libavformat/mmf.c - third_party/ffmpeg - Git at Google

 /*
  * Yamaha SMAF format
  * Copyright (c) 2005 Vidar Madsen
  *
  * This file is part of FFmpeg.
  *
  * 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.
  *
  * 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 FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #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,
                            AVFormatParameters *ap)
 {
     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 = CODEC_ID_ADPCM_YAMAHA;
     st->codec->sample_rate = rate;
     st->codec->channels = 1;
     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 (url_feof(s->pb))
         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      = 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       = CODEC_ID_ADPCM_YAMAHA,
     .video_codec       = CODEC_ID_NONE,
     .write_header      = mmf_write_header,
     .write_packet      = mmf_write_packet,
     .write_trailer     = mmf_write_trailer,
 };
 #endif
	/*
	* Yamaha SMAF format
	* Copyright (c) 2005 Vidar Madsen
	*
	* This file is part of FFmpeg.
	*
	* 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.
	*
	* 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 FFmpeg; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	*/
	#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,
	AVFormatParameters *ap)
	{
	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 = CODEC_ID_ADPCM_YAMAHA;
	st->codec->sample_rate = rate;
	st->codec->channels = 1;
	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 (url_feof(s->pb))
	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 = 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 = CODEC_ID_ADPCM_YAMAHA,
	.video_codec = CODEC_ID_NONE,
	.write_header = mmf_write_header,
	.write_packet = mmf_write_packet,
	.write_trailer = mmf_write_trailer,
	};
	#endif