/src/ffmpeg/libavformat/mmf.c

Source
/*
 * 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 "config_components.h"

#include "libavutil/channel_layout.h"
#include "avformat.h"
#include "avio_internal.h"
#include "demux.h"
#include "internal.h"
#include "mux.h"
#include "pcm.h"
#include "rawenc.h"
#include "riff.h"
#include "version.h"

typedef struct MMFContext {
    int64_t atrpos, atsqpos, awapos;
    int64_t data_end;
    int stereo;
} 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;
    const char *version = s->flags & AVFMT_FLAG_BITEXACT ?
                          "VN:Lavf," :
                          "VN:"LIBAVFORMAT_IDENT",";

    rate = mmf_rate_code(s->streams[0]->codecpar->sample_rate);
    if (rate < 0) {
        av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d, supported are 4000, 8000, 11025, 22050 and 44100\n",
               s->streams[0]->codecpar->sample_rate);
        return AVERROR(EINVAL);
    }

    mmf->stereo = s->streams[0]->codecpar->ch_layout.nb_channels > 1;
    if (mmf->stereo &&
        s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
        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);
    }

    ffio_wfourcc(pb, "MMMD");
    avio_wb32(pb, 0);
    pos = ff_start_tag(pb, "CNTI");
    avio_w8(pb, 0); /* class */
    avio_w8(pb, 1); /* type */
    avio_w8(pb, 1); /* code type */
    avio_w8(pb, 0); /* status */
    avio_w8(pb, 0); /* counts */
    end_tag_be(pb, pos);

    pos = ff_start_tag(pb, "OPDA");
    avio_write(pb, version, strlen(version)); /* 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, (mmf->stereo << 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]->codecpar->sample_rate);

    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 & AVIO_SEEKABLE_NORMAL) {
        /* 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, (mmf->stereo << 6) | 1); /* (channel << 6) | wavenum */
        gatetime = size * 500 / s->streams[0]->codecpar->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);
    }
    return 0;
}
#endif /* CONFIG_MMF_MUXER */

static int mmf_probe(const 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 AVERROR_INVALIDDATA;
    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 AVERROR_PATCHWELCOME;
    }
    if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
        av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
        return AVERROR_PATCHWELCOME;
    }

    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 AVERROR_INVALIDDATA;
    }
    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 AVERROR_INVALIDDATA;
    }
    mmf->data_end = avio_tell(pb) + size;

    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);

    st->codecpar->codec_type            = AVMEDIA_TYPE_AUDIO;
    st->codecpar->codec_id              = AV_CODEC_ID_ADPCM_YAMAHA;
    st->codecpar->sample_rate           = rate;
    av_channel_layout_default(&st->codecpar->ch_layout, (params >> 7) + 1);
    st->codecpar->bits_per_coded_sample = 4;
    st->codecpar->bit_rate              = st->codecpar->sample_rate *
                                          st->codecpar->bits_per_coded_sample;

    avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);

    return 0;
}

#define MAX_SIZE 4096

static int mmf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    MMFContext *mmf = s->priv_data;
    int64_t left, size;
    int ret;

    left = mmf->data_end - avio_tell(s->pb);
    size = FFMIN(left, MAX_SIZE);
    if (avio_feof(s->pb) || size <= 0)
        return AVERROR_EOF;

    ret = av_get_packet(s->pb, pkt, size);
    if (ret < 0)
        return ret;

    pkt->stream_index = 0;

    return ret;
}

#if CONFIG_MMF_DEMUXER
const FFInputFormat ff_mmf_demuxer = {
    .p.name         = "mmf",
    .p.long_name    = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
    .p.flags        = AVFMT_GENERIC_INDEX,
    .priv_data_size = sizeof(MMFContext),
    .read_probe     = mmf_probe,
    .read_header    = mmf_read_header,
    .read_packet    = mmf_read_packet,
};
#endif

#if CONFIG_MMF_MUXER
const FFOutputFormat ff_mmf_muxer = {
    .p.name         = "mmf",
    .p.long_name    = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
    .p.mime_type    = "application/vnd.smaf",
    .p.extensions   = "mmf",
    .priv_data_size = sizeof(MMFContext),
    .p.audio_codec  = AV_CODEC_ID_ADPCM_YAMAHA,
    .p.video_codec  = AV_CODEC_ID_NONE,
    .p.subtitle_codec = AV_CODEC_ID_NONE,
    .flags_internal   = FF_OFMT_FLAG_MAX_ONE_OF_EACH |
                        FF_OFMT_FLAG_ONLY_DEFAULT_CODECS,
    .write_header   = mmf_write_header,
    .write_packet   = ff_raw_write_packet,
    .write_trailer  = mmf_write_trailer,
};
#endif

