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ffmpeg / libavformat / flvenc.c @ a1b79792

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/*
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 * FLV muxer
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 * Copyright (c) 2003 The FFmpeg Project
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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 "avformat.h"
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#include "flv.h"
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#include "internal.h"
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#include "avc.h"
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#include "metadata.h"
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#undef NDEBUG
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#include <assert.h>
29

    
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static const AVCodecTag flv_video_codec_ids[] = {
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    {CODEC_ID_FLV1,    FLV_CODECID_H263  },
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    {CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
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    {CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2},
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    {CODEC_ID_VP6F,    FLV_CODECID_VP6   },
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    {CODEC_ID_VP6,     FLV_CODECID_VP6   },
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    {CODEC_ID_H264,    FLV_CODECID_H264  },
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    {CODEC_ID_NONE,    0}
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};
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static const AVCodecTag flv_audio_codec_ids[] = {
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    {CODEC_ID_MP3,       FLV_CODECID_MP3    >> FLV_AUDIO_CODECID_OFFSET},
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    {CODEC_ID_PCM_U8,    FLV_CODECID_PCM    >> FLV_AUDIO_CODECID_OFFSET},
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    {CODEC_ID_PCM_S16BE, FLV_CODECID_PCM    >> FLV_AUDIO_CODECID_OFFSET},
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    {CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET},
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    {CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM  >> FLV_AUDIO_CODECID_OFFSET},
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    {CODEC_ID_AAC,       FLV_CODECID_AAC    >> FLV_AUDIO_CODECID_OFFSET},
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    {CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET},
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    {CODEC_ID_SPEEX,     FLV_CODECID_SPEEX  >> FLV_AUDIO_CODECID_OFFSET},
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    {CODEC_ID_NONE,      0}
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};
51

    
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typedef struct FLVContext {
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    int reserved;
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    int64_t duration_offset;
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    int64_t filesize_offset;
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    int64_t duration;
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    int delay; ///< first dts delay for AVC
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    int64_t last_video_ts;
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} FLVContext;
60

    
61
static int get_audio_flags(AVCodecContext *enc){
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    int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;
63

    
64
    if (enc->codec_id == CODEC_ID_AAC) // specs force these parameters
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        return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
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    else if (enc->codec_id == CODEC_ID_SPEEX) {
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        if (enc->sample_rate != 16000) {
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            av_log(enc, AV_LOG_ERROR, "flv only supports wideband (16kHz) Speex audio\n");
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            return -1;
70
        }
71
        if (enc->channels != 1) {
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            av_log(enc, AV_LOG_ERROR, "flv only supports mono Speex audio\n");
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            return -1;
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        }
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        if (enc->frame_size / 320 > 8) {
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            av_log(enc, AV_LOG_WARNING, "Warning: Speex stream has more than "
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                                        "8 frames per packet. Adobe Flash "
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                                        "Player cannot handle this!\n");
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        }
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        return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
81
    } else {
82
    switch (enc->sample_rate) {
83
        case    44100:
84
            flags |= FLV_SAMPLERATE_44100HZ;
85
            break;
86
        case    22050:
87
            flags |= FLV_SAMPLERATE_22050HZ;
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            break;
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        case    11025:
90
            flags |= FLV_SAMPLERATE_11025HZ;
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            break;
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        case     8000: //nellymoser only
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        case     5512: //not mp3
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            if(enc->codec_id != CODEC_ID_MP3){
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                flags |= FLV_SAMPLERATE_SPECIAL;
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                break;
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            }
98
        default:
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            av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
100
            return -1;
101
    }
102
    }
103

    
104
    if (enc->channels > 1) {
105
        flags |= FLV_STEREO;
106
    }
107

    
108
    switch(enc->codec_id){
109
    case CODEC_ID_MP3:
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        flags |= FLV_CODECID_MP3    | FLV_SAMPLESSIZE_16BIT;
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        break;
112
    case CODEC_ID_PCM_U8:
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        flags |= FLV_CODECID_PCM    | FLV_SAMPLESSIZE_8BIT;
114
        break;
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    case CODEC_ID_PCM_S16BE:
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        flags |= FLV_CODECID_PCM    | FLV_SAMPLESSIZE_16BIT;
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        break;
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    case CODEC_ID_PCM_S16LE:
119
        flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
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        break;
121
    case CODEC_ID_ADPCM_SWF:
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        flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
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        break;
124
    case CODEC_ID_NELLYMOSER:
125
        if (enc->sample_rate == 8000) {
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            flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
127
        } else {
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            flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
129
        }
130
        break;
131
    case 0:
132
        flags |= enc->codec_tag<<4;
133
        break;
134
    default:
135
        av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
136
        return -1;
137
    }
138

