IFF demuxer
Patch by Jai Menon (realityman <at> gmx.net) Originally committed as revision 12633 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Jai Menon
Vitor Sessak
parent
cb21e0a715
commit
3a027f5e66
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@ -63,6 +63,7 @@ OBJS-$(CONFIG_H263_MUXER) += raw.o
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OBJS-$(CONFIG_H264_DEMUXER) += raw.o
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OBJS-$(CONFIG_H264_MUXER) += raw.o
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OBJS-$(CONFIG_IDCIN_DEMUXER) += idcin.o
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OBJS-$(CONFIG_IFF_DEMUXER) += iff.o
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OBJS-$(CONFIG_IMAGE2_DEMUXER) += img2.o
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OBJS-$(CONFIG_IMAGE2_MUXER) += img2.o
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OBJS-$(CONFIG_IMAGE2PIPE_DEMUXER) += img2.o
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@ -86,6 +86,7 @@ void av_register_all(void)
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REGISTER_MUXDEMUX (H263, h263);
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REGISTER_MUXDEMUX (H264, h264);
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REGISTER_DEMUXER (IDCIN, idcin);
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REGISTER_DEMUXER (IFF, iff);
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REGISTER_MUXDEMUX (IMAGE2, image2);
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REGISTER_MUXDEMUX (IMAGE2PIPE, image2pipe);
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REGISTER_DEMUXER (INGENIENT, ingenient);
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@ -22,7 +22,7 @@
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#define FFMPEG_AVFORMAT_H
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#define LIBAVFORMAT_VERSION_MAJOR 52
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#define LIBAVFORMAT_VERSION_MINOR 12
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#define LIBAVFORMAT_VERSION_MINOR 13
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#define LIBAVFORMAT_VERSION_MICRO 0
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#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
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174
libavformat/iff.c
Normal file
174
libavformat/iff.c
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@ -0,0 +1,174 @@
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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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