mmf.c 9.28 KB
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/*
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 * Yamaha SMAF format
 * Copyright (c) 2005 Vidar Madsen
 *
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 * This file is part of FFmpeg.
 *
 * 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
 * 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
 * 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
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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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    if ((code < 0) || (code > 4))
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        return -1;
    return mmf_rates[code];
}

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#if CONFIG_MMF_MUXER
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static int mmf_rate_code(int rate)
{
    int i;
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    for (i = 0; i < 5; i++)
        if (mmf_rates[i] == rate)
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            return i;
    return -1;
}

/* 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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}

static int mmf_write_header(AVFormatContext *s)
{
    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," :
                          "VN:"LIBAVFORMAT_IDENT",";
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    rate = mmf_rate_code(s->streams[0]->codec->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]->codec->sample_rate);
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        return AVERROR(EINVAL);
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    }
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    mmf->stereo = s->streams[0]->codec->channels > 1;
    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, "
               "add '-strict %d' if you want to use it.\n",
               FF_COMPLIANCE_EXPERIMENTAL);
        return AVERROR(EINVAL);
    }

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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 */
    avio_w8(pb, 1); /* code type */
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    avio_w8(pb, 0); /* status */
    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);
    avio_wb32(pb, 0);
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    mmf->atrpos = avio_tell(pb);
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    avio_w8(pb, 0); /* format type */
    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 */
    avio_w8(pb, 2); /* time base d */
    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]->codec->sample_rate);
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    avio_flush(pb);
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    return 0;
}

/* 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 {
        val -= 128;
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        avio_w8(pb, 0x80 | val >> 7);
        avio_w8(pb, 0x7f & val);
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    }
}

static int mmf_write_trailer(AVFormatContext *s)
{
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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) {
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        /* Fill in length fields */
        end_tag_be(pb, mmf->awapos);
        end_tag_be(pb, mmf->atrpos);
        end_tag_be(pb, 8);

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        pos  = avio_tell(pb);
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        size = pos - mmf->awapos;

        /* 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]->codec->sample_rate;
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        put_varlength(pb, gatetime); /* duration */

        /* "nop" */
        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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        avio_flush(pb);
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    }
    return 0;
}
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#endif /* CONFIG_MMF_MUXER */
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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 */
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static int mmf_read_header(AVFormatContext *s)
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{
    MMFContext *mmf = s->priv_data;
    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)) {
        tag  = avio_rl32(pb);
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        size = avio_rb32(pb);
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        if (tag == MKTAG('C', 'N', 'T', 'I'))
            continue;
        if (tag == MKTAG('O', 'P', 'D', 'A'))
            continue;
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        break;
    }

    /* Tag = "ATRx", where "x" = track number */
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    if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) {
        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)) {
        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 */
    avio_r8(pb); /* sequence type */
    params = avio_r8(pb); /* (channel << 7) | (format << 4) | rate */
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    rate   = mmf_rate(params & 0x0f);
    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 */
    avio_r8(pb); /* time base d */
    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)) {
        tag  = avio_rl32(pb);
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        size = avio_rb32(pb);
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        if (tag == MKTAG('A', 't', 's', 'q'))
            continue;
        if (tag == MKTAG('A', 's', 'p', 'I'))
            continue;
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        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);
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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->codec->codec_type            = AVMEDIA_TYPE_AUDIO;
    st->codec->codec_id              = AV_CODEC_ID_ADPCM_YAMAHA;
    st->codec->sample_rate           = rate;
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    st->codec->channels              = (params >> 7) + 1;
    st->codec->channel_layout        = params >> 7 ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
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    st->codec->bits_per_coded_sample = 4;
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    st->codec->bit_rate              = st->codec->sample_rate *
                                       st->codec->bits_per_coded_sample;
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    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
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    return 0;
}

#define MAX_SIZE 4096

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static int mmf_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
    MMFContext *mmf = s->priv_data;
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    int64_t left, size;
    int ret;
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    left = mmf->data_end - avio_tell(s->pb);
    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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#if CONFIG_MMF_DEMUXER
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AVInputFormat ff_mmf_demuxer = {
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    .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,
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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",
    .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,
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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