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ffmpeg/libavformat/mmf.c

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/*
* Yamaha SMAF format
* Copyright (c) 2005 Vidar Madsen
*
* This file is part of Libav.
*
* Libav 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,
* 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
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/channel_layout.h"
#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"
#include "pcm.h"
#include "riff.h"
typedef struct {
int64_t atrpos, atsqpos, awapos;
int64_t data_size;
} MMFContext;
static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };
static int mmf_rate(int code)
{
if((code < 0) || (code > 4))
return -1;
return mmf_rates[code];
}
#if CONFIG_MMF_MUXER
static int mmf_rate_code(int rate)
{
int i;
for(i = 0; i < 5; i++)
if(mmf_rates[i] == rate)
return i;
return -1;
}
/* Copy of end_tag() from avienc.c, but for big-endian chunk size */
static void end_tag_be(AVIOContext *pb, int64_t start)
{
int64_t pos;
pos = avio_tell(pb);
avio_seek(pb, start - 4, SEEK_SET);
avio_wb32(pb, (uint32_t)(pos - start));
avio_seek(pb, pos, SEEK_SET);
}
static int mmf_write_header(AVFormatContext *s)
{
MMFContext *mmf = s->priv_data;
AVIOContext *pb = s->pb;
int64_t pos;
int rate;
rate = mmf_rate_code(s->streams[0]->codec->sample_rate);
if(rate < 0) {
av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d\n", s->streams[0]->codec->sample_rate);
return -1;
}
ffio_wfourcc(pb, "MMMD");
avio_wb32(pb, 0);
pos = ff_start_tag(pb, "CNTI");
avio_w8(pb, 0); /* class */
avio_w8(pb, 0); /* type */
avio_w8(pb, 0); /* code type */
avio_w8(pb, 0); /* status */
avio_w8(pb, 0); /* counts */
avio_write(pb, "VN:libavcodec,", sizeof("VN:libavcodec,") -1); /* metadata ("ST:songtitle,VN:version,...") */
end_tag_be(pb, pos);
avio_write(pb, "ATR\x00", 4);
avio_wb32(pb, 0);
mmf->atrpos = avio_tell(pb);
avio_w8(pb, 0); /* format type */
avio_w8(pb, 0); /* sequence type */
avio_w8(pb, (0 << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */
avio_w8(pb, 0); /* wave base bit */
avio_w8(pb, 2); /* time base d */
avio_w8(pb, 2); /* time base g */
ffio_wfourcc(pb, "Atsq");
avio_wb32(pb, 16);
mmf->atsqpos = avio_tell(pb);
/* Will be filled on close */
avio_write(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
mmf->awapos = ff_start_tag(pb, "Awa\x01");
avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
avio_flush(pb);
return 0;
}
static int mmf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVIOContext *pb = s->pb;
avio_write(pb, pkt->data, pkt->size);
return 0;
}
/* Write a variable-length symbol */
static void put_varlength(AVIOContext *pb, int val)
{
if(val < 128)
avio_w8(pb, val);
else {
val -= 128;
avio_w8(pb, 0x80 | val >> 7);
avio_w8(pb, 0x7f & val);
}
}
static int mmf_write_trailer(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
MMFContext *mmf = s->priv_data;
int64_t pos, size;
int gatetime;
if (s->pb->seekable) {
/* Fill in length fields */
end_tag_be(pb, mmf->awapos);
end_tag_be(pb, mmf->atrpos);
end_tag_be(pb, 8);
pos = avio_tell(pb);
size = pos - mmf->awapos;
/* Fill Atsq chunk */
avio_seek(pb, mmf->atsqpos, SEEK_SET);
/* "play wav" */
avio_w8(pb, 0); /* start time */
avio_w8(pb, 1); /* (channel << 6) | wavenum */
gatetime = size * 500 / s->streams[0]->codec->sample_rate;
put_varlength(pb, gatetime); /* duration */
/* "nop" */
put_varlength(pb, gatetime); /* start time */
avio_write(pb, "\xff\x00", 2); /* nop */
/* "end of sequence" */
avio_write(pb, "\x00\x00\x00\x00", 4);
