0ebd83617f
* qatar/master: (27 commits)
avconv: free packet in write_frame() when discarding due to frame number limit
FATE: use +/- flag option syntax for vp8 emu-edge tests
lavf: make av_interleave_packet_per_dts() private.
lavf: deprecate av_read_packet().
oggdec: output correct timestamps for Vorbis
avconv: pass input stream timestamps to audio encoders
lavc: shrink encoded audio packet size after encoding.
xa: set correct bit rate
xa: do not set bit_rate, block_align, or bits_per_coded_sample
xa: fix end-of-file handling
xa: fix timestamp calculation
bink: fix typo in FFALIGN() argument
bink: align plane width to 8 when calculating bundle sizes
doc: pass -Idoc texi2html and texi2pod
doc: texi2pod: add -I flag
movenc: Add a min_frag_duration option
rtsp: Set the default delay to 0.1 s for the RTSP/SDP/RTP demuxers
libavformat: Set the default for the max_delay option to -1
Generate manpages for AV{Format,Codec}Context AVOptions.
doc/avconv: remove entries for AVOptions.
...
Conflicts:
doc/Makefile
doc/ffmpeg.texi
doc/muxers.texi
ffmpeg.c
libavcodec/Makefile
libavcodec/options.c
libavcodec/vp8.c
libavformat/options.c
tests/fate/demux.mak
tests/ref/fate/truemotion1-15
tests/ref/fate/truemotion1-24
Merged-by: Michael Niedermayer <michaelni@gmx.at>
129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/*
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* Maxis XA (.xa) File Demuxer
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* Copyright (c) 2008 Robert Marston
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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
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* Maxis XA File Demuxer
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* by Robert Marston (rmarston@gmail.com)
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* for more information on the XA audio format see
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* http://wiki.multimedia.cx/index.php?title=Maxis_XA
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*/
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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#define XA00_TAG MKTAG('X', 'A', 0, 0)
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#define XAI0_TAG MKTAG('X', 'A', 'I', 0)
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#define XAJ0_TAG MKTAG('X', 'A', 'J', 0)
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typedef struct MaxisXADemuxContext {
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uint32_t out_size;
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uint32_t sent_bytes;
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} MaxisXADemuxContext;
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static int xa_probe(AVProbeData *p)
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{
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int channels, srate, bits_per_sample;
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if (p->buf_size < 24)
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return 0;
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switch(AV_RL32(p->buf)) {
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case XA00_TAG:
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case XAI0_TAG:
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case XAJ0_TAG:
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break;
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default:
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return 0;
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}
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channels = AV_RL16(p->buf + 10);
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srate = AV_RL32(p->buf + 12);
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bits_per_sample = AV_RL16(p->buf + 22);
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if (!channels || channels > 8 || !srate || srate > 192000 ||
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bits_per_sample < 4 || bits_per_sample > 32)
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return 0;
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return AVPROBE_SCORE_MAX/2;
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}
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static int xa_read_header(AVFormatContext *s)
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{
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MaxisXADemuxContext *xa = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st;
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/*Set up the XA Audio Decoder*/
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_ADPCM_EA_MAXIS_XA;
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avio_skip(pb, 4); /* Skip the XA ID */
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xa->out_size = avio_rl32(pb);
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avio_skip(pb, 2); /* Skip the tag */
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st->codec->channels = avio_rl16(pb);
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st->codec->sample_rate = avio_rl32(pb);
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avio_skip(pb, 4); /* Skip average byte rate */
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avio_skip(pb, 2); /* Skip block align */
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avio_skip(pb, 2); /* Skip bits-per-sample */
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st->codec->bit_rate = av_clip(15LL * st->codec->channels * 8 *
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st->codec->sample_rate / 28, 0, INT_MAX);
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
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st->start_time = 0;
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return 0;
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}
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static int xa_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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MaxisXADemuxContext *xa = s->priv_data;
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AVStream *st = s->streams[0];
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AVIOContext *pb = s->pb;
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unsigned int packet_size;
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int ret;
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if (xa->sent_bytes >= xa->out_size)
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return AVERROR_EOF;
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/* 1 byte header and 14 bytes worth of samples * number channels per block */
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packet_size = 15*st->codec->channels;
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ret = av_get_packet(pb, pkt, packet_size);
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if(ret < 0)
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return ret;
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pkt->stream_index = st->index;
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xa->sent_bytes += packet_size;
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pkt->duration = 28;
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return ret;
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}
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AVInputFormat ff_xa_demuxer = {
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.name = "xa",
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.long_name = NULL_IF_CONFIG_SMALL("Maxis XA File Format"),
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.priv_data_size = sizeof(MaxisXADemuxContext),
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.read_probe = xa_probe,
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.read_header = xa_read_header,
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.read_packet = xa_read_packet,
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};
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