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ffmpeg / libavformat / flvenc.c @ c22f2527

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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 "libavutil/intreadwrite.h"
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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>
31

    
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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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};
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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;
62

    
63
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;
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    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;
72
        }
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        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;
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    } else {
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    switch (enc->sample_rate) {
85
        case    44100:
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            flags |= FLV_SAMPLERATE_44100HZ;
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            break;
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        case    22050:
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            flags |= FLV_SAMPLERATE_22050HZ;
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            break;
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        case    11025:
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            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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            }
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        default:
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            av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
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            return -1;
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    }
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    }
105

    
106
    if (enc->channels > 1) {
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        flags |= FLV_STEREO;
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    }
109

    
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    switch(enc->codec_id){
111
    case CODEC_ID_MP3:
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        flags |= FLV_CODECID_MP3    | FLV_SAMPLESSIZE_16BIT;
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        break;
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    case CODEC_ID_PCM_U8:
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        flags |= FLV_CODECID_PCM    | FLV_SAMPLESSIZE_8BIT;
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        break;
117
    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:
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        flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
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        break;
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    case CODEC_ID_ADPCM_SWF:
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        flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
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        break;
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    case CODEC_ID_NELLYMOSER:
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        if (enc->sample_rate == 8000) {
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            flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
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        } else {
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            flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
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        }
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        break;
133
    case 0:
134
        flags |= enc->codec_tag<<4;
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        break;
136
    default:
137
        av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
138
        return -1;
139
    }
140

    
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    return flags;
142
}
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static void put_amf_string(AVIOContext *pb, const char *str)
145
{
146
    size_t len = strlen(str);
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    avio_wb16(pb, len);
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    avio_write(pb, str, len);
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}
150

    
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static void put_avc_eos_tag(AVIOContext *pb, unsigned ts) {
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    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 */
158
    avio_w8(pb, 2);  /* AVC end of sequence */
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    avio_wb24(pb, 0);  /* Always 0 for AVC EOS. */
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    avio_wb32(pb, 16);  /* Size of FLV tag */
161
}
162

    
163
static void put_amf_double(AVIOContext *pb, double d)
164
{
165
    avio_w8(pb, AMF_DATA_TYPE_NUMBER);
166
    avio_wb64(pb, av_dbl2int(d));
167
}
168

    
169
static void put_amf_bool(AVIOContext *pb, int b) {
170
    avio_w8(pb, AMF_DATA_TYPE_BOOL);
171
    avio_w8(pb, !!b);
172
}
173

    
174
static int flv_write_header(AVFormatContext *s)
175
{
176
    AVIOContext *pb = s->pb;
177
    FLVContext *flv = s->priv_data;
178
    AVCodecContext *audio_enc = NULL, *video_enc = NULL;
179
    int i;
180
    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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184
    for(i=0; i<s->nb_streams; i++){
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        AVCodecContext *enc = s->streams[i]->codec;
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        if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
187
            if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
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                framerate = av_q2d(s->streams[i]->r_frame_rate);
189
            } else {
190
                framerate = 1/av_q2d(s->streams[i]->codec->time_base);
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            }
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            video_enc = enc;
193
            if(enc->codec_tag == 0) {
194
                av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
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                return -1;
196
            }
197
        } else {
198
            audio_enc = enc;
199
            if(get_audio_flags(enc)<0)
200
                return -1;
201
        }
202
        av_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
203
    }
204
    avio_write(pb, "FLV", 3);
205
    avio_w8(pb,1);
206
    avio_w8(pb,   FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
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                 + FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
208
    avio_wb32(pb,9);
209
    avio_wb32(pb,0);
210

    
211
    for(i=0; i<s->nb_streams; i++){
212
        if(s->streams[i]->codec->codec_tag == 5){
213
            avio_w8(pb,8); // message type
214
            avio_wb24(pb,0); // include flags
215
            avio_wb24(pb,0); // time stamp
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            avio_wb32(pb,0); // reserved
217
            avio_wb32(pb,11); // size
218
            flv->reserved=5;
219
        }
220
    }
221

    
222
    flv->last_video_ts = -1;
223

    
224
    /* write meta_tag */
225
    avio_w8(pb, 18);         // tag type META
226
    metadata_size_pos= avio_tell(pb);
227
    avio_wb24(pb, 0);          // size of data part (sum of all parts below)
228
    avio_wb24(pb, 0);          // time stamp
229
    avio_wb32(pb, 0);          // reserved
230