Coverage Report

Created: 2025-11-16 07:20

Line	Count	Source
1		/*
2		* Yamaha SMAF format
3		* Copyright (c) 2005 Vidar Madsen
4		*
5		* This file is part of FFmpeg.
6		*
7		* FFmpeg is free software; you can redistribute it and/or
8		* modify it under the terms of the GNU Lesser General Public
9		* License as published by the Free Software Foundation; either
10		* version 2.1 of the License, or (at your option) any later version.
11		*
12		* FFmpeg is distributed in the hope that it will be useful,
13		* but WITHOUT ANY WARRANTY; without even the implied warranty of
14		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15		* Lesser General Public License for more details.
16		*
17		* You should have received a copy of the GNU Lesser General Public
18		* License along with FFmpeg; if not, write to the Free Software
19		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20		*/
21
22		#include "config_components.h"
23
24		#include "libavutil/channel_layout.h"
25		#include "avformat.h"
26		#include "avio_internal.h"
27		#include "demux.h"
28		#include "internal.h"
29		#include "mux.h"
30		#include "pcm.h"
31		#include "rawenc.h"
32		#include "riff.h"
33		#include "version.h"
34
35		typedef struct MMFContext {
36		int64_t atrpos, atsqpos, awapos;
37		int64_t data_end;
38		int stereo;
39		} MMFContext;
40
41		static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };
42
43		static int mmf_rate(int code)
44	938	{
45	938	if ((code < 0) \|\| (code > 4))
46	1	return -1;
47	937	return mmf_rates[code];
48	938	}
49
50		#if CONFIG_MMF_MUXER
51		static int mmf_rate_code(int rate)
52		{
53		int i;
54		for (i = 0; i < 5; i++)
55		if (mmf_rates[i] == rate)
56		return i;
57		return -1;
58		}
59
60		/* Copy of end_tag() from avienc.c, but for big-endian chunk size */
61		static void end_tag_be(AVIOContext *pb, int64_t start)
62		{
63		int64_t pos;
64
65		pos = avio_tell(pb);
66		avio_seek(pb, start - 4, SEEK_SET);
67		avio_wb32(pb, (uint32_t)(pos - start));
68		avio_seek(pb, pos, SEEK_SET);
69		}
70
71		static int mmf_write_header(AVFormatContext *s)
72		{
73		MMFContext *mmf = s->priv_data;
74		AVIOContext *pb = s->pb;
75		int64_t pos;
76		int rate;
77		const char *version = s->flags & AVFMT_FLAG_BITEXACT ?
78		"VN:Lavf," :
79		"VN:"LIBAVFORMAT_IDENT",";
80
81		rate = mmf_rate_code(s->streams[0]->codecpar->sample_rate);
82		if (rate < 0) {
83		av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d, supported are 4000, 8000, 11025, 22050 and 44100\n",
84		s->streams[0]->codecpar->sample_rate);
85		return AVERROR(EINVAL);
86		}
87
88		mmf->stereo = s->streams[0]->codecpar->ch_layout.nb_channels > 1;
89		if (mmf->stereo &&
90		s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
91		av_log(s, AV_LOG_ERROR, "Yamaha SMAF stereo is experimental, "
92		"add '-strict %d' if you want to use it.\n",
93		FF_COMPLIANCE_EXPERIMENTAL);
94		return AVERROR(EINVAL);
95		}
96
97		ffio_wfourcc(pb, "MMMD");
98		avio_wb32(pb, 0);
99		pos = ff_start_tag(pb, "CNTI");
100		avio_w8(pb, 0); /* class */
101		avio_w8(pb, 1); /* type */
102		avio_w8(pb, 1); /* code type */
103		avio_w8(pb, 0); /* status */
104		avio_w8(pb, 0); /* counts */
105		end_tag_be(pb, pos);
106
107		pos = ff_start_tag(pb, "OPDA");
108		avio_write(pb, version, strlen(version)); /* metadata ("ST:songtitle,VN:version,...") */
109		end_tag_be(pb, pos);
110
111		avio_write(pb, "ATR\x00", 4);
112		avio_wb32(pb, 0);
