mirror of https://github.com/FFmpeg/FFmpeg.git
Patch by Jai Menon (realityman <at> gmx.net) Originally committed as revision 12633 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
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cb21e0a715
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3a027f5e66
4 changed files with 177 additions and 1 deletions
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/*
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* Iff (.iff) File Demuxer |
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* Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file iff.c |
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* iff file demuxer |
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* by Jaikrishnan Menon |
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* for more information on the .iff file format, visit: |
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* http://wiki.multimedia.cx/index.php?title=IFF
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*/ |
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#include "avformat.h" |
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#define ID_8SVX MKTAG('8','S','V','X') |
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#define ID_VHDR MKTAG('V','H','D','R') |
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#define ID_ATAK MKTAG('A','T','A','K') |
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#define ID_RLSE MKTAG('R','L','S','E') |
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#define ID_CHAN MKTAG('C','H','A','N') |
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#define ID_FORM MKTAG('F','O','R','M') |
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#define ID_ANNO MKTAG('A','N','N','O') |
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#define ID_AUTH MKTAG('A','U','T','H') |
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#define ID_CHRS MKTAG('C','H','R','S') |
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#define ID_COPYRIGHT MKTAG('(','c',')',' ') |
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#define ID_CSET MKTAG('C','S','E','T') |
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#define ID_FVER MKTAG('F','V','E','R') |
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#define ID_NAME MKTAG('N','A','M','E') |
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#define ID_TEXT MKTAG('T','E','X','T') |
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#define ID_BODY MKTAG('B','O','D','Y') |
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#define LEFT 2 |
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#define RIGHT 4 |
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#define STEREO 6 |
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#define PACKET_SIZE 1024 |
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typedef enum {COMP_NONE, COMP_FIB, COMP_EXP} svx8_compression_t; |
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typedef struct { |
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uint32_t body_size; |
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uint32_t sent_bytes; |
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uint32_t audio_frame_count; |
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} IffDemuxContext; |
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static int iff_probe(AVProbeData *p) |
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{ |
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const uint8_t *d = p->buf; |
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if ( AV_RL32(d) == ID_FORM && |
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AV_RL32(d+8) == ID_8SVX) |
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return AVPROBE_SCORE_MAX; |
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return 0; |
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} |
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static int iff_read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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IffDemuxContext *iff = s->priv_data; |
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ByteIOContext *pb = s->pb; |
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AVStream *st; |
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uint32_t chunk_id, data_size; |
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int padding, ret, done = 0; |
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st = av_new_stream(s, 0); |
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if (!st) |
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return AVERROR(ENOMEM); |
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st->codec->channels = 1; |
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url_fskip(pb, 12); |
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while(!done && !url_feof(pb)) { |
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chunk_id = get_le32(pb); |
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data_size = get_be32(pb); |
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padding = data_size & 1; |
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switch(chunk_id) { |
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case ID_VHDR: |
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url_fskip(pb, 12); |
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st->codec->sample_rate = get_be16(pb); |
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url_fskip(pb, 1); |
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st->codec->codec_tag = get_byte(pb); |
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url_fskip(pb, 4); |
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break; |
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case ID_BODY: |
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iff->body_size = data_size; |
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done = 1; |
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break; |
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case ID_CHAN: |
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st->codec->channels = (get_be32(pb) < 6) ? 1 : 2; |
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break; |
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default: |
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url_fseek(pb, data_size + padding, SEEK_CUR); |
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break; |
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} |
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} |
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if(!st->codec->sample_rate) |
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return AVERROR_INVALIDDATA; |
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av_set_pts_info(st, 32, 1, st->codec->sample_rate); |
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st->codec->codec_type = CODEC_TYPE_AUDIO; |
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switch(st->codec->codec_tag) { |
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case COMP_NONE: |
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st->codec->codec_id = CODEC_ID_PCM_S8; |
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break; |
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case COMP_FIB: |
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st->codec->codec_id = CODEC_ID_8SVX_FIB; |
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break; |
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case COMP_EXP: |
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st->codec->codec_id = CODEC_ID_8SVX_EXP; |
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break; |
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default: |
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av_log(s, AV_LOG_ERROR, "iff: unknown compression method\n"); |
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return -1; |
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} |
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st->codec->bits_per_sample = 8; |
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st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_sample; |
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st->codec->block_align = st->codec->channels * st->codec->bits_per_sample; |
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return 0; |
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} |
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static int iff_read_packet(AVFormatContext *s, |
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AVPacket *pkt) |
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{ |
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IffDemuxContext *iff = s->priv_data; |
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ByteIOContext *pb = s->pb; |
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int ret; |
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if(iff->sent_bytes > iff->body_size) |
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return AVERROR(EIO); |
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ret = av_get_packet(pb, pkt, PACKET_SIZE); |
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if(iff->sent_bytes == 0) |
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pkt->flags |= PKT_FLAG_KEY; |
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iff->sent_bytes += PACKET_SIZE; |
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pkt->stream_index = 0; |
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pkt->pts = iff->audio_frame_count; |
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iff->audio_frame_count += ret / s->streams[0]->codec->channels; |
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return ret; |
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} |
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AVInputFormat iff_demuxer = { |
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"IFF", |
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"IFF format", |
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sizeof(IffDemuxContext), |
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iff_probe, |
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iff_read_header, |
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iff_read_packet, |
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}; |
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