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