113		mmf->atrpos = avio_tell(pb);
114		avio_w8(pb, 0); /* format type */
115		avio_w8(pb, 0); /* sequence type */
116		avio_w8(pb, (mmf->stereo << 7) \| (1 << 4) \| rate); /* (channel << 7) \| (format << 4) \| rate */
117		avio_w8(pb, 0); /* wave base bit */
118		avio_w8(pb, 2); /* time base d */
119		avio_w8(pb, 2); /* time base g */
120
121		ffio_wfourcc(pb, "Atsq");
122		avio_wb32(pb, 16);
123		mmf->atsqpos = avio_tell(pb);
124		/* Will be filled on close */
125		avio_write(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
126
127		mmf->awapos = ff_start_tag(pb, "Awa\x01");
128
129		avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codecpar->sample_rate);
130
131		return 0;
132		}
133
134		/* Write a variable-length symbol */
135		static void put_varlength(AVIOContext *pb, int val)
136		{
137		if (val < 128)
138		avio_w8(pb, val);
139		else {
140		val -= 128;
141		avio_w8(pb, 0x80 \| val >> 7);
142		avio_w8(pb, 0x7f & val);
143		}
144		}
145
146		static int mmf_write_trailer(AVFormatContext *s)
147		{
148		AVIOContext *pb = s->pb;
149		MMFContext *mmf = s->priv_data;
150		int64_t pos, size;
151		int gatetime;
152
153		if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
154		/* Fill in length fields */
155		end_tag_be(pb, mmf->awapos);
156		end_tag_be(pb, mmf->atrpos);
157		end_tag_be(pb, 8);
158
159		pos = avio_tell(pb);
160		size = pos - mmf->awapos;
161
162		/* Fill Atsq chunk */
163		avio_seek(pb, mmf->atsqpos, SEEK_SET);
164
165		/* "play wav" */
166		avio_w8(pb, 0); /* start time */
167		avio_w8(pb, (mmf->stereo << 6) \| 1); /* (channel << 6) \| wavenum */
168		gatetime = size * 500 / s->streams[0]->codecpar->sample_rate;
169		put_varlength(pb, gatetime); /* duration */
170
171		/* "nop" */
172		put_varlength(pb, gatetime); /* start time */
173		avio_write(pb, "\xff\x00", 2); /* nop */
174
175		/* "end of sequence" */
176		avio_write(pb, "\x00\x00\x00\x00", 4);
177
178		avio_seek(pb, pos, SEEK_SET);
179		}
180		return 0;
181		}
182		#endif /* CONFIG_MMF_MUXER */
183
184		static int mmf_probe(const AVProbeData *p)
185	964k	{
186		/* check file header */
187	964k	if (p->buf[0] == 'M' && p->buf[1] == 'M' &&
188	1.19k	p->buf[2] == 'M' && p->buf[3] == 'D' &&
189	513	p->buf[8] == 'C' && p->buf[9] == 'N' &&
190	238	p->buf[10] == 'T' && p->buf[11] == 'I')
191	44	return AVPROBE_SCORE_MAX;
192	964k	else
193	964k	return 0;
194	964k	}
195
196		/* mmf input */
197		static int mmf_read_header(AVFormatContext *s)
198	1.71k	{
199	1.71k	MMFContext *mmf = s->priv_data;
200	1.71k	unsigned int tag;
201	1.71k	AVIOContext *pb = s->pb;
202	1.71k	AVStream *st;
203	1.71k	int64_t size;
204	1.71k	int rate, params;
205
206	1.71k	tag = avio_rl32(pb);
207	1.71k	if (tag != MKTAG('M', 'M', 'M', 'D'))
208	196	return AVERROR_INVALIDDATA;
209	1.51k	avio_skip(pb, 4); /* file_size */
210
211		/* Skip some unused chunks that may or may not be present */
212	6.63k	for (;; avio_skip(pb, size)) {
213	6.63k	tag = avio_rl32(pb);
214	6.63k	size = avio_rb32(pb);
215	6.63k	if (tag == MKTAG('C', 'N', 'T', 'I'))
216	3.06k	continue;
217	3.57k	if (tag == MKTAG('O', 'P', 'D', 'A'))
218	2.05k	continue;
219	1.51k	break;
220	3.57k	}
221
222		/* Tag = "ATRx", where "x" = track number */
223	1.51k	if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) {
224	2	av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n");
225	2	return AVERROR_PATCHWELCOME;
226	2	}
