diff options
Diffstat (limited to 'libavformat/iff.c')
-rw-r--r-- | libavformat/iff.c | 160 |
1 files changed, 92 insertions, 68 deletions
diff --git a/libavformat/iff.c b/libavformat/iff.c index 2b84986..db988a6 100644 --- a/libavformat/iff.c +++ b/libavformat/iff.c @@ -1,23 +1,22 @@ /* - * IFF (.iff) file demuxer * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net> * Copyright (c) 2010 Peter Ross <pross@xvid.org> * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com> * - * 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 */ @@ -29,6 +28,7 @@ * http://wiki.multimedia.cx/index.php?title=IFF */ +#include "libavcodec/bytestream.h" #include "libavutil/intreadwrite.h" #include "libavutil/dict.h" #include "avformat.h" @@ -41,6 +41,7 @@ #define ID_PBM MKTAG('P','B','M',' ') #define ID_ILBM MKTAG('I','L','B','M') #define ID_BMHD MKTAG('B','M','H','D') +#define ID_CAMG MKTAG('C','A','M','G') #define ID_CMAP MKTAG('C','M','A','P') #define ID_FORM MKTAG('F','O','R','M') @@ -59,7 +60,15 @@ #define RIGHT 4 #define STEREO 6 -#define PACKET_SIZE 1024 +/** + * This number of bytes if added at the beginning of each AVPacket + * which contain additional information about video properties + * which has to be shared between demuxer and decoder. + * This number may change between frames, e.g. the demuxer might + * set it to smallest possible size of 2 to indicate that there's + * no extradata changing in this frame. + */ +#define IFF_EXTRA_VIDEO_SIZE 9 typedef enum { COMP_NONE, @@ -77,21 +86,15 @@ typedef struct { uint32_t body_size; uint32_t sent_bytes; uint32_t audio_frame_count; + svx8_compression_type svx8_compression; + bitmap_compression_type bitmap_compression; ///< delta compression method used + unsigned bpp; ///< bits per plane to decode (differs from bits_per_coded_sample if HAM) + unsigned ham; ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise) + unsigned flags; ///< 1 for EHB, 0 is no extra half darkening + unsigned transparency; ///< transparency color index in palette + unsigned masking; ///< masking method used } IffDemuxContext; - -static void interleave_stereo(const uint8_t *src, uint8_t *dest, int size) -{ - uint8_t *end = dest + size; - size = size>>1; - - while(dest < end) { - *dest++ = *src; - *dest++ = *(src+size); - src++; - } -} - /* Metadata string read */ static int get_metadata(AVFormatContext *s, const char *const tag, @@ -127,8 +130,11 @@ static int iff_read_header(AVFormatContext *s, IffDemuxContext *iff = s->priv_data; AVIOContext *pb = s->pb; AVStream *st; + uint8_t *buf; uint32_t chunk_id, data_size; - int compression = -1; + uint32_t screenmode = 0; + unsigned transparency = 0; + unsigned masking = 0; // no mask st = av_new_stream(s, 0); if (!st) @@ -139,7 +145,7 @@ static int iff_read_header(AVFormatContext *s, // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content st->codec->codec_tag = avio_rl32(pb); - while(!pb->eof_reached) { + while(!url_feof(pb)) { uint64_t orig_pos; int res; const char *metadata_tag = NULL; @@ -157,7 +163,7 @@ static int iff_read_header(AVFormatContext *s, st->codec->sample_rate = avio_rb16(pb); if (data_size >= 16) { avio_skip(pb, 1); - compression = avio_r8(pb); + iff->svx8_compression = avio_r8(pb); } break; @@ -172,16 +178,23 @@ static int iff_read_header(AVFormatContext *s, st->codec->channels = (avio_rb32(pb) < 6) ? 1 : 2; break; + case ID_CAMG: + if (data_size < 4) + return AVERROR_INVALIDDATA; + screenmode = avio_rb32(pb); + break; + case ID_CMAP: - st->codec->extradata_size = data_size; - st->codec->extradata = av_malloc(data_size); + st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE; + st->codec->extradata = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE); if (!st->codec->extradata) return AVERROR(ENOMEM); - if (avio_read(pb, st->codec->extradata, data_size) < 0) + if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0) return AVERROR(EIO); break; case ID_BMHD: + iff->bitmap_compression = -1; st->codec->codec_type = AVMEDIA_TYPE_VIDEO; if (data_size <= 8) return AVERROR_INVALIDDATA; @@ -189,33 +202,25 @@ static int iff_read_header(AVFormatContext *s, st->codec->height = avio_rb16(pb); avio_skip(pb, 4); // x, y offset st->codec->bits_per_coded_sample = avio_r8(pb); - if (data_size >= 11) { - avio_skip(pb, 1); // masking - compression = avio_r8(pb); + if (data_size >= 10) + masking = avio_r8(pb); + if (data_size >= 11) + iff->bitmap_compression = avio_r8(pb); + if (data_size >= 14) { + avio_skip(pb, 1); // padding + transparency = avio_rb16(pb); } if (data_size >= 16) { - avio_skip(pb, 3); // paddding, transparent st->sample_aspect_ratio.num = avio_r8(pb); st->sample_aspect_ratio.den = avio_r8(pb); } break; case ID_ANNO: - case ID_TEXT: - metadata_tag = "comment"; - break; - - case ID_AUTH: - metadata_tag = "artist"; - break; - - case ID_COPYRIGHT: - metadata_tag = "copyright"; - break; - - case ID_NAME: - metadata_tag = "title"; - break; + case ID_TEXT: metadata_tag = "comment"; break; + case ID_AUTH: metadata_tag = "artist"; break; + case ID_COPYRIGHT: metadata_tag = "copyright"; break; + case ID_NAME: metadata_tag = "title"; break; } if (metadata_tag) { @@ -233,9 +238,9 @@ static int iff_read_header(AVFormatContext *s, case AVMEDIA_TYPE_AUDIO: av_set_pts_info(st, 32, 1, st->codec->sample_rate); - switch(compression) { + switch (iff->svx8_compression) { case COMP_NONE: - st->codec->codec_id = CODEC_ID_PCM_S8; + st->codec->codec_id = CODEC_ID_8SVX_RAW; break; case COMP_FIB: st->codec->codec_id = CODEC_ID_8SVX_FIB; @@ -244,17 +249,42 @@ static int iff_read_header(AVFormatContext *s, st->codec->codec_id = CODEC_ID_8SVX_EXP; break; default: - av_log(s, AV_LOG_ERROR, "unknown compression method\n"); + av_log(s, AV_LOG_ERROR, + "Unknown SVX8 compression method '%d'\n", iff->svx8_compression); return -1; } - st->codec->bits_per_coded_sample = 8; + st->codec->bits_per_coded_sample = iff->svx8_compression == COMP_NONE ? 8 : 4; st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample; st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample; break; case AVMEDIA_TYPE_VIDEO: - switch (compression) { + iff->bpp = st->codec->bits_per_coded_sample; + if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) { + iff->ham = iff->bpp > 6 ? 6 : 4; + st->codec->bits_per_coded_sample = 24; + } + iff->flags = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8; + iff->masking = masking; + iff->transparency = transparency; + + if (!st->codec->extradata) { + st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE; + st->codec->extradata = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE); + if (!st->codec->extradata) + return AVERROR(ENOMEM); + } + buf = st->codec->extradata; + bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE); + bytestream_put_byte(&buf, iff->bitmap_compression); + bytestream_put_byte(&buf, iff->bpp); + bytestream_put_byte(&buf, iff->ham); + bytestream_put_byte(&buf, iff->flags); + bytestream_put_be16(&buf, iff->transparency); + bytestream_put_byte(&buf, iff->masking); + + switch (iff->bitmap_compression) { case BITMAP_RAW: st->codec->codec_id = CODEC_ID_IFF_ILBM; break; @@ -262,7 +292,8 @@ static int iff_read_header(AVFormatContext *s, st->codec->codec_id = CODEC_ID_IFF_BYTERUN1; break; default: - av_log(s, AV_LOG_ERROR, "unknown compression method\n"); + av_log(s, AV_LOG_ERROR, + "Unknown bitmap compression method '%d'\n", iff->bitmap_compression); return AVERROR_INVALIDDATA; } break; @@ -284,34 +315,27 @@ static int iff_read_packet(AVFormatContext *s, if(iff->sent_bytes >= iff->body_size) return AVERROR(EIO); - if(st->codec->channels == 2) { - uint8_t sample_buffer[PACKET_SIZE]; + if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { + ret = av_get_packet(pb, pkt, iff->body_size); + } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { + uint8_t *buf; - ret = avio_read(pb, sample_buffer, PACKET_SIZE); - if(av_new_packet(pkt, PACKET_SIZE) < 0) { - av_log(s, AV_LOG_ERROR, "cannot allocate packet\n"); + if (av_new_packet(pkt, iff->body_size + 2) < 0) { return AVERROR(ENOMEM); } - interleave_stereo(sample_buffer, pkt->data, PACKET_SIZE); - } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { - ret = av_get_packet(pb, pkt, iff->body_size); + + buf = pkt->data; + bytestream_put_be16(&buf, 2); + ret = avio_read(pb, buf, iff->body_size); } else { - ret = av_get_packet(pb, pkt, PACKET_SIZE); + av_abort(); } if(iff->sent_bytes == 0) pkt->flags |= AV_PKT_FLAG_KEY; + iff->sent_bytes = iff->body_size; - if(st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { - iff->sent_bytes += PACKET_SIZE; - } else { - iff->sent_bytes = iff->body_size; - } pkt->stream_index = 0; - if(st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { - pkt->pts = iff->audio_frame_count; - iff->audio_frame_count += ret / st->codec->channels; - } return ret; } |