    
139
    return flags;
140
}
141

    
142
static void put_amf_string(AVIOContext *pb, const char *str)
143
{
144
    size_t len = strlen(str);
145
    avio_wb16(pb, len);
146
    avio_write(pb, str, len);
147
}
148

    
149
static void put_avc_eos_tag(AVIOContext *pb, unsigned ts) {
150
    avio_w8(pb, FLV_TAG_TYPE_VIDEO);
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    avio_wb24(pb, 5);  /* Tag Data Size */
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    avio_wb24(pb, ts);  /* lower 24 bits of timestamp in ms*/
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    avio_w8(pb, (ts >> 24) & 0x7F);  /* MSB of ts in ms*/
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    avio_wb24(pb, 0);  /* StreamId = 0 */
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    avio_w8(pb, 23);  /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
156
    avio_w8(pb, 2);  /* AVC end of sequence */
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    avio_wb24(pb, 0);  /* Always 0 for AVC EOS. */
158
    avio_wb32(pb, 16);  /* Size of FLV tag */
159
}
160

    
161
static void put_amf_double(AVIOContext *pb, double d)
162
{
163
    avio_w8(pb, AMF_DATA_TYPE_NUMBER);
164
    avio_wb64(pb, av_dbl2int(d));
165
}
166

    
167
static void put_amf_bool(AVIOContext *pb, int b) {
168
    avio_w8(pb, AMF_DATA_TYPE_BOOL);
169
    avio_w8(pb, !!b);
170
}
171

    
172
static int flv_write_header(AVFormatContext *s)
173
{
174
    AVIOContext *pb = s->pb;
175
    FLVContext *flv = s->priv_data;
176
    AVCodecContext *audio_enc = NULL, *video_enc = NULL;
177
    int i;
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    double framerate = 0.0;
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    int metadata_size_pos, data_size;
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    AVMetadataTag *tag = NULL;
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182
    for(i=0; i<s->nb_streams; i++){
183
        AVCodecContext *enc = s->streams[i]->codec;
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        if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
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            if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
186
                framerate = av_q2d(s->streams[i]->r_frame_rate);
187
            } else {
188
                framerate = 1/av_q2d(s->streams[i]->codec->time_base);
189
            }
190
            video_enc = enc;
191
            if(enc->codec_tag == 0) {
192
                av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
193
                return -1;
194
            }
195
        } else {
196
            audio_enc = enc;
197
            if(get_audio_flags(enc)<0)
198
                return -1;
199
        }
200
        av_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
201
    }
202
    avio_write(pb, "FLV", 3);
203
    avio_w8(pb,1);
204
    avio_w8(pb,   FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
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                 + FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
206
    avio_wb32(pb,9);
207
    avio_wb32(pb,0);
208

    
209
    for(i=0; i<s->nb_streams; i++){
210
        if(s->streams[i]->codec->codec_tag == 5){
211
            avio_w8(pb,8); // message type
212
            avio_wb24(pb,0); // include flags
213
            avio_wb24(pb,0); // time stamp
214
            avio_wb32(pb,0); // reserved
215
            avio_wb32(pb,11); // size
216
            flv->reserved=5;
217
        }
218
    }
219

    
220
    flv->last_video_ts = -1;
221

    
222
    /* write meta_tag */
223
    avio_w8(pb, 18);         // tag type META
224
    metadata_size_pos= url_ftell(pb);
225
    avio_wb24(pb, 0);          // size of data part (sum of all parts below)
226
    avio_wb24(pb, 0);          // time stamp
227
    avio_wb32(pb, 0);          // reserved
228

    
229
    /* now data of data_size size */
230

    
231
    /* first event name as a string */
232
    avio_w8(pb, AMF_DATA_TYPE_STRING);
233
    put_amf_string(pb, "onMetaData"); // 12 bytes
234

