aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/cafenc.c
blob: 89ecb51e53a4ada2156620c8358b9a61b7727210 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
/*
 * Core Audio Format muxer
 * Copyright (c) 2011 Carl Eugen Hoyos
 *
 * 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 "caf.h"
#include "isom.h"
#include "avio_internal.h"
#include "mux.h"
#include "libavutil/intfloat.h"
#include "libavutil/dict.h"
#include "libavutil/mem.h"

#define FRAME_SIZE_OFFSET 40

typedef struct {
    int64_t data;
    int size_buffer_size;
    int size_entries_used;
    int packets;
} CAFContext;

static uint32_t codec_flags(enum AVCodecID codec_id) {
    switch (codec_id) {
    case AV_CODEC_ID_PCM_F32BE:
    case AV_CODEC_ID_PCM_F64BE:
        return 1; //< kCAFLinearPCMFormatFlagIsFloat
    case AV_CODEC_ID_PCM_S16LE:
    case AV_CODEC_ID_PCM_S24LE:
    case AV_CODEC_ID_PCM_S32LE:
        return 2; //< kCAFLinearPCMFormatFlagIsLittleEndian
    case AV_CODEC_ID_PCM_F32LE:
    case AV_CODEC_ID_PCM_F64LE:
        return 3; //< kCAFLinearPCMFormatFlagIsFloat | kCAFLinearPCMFormatFlagIsLittleEndian
    default:
        return 0;
    }
}

static uint32_t samples_per_packet(const AVCodecParameters *par) {
    enum AVCodecID codec_id = par->codec_id;
    int channels = par->ch_layout.nb_channels, block_align = par->block_align;
    int frame_size = par->frame_size, sample_rate = par->sample_rate;

    switch (codec_id) {
    case AV_CODEC_ID_PCM_S8:
    case AV_CODEC_ID_PCM_S16LE:
    case AV_CODEC_ID_PCM_S16BE:
    case AV_CODEC_ID_PCM_S24LE:
    case AV_CODEC_ID_PCM_S24BE:
    case AV_CODEC_ID_PCM_S32LE:
    case AV_CODEC_ID_PCM_S32BE:
    case AV_CODEC_ID_PCM_F32LE:
    case AV_CODEC_ID_PCM_F32BE:
    case AV_CODEC_ID_PCM_F64LE:
    case AV_CODEC_ID_PCM_F64BE:
    case AV_CODEC_ID_PCM_ALAW:
    case AV_CODEC_ID_PCM_MULAW:
        return 1;
    case AV_CODEC_ID_MACE3:
    case AV_CODEC_ID_MACE6:
        return 6;
    case AV_CODEC_ID_ADPCM_IMA_QT:
        return 64;
    case AV_CODEC_ID_AMR_NB:
    case AV_CODEC_ID_GSM:
    case AV_CODEC_ID_ILBC:
    case AV_CODEC_ID_QCELP:
        return 160;
    case AV_CODEC_ID_GSM_MS:
        return 320;
    case AV_CODEC_ID_MP1:
        return 384;
    case AV_CODEC_ID_OPUS:
        return frame_size * 48000 / sample_rate;
    case AV_CODEC_ID_MP2:
    case AV_CODEC_ID_MP3:
        return 1152;
    case AV_CODEC_ID_AC3:
        return 1536;
    case AV_CODEC_ID_QDM2:
    case AV_CODEC_ID_QDMC:
        return 2048 * channels;
    case AV_CODEC_ID_ALAC:
        return 4096;
    case AV_CODEC_ID_ADPCM_IMA_WAV:
        return (block_align - 4 * channels) * 8 / (4 * channels) + 1;
    case AV_CODEC_ID_ADPCM_MS:
        return (block_align - 7 * channels) * 2 / channels + 2;
    default:
        return 0;
    }
}

static int caf_write_header(AVFormatContext *s)
{
    AVIOContext *pb = s->pb;
    AVCodecParameters *par = s->streams[0]->codecpar;
    CAFContext *caf = s->priv_data;
    const AVDictionaryEntry *t = NULL;
    unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, par->codec_id);
    int64_t chunk_size = 0;
    int frame_size = par->frame_size, sample_rate = par->sample_rate;

    switch (par->codec_id) {
    case AV_CODEC_ID_AAC:
        av_log(s, AV_LOG_ERROR, "muxing codec currently unsupported\n");
        return AVERROR_PATCHWELCOME;
    }

    if (par->codec_id == AV_CODEC_ID_OPUS && par->ch_layout.nb_channels > 2) {
        av_log(s, AV_LOG_ERROR, "Only mono and stereo are supported for Opus\n");
        return AVERROR_INVALIDDATA;
    }

    if (!codec_tag) {
        av_log(s, AV_LOG_ERROR, "unsupported codec\n");
        return AVERROR_INVALIDDATA;
    }

    if (!par->block_align && !(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
        av_log(s, AV_LOG_ERROR, "Muxing variable packet size not supported on non seekable output\n");
        return AVERROR_INVALIDDATA;
    }

    if (par->codec_id != AV_CODEC_ID_MP3 || frame_size != 576)
        frame_size = samples_per_packet(par);

    if (par->codec_id == AV_CODEC_ID_OPUS)
        sample_rate = 48000;

    ffio_wfourcc(pb, "caff"); //< mFileType
    avio_wb16(pb, 1);         //< mFileVersion
    avio_wb16(pb, 0);         //< mFileFlags

