(AVFormatContext *s, AVPacket *pkt) swf->samples_per_frame = avio_rl16(pb); ast = avformat_new_stream(s, NULL); if (!ast) - return -1; + return AVERROR(ENOMEM); ast->id = -1; /* -1 to avoid clash with video stream ch_id */ ast->codec->channels = 1 + (v&1); ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; @@ -147,6 +200,44 @@ static int swf_read_packet(AVFormatContext *s, AVPacket *pkt) ast->codec->sample_rate = 44100 >> (3 - sample_rate_code); avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); len -= 4; + } else if (tag == TAG_DEFINESOUND) { + /* audio stream */ + int sample_rate_code; + int ch_id = avio_rl16(pb); + + for (i=0; i<s->nb_streams; i++) { + st = s->streams[i]; + if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id) + goto skip; + } + + // FIXME: 8-bit uncompressed PCM audio will be interpreted as 16-bit + // FIXME: The entire audio stream is stored in a single chunk/tag. Normally, + // these are smaller audio streams in DEFINESOUND tags, but it's technically + // possible they could be huge. Break it up into multiple packets if it's big. + v = avio_r8(pb); + ast = avformat_new_stream(s, NULL); + if (!ast) + return AVERROR(ENOMEM); + ast->id = ch_id; + ast->codec->channels = 1 + (v&1); + ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; + ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, (v>>4) & 15); + ast->need_parsing = AVSTREAM_PARSE_FULL; + sample_rate_code= (v>>2) & 3; + ast->codec->sample_rate = 44100 >> (3 - sample_rate_code); + avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); + ast->duration = avio_rl32(pb); // number of samples + if (((v>>4) & 15) == 2) { // MP3 sound data record + ast->skip_samples = avio_rl16(pb); + len -= 2; + } + len -= 7; + if ((res = av_get_packet(pb, pkt, len)) < 0) + return res; + pkt->pos = pos; + pkt->stream_index = ast->index; + return pkt->size; } else if (tag == TAG_VIDEOFRAME) { int ch_id = avio_rl16(pb); len -= 2; @@ -188,7 +279,7 @@ static int swf_read_packet(AVFormatContext *s, AVPacket *pkt) if (i == s->nb_streams) { vst = avformat_new_stream(s, NULL); if (!vst) - return -1; + return AVERROR(ENOMEM); vst->id = -2; /* -2 to avoid clash with video stream and audio stream */ vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; vst->codec->codec_id = AV_CODEC_ID_MJPEG; @@ -217,6 +308,18 @@ static int swf_read_packet(AVFormatContext *s, AVPacket *pkt) } } +#if CONFIG_ZLIB +static av_cold int swf_read_close(AVFormatContext *avctx) +{ + SWFContext *s = avctx->priv_data; + inflateEnd(&s->zstream); + av_freep(&s->zbuf_in); + av_freep(&s->zbuf_out); + av_freep(&s->zpb); + return 0; +} +#endif + AVInputFormat ff_swf_demuxer = { .name = "swf", .long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"), @@ -224,4 +327,7 @@ AVInputFormat ff_swf_demuxer = { .read_probe = swf_probe, .read_header = swf_read_header, .read_packet = swf_read_packet, +#if CONFIG_ZLIB + .read_close = swf_read_close, +#endif }; |