    
235
    /* mixed array (hash) with size and string/type/data tuples */
236
    avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
237
    avio_wb32(pb, 5*!!video_enc + 5*!!audio_enc + 2); // +2 for duration and file size
238

    
239
    put_amf_string(pb, "duration");
240
    flv->duration_offset= url_ftell(pb);
241
    put_amf_double(pb, s->duration / AV_TIME_BASE); // fill in the guessed duration, it'll be corrected later if incorrect
242

    
243
    if(video_enc){
244
        put_amf_string(pb, "width");
245
        put_amf_double(pb, video_enc->width);
246

    
247
        put_amf_string(pb, "height");
248
        put_amf_double(pb, video_enc->height);
249

    
250
        put_amf_string(pb, "videodatarate");
251
        put_amf_double(pb, video_enc->bit_rate / 1024.0);
252

    
253
        put_amf_string(pb, "framerate");
254
        put_amf_double(pb, framerate);
255

    
256
        put_amf_string(pb, "videocodecid");
257
        put_amf_double(pb, video_enc->codec_tag);
258
    }
259

    
260
    if(audio_enc){
261
        put_amf_string(pb, "audiodatarate");
262
        put_amf_double(pb, audio_enc->bit_rate / 1024.0);
263

    
264
        put_amf_string(pb, "audiosamplerate");
265
        put_amf_double(pb, audio_enc->sample_rate);
266

    
267
        put_amf_string(pb, "audiosamplesize");
268
        put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16);
269

    
270
        put_amf_string(pb, "stereo");
271
        put_amf_bool(pb, audio_enc->channels == 2);
272

    
273
        put_amf_string(pb, "audiocodecid");
274
        put_amf_double(pb, audio_enc->codec_tag);
275
    }
276

    
277
    while ((tag = av_metadata_get(s->metadata, "", tag, AV_METADATA_IGNORE_SUFFIX))) {
278
        put_amf_string(pb, tag->key);
279
        avio_w8(pb, AMF_DATA_TYPE_STRING);
280
        put_amf_string(pb, tag->value);
281
    }
282

    
283
    put_amf_string(pb, "filesize");
284
    flv->filesize_offset= url_ftell(pb);
285
    put_amf_double(pb, 0); // delayed write
286

    
287
    put_amf_string(pb, "");
288
    avio_w8(pb, AMF_END_OF_OBJECT);
289

    
290
    /* write total size of tag */
291
    data_size= url_ftell(pb) - metadata_size_pos - 10;
292
    url_fseek(pb, metadata_size_pos, SEEK_SET);
293
    avio_wb24(pb, data_size);
294
    url_fseek(pb, data_size + 10 - 3, SEEK_CUR);
295
    avio_wb32(pb, data_size + 11);
296

    
297
    for (i = 0; i < s->nb_streams; i++) {
298
        AVCodecContext *enc = s->streams[i]->codec;
299
        if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264) {
300
            int64_t pos;
301
            avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
302
                     FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
303
            avio_wb24(pb, 0); // size patched later
304
            avio_wb24(pb, 0); // ts
305
            avio_w8(pb, 0); // ts ext
306
            avio_wb24(pb, 0); // streamid
307
            pos = url_ftell(pb);
308
            if (enc->codec_id == CODEC_ID_AAC) {
309
                avio_w8(pb, get_audio_flags(enc));
310
                avio_w8(pb, 0); // AAC sequence header
311
                avio_write(pb, enc->extradata, enc->extradata_size);
312
            } else {
313
                avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
314
                avio_w8(pb, 0); // AVC sequence header
315
                avio_wb24(pb, 0); // composition time
316
                ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
317
            }
318
            data_size = url_ftell(pb) - pos;
319
            url_fseek(pb, -data_size - 10, SEEK_CUR);
320
            avio_wb24(pb, data_size);
321
            url_fseek(pb, data_size + 10 - 3, SEEK_CUR);
322
            avio_wb32(pb, data_size + 11); // previous tag size
323
        }
324
    }
325

    
326
    return 0;
327
}
328

    
329
static int flv_write_trailer(AVFormatContext *s)
330
{
331
    int64_t file_size;
332