    
231
    /* now data of data_size size */
232

    
233
    /* first event name as a string */
234
    avio_w8(pb, AMF_DATA_TYPE_STRING);
235
    put_amf_string(pb, "onMetaData"); // 12 bytes
236

    
237
    /* mixed array (hash) with size and string/type/data tuples */
238
    avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
239
    avio_wb32(pb, 5*!!video_enc + 5*!!audio_enc + 2); // +2 for duration and file size
240

    
241
    put_amf_string(pb, "duration");
242
    flv->duration_offset= avio_tell(pb);
243
    put_amf_double(pb, s->duration / AV_TIME_BASE); // fill in the guessed duration, it'll be corrected later if incorrect
244

    
245
    if(video_enc){
246
        put_amf_string(pb, "width");
247
        put_amf_double(pb, video_enc->width);
248

    
249
        put_amf_string(pb, "height");
250
        put_amf_double(pb, video_enc->height);
251

    
252
        put_amf_string(pb, "videodatarate");
253
        put_amf_double(pb, video_enc->bit_rate / 1024.0);
254

    
255
        put_amf_string(pb, "framerate");
256
        put_amf_double(pb, framerate);
257

    
258
        put_amf_string(pb, "videocodecid");
259
        put_amf_double(pb, video_enc->codec_tag);
260
    }
261

    
262
    if(audio_enc){
263
        put_amf_string(pb, "audiodatarate");
264
        put_amf_double(pb, audio_enc->bit_rate / 1024.0);
265

    
266
        put_amf_string(pb, "audiosamplerate");
267
        put_amf_double(pb, audio_enc->sample_rate);
268

    
269
        put_amf_string(pb, "audiosamplesize");
270
        put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16);
271

    
272
        put_amf_string(pb, "stereo");
273
        put_amf_bool(pb, audio_enc->channels == 2);
274

    
275
        put_amf_string(pb, "audiocodecid");
276
        put_amf_double(pb, audio_enc->codec_tag);
277
    }
278

    
279
    while ((tag = av_metadata_get(s->metadata, "", tag, AV_METADATA_IGNORE_SUFFIX))) {
280
        put_amf_string(pb, tag->key);
281
        avio_w8(pb, AMF_DATA_TYPE_STRING);
282
        put_amf_string(pb, tag->value);
283
    }
284

    
285
    put_amf_string(pb, "filesize");
286
    flv->filesize_offset= avio_tell(pb);
287
    put_amf_double(pb, 0); // delayed write
288

    
289
    put_amf_string(pb, "");
290
    avio_w8(pb, AMF_END_OF_OBJECT);
291

    
292
    /* write total size of tag */
293
    data_size= avio_tell(pb) - metadata_size_pos - 10;
294
    avio_seek(pb, metadata_size_pos, SEEK_SET);
295
    avio_wb24(pb, data_size);
296
    avio_skip(pb, data_size + 10 - 3);
297
    avio_wb32(pb, data_size + 11);
298

    
299
    for (i = 0; i < s->nb_streams; i++) {
300
        AVCodecContext *enc = s->streams[i]->codec;
301
        if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264) {
302
            int64_t pos;
303
            avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
304
                     FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
305
            avio_wb24(pb, 0); // size patched later
306
            avio_wb24(pb, 0); // ts
307
            avio_w8(pb, 0); // ts ext
308
            avio_wb24(pb, 0); // streamid
309
            pos = avio_tell(pb);
310
            if (enc->codec_id == CODEC_ID_AAC) {
311
                avio_w8(pb, get_audio_flags(enc));
312
                avio_w8(pb, 0); // AAC sequence header
313
                avio_write(pb, enc->extradata, enc->extradata_size);
314
            } else {
315
                avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
316
                avio_w8(pb, 0); // AVC sequence header
317
                avio_wb24(pb, 0); // composition time
318
                ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
319
            }
320
            data_size = avio_tell(pb) - pos;
321
            avio_seek(pb, -data_size - 10, SEEK_CUR);
322
            avio_wb24(pb, data_size);
323
            avio_skip(pb, data_size + 10 - 3);
324
            avio_wb32(pb, data_size + 11); // previous tag size
325
        }
326
    }
327

    
328
    return 0;
329
}
330

    
331
static int flv_write_trailer(AVFormatContext *s)
332
{
333
    int64_t file_size;
334