avio_seek(pb, pos, SEEK_SET);
avio_flush(pb);
}
return 0;
}
#endif /* CONFIG_MMF_MUXER */
static int mmf_probe(AVProbeData *p)
{
/* check file header */
if (p->buf[0] == 'M' && p->buf[1] == 'M' &&
p->buf[2] == 'M' && p->buf[3] == 'D' &&
p->buf[8] == 'C' && p->buf[9] == 'N' &&
p->buf[10] == 'T' && p->buf[11] == 'I')
return AVPROBE_SCORE_MAX;
else
return 0;
}
/* mmf input */
static int mmf_read_header(AVFormatContext *s)
{
MMFContext *mmf = s->priv_data;
unsigned int tag;
AVIOContext *pb = s->pb;
AVStream *st;
int64_t size;
int rate, params;
tag = avio_rl32(pb);
if (tag != MKTAG('M', 'M', 'M', 'D'))
return -1;
avio_skip(pb, 4); /* file_size */
/* Skip some unused chunks that may or may not be present */
for(;; avio_skip(pb, size)) {
tag = avio_rl32(pb);
size = avio_rb32(pb);
if(tag == MKTAG('C','N','T','I')) continue;
if(tag == MKTAG('O','P','D','A')) continue;
break;
}
/* Tag = "ATRx", where "x" = track number */
if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) {
av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n");
return -1;
}
if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
return -1;
}
avio_r8(pb); /* format type */
avio_r8(pb); /* sequence type */
params = avio_r8(pb); /* (channel << 7) | (format << 4) | rate */
rate = mmf_rate(params & 0x0f);
if(rate < 0) {
av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
return -1;
}
avio_r8(pb); /* wave base bit */
avio_r8(pb); /* time base d */
avio_r8(pb); /* time base g */
/* Skip some unused chunks that may or may not be present */
for(;; avio_skip(pb, size)) {
tag = avio_rl32(pb);
size = avio_rb32(pb);
if(tag == MKTAG('A','t','s','q')) continue;
if(tag == MKTAG('A','s','p','I')) continue;
break;
}
/* Make sure it's followed by an Awa chunk, aka wave data */
if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) {
av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag);
return -1;
}
mmf->data_size = size;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = AV_CODEC_ID_ADPCM_YAMAHA;
st->codec->sample_rate = rate;
st->codec->channels = 1;
st->codec->channel_layout = AV_CH_LAYOUT_MONO;
st->codec->bits_per_coded_sample = 4;
st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample;
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
return 0;
}
#define MAX_SIZE 4096
static int mmf_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
MMFContext *mmf = s->priv_data;
int ret, size;
if (s->pb->eof_reached)
return AVERROR(EIO);
size = MAX_SIZE;
if(size > mmf->data_size)
size = mmf->data_size;
if(!size)
return AVERROR(EIO);
if (av_new_packet(pkt, size))
return AVERROR(EIO);
pkt->stream_index = 0;
ret = avio_read(s->pb, pkt->data, pkt->size);
if (ret < 0)
av_free_packet(pkt);
mmf->data_size -= ret;
pkt->size = ret;
return ret;
}
#if CONFIG_MMF_DEMUXER
AVInputFormat ff_mmf_demuxer = {
.name = "mmf",
.long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
.priv_data_size = sizeof(MMFContext),
.read_probe = mmf_probe,
.read_header = mmf_read_header,
.read_packet = mmf_read_packet,
.read_seek = ff_pcm_read_seek,
};
#endif
#if CONFIG_MMF_MUXER
AVOutputFormat ff_mmf_muxer = {
.name = "mmf",
.long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
.mime_type = "application/vnd.smaf",
.extensions = "mmf",
.priv_data_size = sizeof(MMFContext),
.audio_codec = AV_CODEC_ID_ADPCM_YAMAHA,
.video_codec = AV_CODEC_ID_NONE,
.write_header = mmf_write_header,
.write_packet = mmf_write_packet,
.write_trailer = mmf_write_trailer,
};
#endif
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