    
333
    AVIOContext *pb = s->pb;
334
    FLVContext *flv = s->priv_data;
335
    int i;
336

    
337
    /* Add EOS tag */
338
    for (i = 0; i < s->nb_streams; i++) {
339
        AVCodecContext *enc = s->streams[i]->codec;
340
        if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
341
                enc->codec_id == CODEC_ID_H264) {
342
            put_avc_eos_tag(pb, flv->last_video_ts);
343
        }
344
    }
345

    
346
    file_size = url_ftell(pb);
347

    
348
    /* update informations */
349
    url_fseek(pb, flv->duration_offset, SEEK_SET);
350
    put_amf_double(pb, flv->duration / (double)1000);
351
    url_fseek(pb, flv->filesize_offset, SEEK_SET);
352
    put_amf_double(pb, file_size);
353

    
354
    url_fseek(pb, file_size, SEEK_SET);
355
    return 0;
356
}
357

    
358
static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
359
{
360
    AVIOContext *pb = s->pb;
361
    AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
362
    FLVContext *flv = s->priv_data;
363
    unsigned ts;
364
    int size= pkt->size;
365
    uint8_t *data= NULL;
366
    int flags, flags_size;
367

    
368
//    av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
369

    
370
    if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
371
       enc->codec_id == CODEC_ID_AAC)
372
        flags_size= 2;
373
    else if(enc->codec_id == CODEC_ID_H264)
374
        flags_size= 5;
375
    else
376
        flags_size= 1;
377

    
378
    if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
379
        avio_w8(pb, FLV_TAG_TYPE_VIDEO);
380

    
381
        flags = enc->codec_tag;
382
        if(flags == 0) {
383
            av_log(enc, AV_LOG_ERROR, "video codec %X not compatible with flv\n",enc->codec_id);
384
            return -1;
385
        }
386

    
387
        flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
388
    } else {
389
        assert(enc->codec_type == AVMEDIA_TYPE_AUDIO);
390
        flags = get_audio_flags(enc);
391

    
392
        assert(size);
393

    
394
        avio_w8(pb, FLV_TAG_TYPE_AUDIO);
395
    }
396

    
397
    if (enc->codec_id == CODEC_ID_H264) {
398
        /* check if extradata looks like mp4 formated */
399
        if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
400
            if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
401
                return -1;
402
        }
403
        if (!flv->delay && pkt->dts < 0)
404
            flv->delay = -pkt->dts;
405
    }
406

    
407
    ts = pkt->dts + flv->delay; // add delay to force positive dts
408
    if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
409
        if (flv->last_video_ts < ts)
410
            flv->last_video_ts = ts;
411
    }
412
    avio_wb24(pb,size + flags_size);
413
    avio_wb24(pb,ts);
414
    avio_w8(pb,(ts >> 24) & 0x7F); // timestamps are 32bits _signed_
415
    avio_wb24(pb,flv->reserved);
416
    avio_w8(pb,flags);
417
    if (enc->codec_id == CODEC_ID_VP6)
418
        avio_w8(pb,0);
419
    if (enc->codec_id == CODEC_ID_VP6F)
420
        avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
421
    else if (enc->codec_id == CODEC_ID_AAC)
422
        avio_w8(pb,1); // AAC raw
423
    else if (enc->codec_id == CODEC_ID_H264) {
424
        avio_w8(pb,1); // AVC NALU
425
        avio_wb24(pb,pkt->pts - pkt->dts);
426
    }
427

    
428
    avio_write(pb, data ? data : pkt->data, size);
429

    
430
    avio_wb32(pb,size+flags_size+11); // previous tag size
431
    flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
432

    
433
    put_flush_packet(pb);
434

    
435
    av_free(data);
436

    
437
    return 0;
438
}
439

    
440
AVOutputFormat ff_flv_muxer = {
441
    "flv",
442
    NULL_IF_CONFIG_SMALL("FLV format"),
443
    "video/x-flv",
444
    "flv",
445
    sizeof(FLVContext),
446
#if CONFIG_LIBMP3LAME
447
    CODEC_ID_MP3,
448
#else // CONFIG_LIBMP3LAME
449
    CODEC_ID_ADPCM_SWF,
450
#endif // CONFIG_LIBMP3LAME
451
    CODEC_ID_FLV1,
452
    flv_write_header,
453
    flv_write_packet,
454
    flv_write_trailer,
455
    .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
456
    .flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
457
};