227	1.51k	if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
228	576	av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
229	576	return AVERROR_PATCHWELCOME;
230	576	}
231
232	938	avio_r8(pb); /* format type */
233	938	avio_r8(pb); /* sequence type */
234	938	params = avio_r8(pb); /* (channel << 7) \| (format << 4) \| rate */
235	938	rate = mmf_rate(params & 0x0f);
236	938	if (rate < 0) {
237	1	av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
238	1	return AVERROR_INVALIDDATA;
239	1	}
240	937	avio_r8(pb); /* wave base bit */
241	937	avio_r8(pb); /* time base d */
242	937	avio_r8(pb); /* time base g */
243
244		/* Skip some unused chunks that may or may not be present */
245	1.31k	for (;; avio_skip(pb, size)) {
246	1.31k	tag = avio_rl32(pb);
247	1.31k	size = avio_rb32(pb);
248	1.31k	if (tag == MKTAG('A', 't', 's', 'q'))
249	29	continue;
250	1.28k	if (tag == MKTAG('A', 's', 'p', 'I'))
251	351	continue;
252	937	break;
253	1.28k	}
254
255		/* Make sure it's followed by an Awa chunk, aka wave data */
256	937	if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) {
257	234	av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag);
258	234	return AVERROR_INVALIDDATA;
259	234	}
260	703	mmf->data_end = avio_tell(pb) + size;
261
262	703	st = avformat_new_stream(s, NULL);
263	703	if (!st)
264	0	return AVERROR(ENOMEM);
265
266	703	st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
267	703	st->codecpar->codec_id = AV_CODEC_ID_ADPCM_YAMAHA;
268	703	st->codecpar->sample_rate = rate;
269	703	av_channel_layout_default(&st->codecpar->ch_layout, (params >> 7) + 1);
270	703	st->codecpar->bits_per_coded_sample = 4;
271	703	st->codecpar->bit_rate = st->codecpar->sample_rate *
272	703	st->codecpar->bits_per_coded_sample;
273
274	703	avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
275
276	703	return 0;
277	703	}
278
279		#define MAX_SIZE 4096
280
281		static int mmf_read_packet(AVFormatContext s, AVPacket pkt)
282	10.8k	{
283	10.8k	MMFContext *mmf = s->priv_data;
284	10.8k	int64_t left, size;
285	10.8k	int ret;
286
287	10.8k	left = mmf->data_end - avio_tell(s->pb);
288	10.8k	size = FFMIN(left, MAX_SIZE);
289	10.8k	if (avio_feof(s->pb) \|\| size <= 0)
290	1.13k	return AVERROR_EOF;
291
292	9.71k	ret = av_get_packet(s->pb, pkt, size);
293	9.71k	if (ret < 0)
294	90	return ret;
295
296	9.62k	pkt->stream_index = 0;
297
298	9.62k	return ret;
299	9.71k	}
300
301		#if CONFIG_MMF_DEMUXER
302		const FFInputFormat ff_mmf_demuxer = {
303		.p.name = "mmf",
304		.p.long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
305		.p.flags = AVFMT_GENERIC_INDEX,
306		.priv_data_size = sizeof(MMFContext),
307		.read_probe = mmf_probe,
308		.read_header = mmf_read_header,
309		.read_packet = mmf_read_packet,
310		};
311		#endif
312
313		#if CONFIG_MMF_MUXER
314		const FFOutputFormat ff_mmf_muxer = {
315		.p.name = "mmf",
316		.p.long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
317		.p.mime_type = "application/vnd.smaf",
318		.p.extensions = "mmf",
319		.priv_data_size = sizeof(MMFContext),
320		.p.audio_codec = AV_CODEC_ID_ADPCM_YAMAHA,
321		.p.video_codec = AV_CODEC_ID_NONE,
322		.p.subtitle_codec = AV_CODEC_ID_NONE,
323		.flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH \|
324		FF_OFMT_FLAG_ONLY_DEFAULT_CODECS,
325		.write_header = mmf_write_header,
326		.write_packet = ff_raw_write_packet,
327		.write_trailer = mmf_write_trailer,
328		};
329		#endif