    ffio_wfourcc(pb, "desc");                         //< Audio Description chunk
    avio_wb64(pb, 32);                                //< mChunkSize
    avio_wb64(pb, av_double2int(sample_rate));        //< mSampleRate
    avio_wl32(pb, codec_tag);                         //< mFormatID
    avio_wb32(pb, codec_flags(par->codec_id));        //< mFormatFlags
    avio_wb32(pb, par->block_align);                  //< mBytesPerPacket
    avio_wb32(pb, frame_size);                        //< mFramesPerPacket
    avio_wb32(pb, par->ch_layout.nb_channels);        //< mChannelsPerFrame
    avio_wb32(pb, av_get_bits_per_sample(par->codec_id)); //< mBitsPerChannel

    if (par->ch_layout.order == AV_CHANNEL_ORDER_NATIVE) {
        ffio_wfourcc(pb, "chan");
        avio_wb64(pb, 12);
        ff_mov_write_chan(pb, par->ch_layout.u.mask);
    }

    if (par->codec_id == AV_CODEC_ID_ALAC) {
        ffio_wfourcc(pb, "kuki");
        avio_wb64(pb, 12 + par->extradata_size);
        avio_write(pb, "\0\0\0\14frmaalac", 12);
        avio_write(pb, par->extradata, par->extradata_size);
    } else if (par->codec_id == AV_CODEC_ID_AMR_NB) {
        ffio_wfourcc(pb, "kuki");
        avio_wb64(pb, 29);
        avio_write(pb, "\0\0\0\14frmasamr", 12);
        avio_wb32(pb, 0x11); /* size */
        avio_write(pb, "samrFFMP", 8);
        avio_w8(pb, 0); /* decoder version */

        avio_wb16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */
        avio_w8(pb, 0x00); /* Mode change period (no restriction) */
        avio_w8(pb, 0x01); /* Frames per sample */
    } else if (par->codec_id == AV_CODEC_ID_QDM2 || par->codec_id == AV_CODEC_ID_QDMC) {
        ffio_wfourcc(pb, "kuki");
        avio_wb64(pb, par->extradata_size);
        avio_write(pb, par->extradata, par->extradata_size);
    }

    ff_standardize_creation_time(s);
    if (av_dict_count(s->metadata)) {
        ffio_wfourcc(pb, "info"); //< Information chunk
        while ((t = av_dict_iterate(s->metadata, t))) {
            chunk_size += strlen(t->key) + strlen(t->value) + 2;
        }
        avio_wb64(pb, chunk_size + 4);
        avio_wb32(pb, av_dict_count(s->metadata));
        t = NULL;
        while ((t = av_dict_iterate(s->metadata, t))) {
            avio_put_str(pb, t->key);
            avio_put_str(pb, t->value);
        }
    }

    ffio_wfourcc(pb, "data"); //< Audio Data chunk
    caf->data = avio_tell(pb);
    avio_wb64(pb, -1);        //< mChunkSize
    avio_wb32(pb, 0);         //< mEditCount

    return 0;
}

static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    CAFContext *caf = s->priv_data;
    AVStream *const st = s->streams[0];

    if (!st->codecpar->block_align) {
        uint8_t *pkt_sizes;
        int i, alloc_size = caf->size_entries_used + 5U;
        if (alloc_size < 0)
            return AVERROR(ERANGE);

        pkt_sizes = av_fast_realloc(st->priv_data,
                                    &caf->size_buffer_size,
                                    alloc_size);
        if (!pkt_sizes)
            return AVERROR(ENOMEM);
        st->priv_data = pkt_sizes;
        for (i = 4; i > 0; i--) {
            unsigned top = pkt->size >> i * 7;
            if (top)
                pkt_sizes[caf->size_entries_used++] = 128 | top;
        }
        pkt_sizes[caf->size_entries_used++] = pkt->size & 127;
        caf->packets++;
    }
    avio_write(s->pb, pkt->data, pkt->size);
    return 0;
}

static int caf_write_trailer(AVFormatContext *s)
{
    CAFContext *caf = s->priv_data;
    AVIOContext *pb = s->pb;
    AVStream *st = s->streams[0];
    AVCodecParameters *par = st->codecpar;

    if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
        int64_t file_size = avio_tell(pb);

        avio_seek(pb, caf->data, SEEK_SET);
        avio_wb64(pb, file_size - caf->data - 8);
        if (!par->block_align) {
            int packet_size = samples_per_packet(par);
            if (!packet_size) {
                packet_size = st->duration / (caf->packets - 1);
                avio_seek(pb, FRAME_SIZE_OFFSET, SEEK_SET);
                avio_wb32(pb, packet_size);
            }
            avio_seek(pb, file_size, SEEK_SET);
            ffio_wfourcc(pb, "pakt");
            avio_wb64(pb, caf->size_entries_used + 24U);
            avio_wb64(pb, caf->packets); ///< mNumberPackets
            avio_wb64(pb, caf->packets * packet_size); ///< mNumberValidFrames
            avio_wb32(pb, 0); ///< mPrimingFrames
            avio_wb32(pb, 0); ///< mRemainderFrames
            avio_write(pb, st->priv_data, caf->size_entries_used);
        }
    }
    return 0;
}

const FFOutputFormat ff_caf_muxer = {
    .p.name         = "caf",
    .p.long_name    = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"),
    .p.mime_type    = "audio/x-caf",
    .p.extensions   = "caf",
    .priv_data_size = sizeof(CAFContext),
    .p.audio_codec  = AV_CODEC_ID_PCM_S16BE,
    .p.video_codec  = AV_CODEC_ID_NONE,
    .p.subtitle_codec = AV_CODEC_ID_NONE,
    .flags_internal   = FF_OFMT_FLAG_MAX_ONE_OF_EACH,
    .write_header   = caf_write_header,
    .write_packet   = caf_write_packet,
    .write_trailer  = caf_write_trailer,
    .p.codec_tag    = ff_caf_codec_tags_list,
};