    
335
    AVIOContext *pb = s->pb;
336
    FLVContext *flv = s->priv_data;
337
    int i;
338

    
339
    /* Add EOS tag */
340
    for (i = 0; i < s->nb_streams; i++) {
341
        AVCodecContext *enc = s->streams[i]->codec;
342
        if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
343
                enc->codec_id == CODEC_ID_H264) {
344
            put_avc_eos_tag(pb, flv->last_video_ts);
345
        }
346
    }
347

    
348
    file_size = avio_tell(pb);
349

    
350
    /* update informations */
351
    avio_seek(pb, flv->duration_offset, SEEK_SET);
352
    put_amf_double(pb, flv->duration / (double)1000);
353
    avio_seek(pb, flv->filesize_offset, SEEK_SET);
354
    put_amf_double(pb, file_size);
355

    
356
    avio_seek(pb, file_size, SEEK_SET);
357
    return 0;
358
}
359

    
360
static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
361
{
362
    AVIOContext *pb = s->pb;
363
    AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
364
    FLVContext *flv = s->priv_data;
365
    unsigned ts;
366
    int size= pkt->size;
367
    uint8_t *data= NULL;
368
    int flags, flags_size;
369

    
370
//    av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
371

    
372
    if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
373
       enc->codec_id == CODEC_ID_AAC)
374
        flags_size= 2;
375
    else if(enc->codec_id == CODEC_ID_H264)
376
        flags_size= 5;
377
    else
378
        flags_size= 1;
379

    
380
    if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
381
        avio_w8(pb, FLV_TAG_TYPE_VIDEO);
382

    
383
        flags = enc->codec_tag;
384
        if(flags == 0) {
385
            av_log(enc, AV_LOG_ERROR, "video codec %X not compatible with flv\n",enc->codec_id);
386
            return -1;
387
        }
388

    
389
        flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
390
    } else {
391
        assert(enc->codec_type == AVMEDIA_TYPE_AUDIO);
392
        flags = get_audio_flags(enc);
393

    
394
        assert(size);
395

    
396
        avio_w8(pb, FLV_TAG_TYPE_AUDIO);
397
    }
398

    
399
    if (enc->codec_id == CODEC_ID_H264) {
400
        /* check if extradata looks like mp4 formated */
401
        if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
402
            if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
403
                return -1;
404
        }
405
        if (!flv->delay && pkt->dts < 0)
406
            flv->delay = -pkt->dts;
407
    } else if (enc->codec_id == CODEC_ID_AAC && pkt->size > 2 &&
408
               (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
409
        av_log(s, AV_LOG_ERROR, "malformated aac bitstream, use -absf aac_adtstoasc\n");
410
        return -1;
411
    }
412

    
413
    ts = pkt->dts + flv->delay; // add delay to force positive dts
414
    if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
415
        if (flv->last_video_ts < ts)
416
            flv->last_video_ts = ts;
417
    }
418
    avio_wb24(pb,size + flags_size);
419
    avio_wb24(pb,ts);
420
    avio_w8(pb,(ts >> 24) & 0x7F); // timestamps are 32bits _signed_
421
    avio_wb24(pb,flv->reserved);
422
    avio_w8(pb,flags);
423
    if (enc->codec_id == CODEC_ID_VP6)
424
        avio_w8(pb,0);
425
    if (enc->codec_id == CODEC_ID_VP6F)
426
        avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
427
    else if (enc->codec_id == CODEC_ID_AAC)
428
        avio_w8(pb,1); // AAC raw
429
    else if (enc->codec_id == CODEC_ID_H264) {
430
        avio_w8(pb,1); // AVC NALU
431
        avio_wb24(pb,pkt->pts - pkt->dts);
432
    }
433

    
434
    avio_write(pb, data ? data : pkt->data, size);
435

    
436
    avio_wb32(pb,size+flags_size+11); // previous tag size
437
    flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
438

    
439
    avio_flush(pb);
440

    
441
    av_free(data);
442

    
443
    return 0;
444
}
445

    
446
AVOutputFormat ff_flv_muxer = {
447
    "flv",
448
    NULL_IF_CONFIG_SMALL("FLV format"),
449
    "video/x-flv",
450
    "flv",
451
    sizeof(FLVContext),
452
#if CONFIG_LIBMP3LAME
453
    CODEC_ID_MP3,
454
#else // CONFIG_LIBMP3LAME
455
    CODEC_ID_ADPCM_SWF,
456
#endif // CONFIG_LIBMP3LAME
457
    CODEC_ID_FLV1,
458
    flv_write_header,
459
    flv_write_packet,
460
    flv_write_trailer,
461
    .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
462
    .flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
463
};