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FFmpeg/libavformat/flvenc.c

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/*
* FLV muxer
* Copyright (c) 2003 The FFmpeg Project
*
* 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 "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "libavutil/intfloat.h"
#include "libavutil/avassert.h"
#include "libavutil/mathematics.h"
#include "libavcodec/codec_desc.h"
#include "libavcodec/mpeg4audio.h"
#include "avio.h"
#include "avc.h"
#include "av1.h"
#include "vpcc.h"
#include "hevc.h"
#include "avformat.h"
#include "flv.h"
#include "internal.h"
#include "mux.h"
#include "libavutil/opt.h"
#include "libavcodec/put_bits.h"
static const AVCodecTag flv_video_codec_ids[] = {
{ AV_CODEC_ID_FLV1, FLV_CODECID_H263 },
{ AV_CODEC_ID_H263, FLV_CODECID_REALH263 },
{ AV_CODEC_ID_MPEG4, FLV_CODECID_MPEG4 },
{ AV_CODEC_ID_FLASHSV, FLV_CODECID_SCREEN },
{ AV_CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2 },
{ AV_CODEC_ID_VP6F, FLV_CODECID_VP6 },
{ AV_CODEC_ID_VP6, FLV_CODECID_VP6 },
{ AV_CODEC_ID_VP6A, FLV_CODECID_VP6A },
{ AV_CODEC_ID_H264, FLV_CODECID_H264 },
{ AV_CODEC_ID_HEVC, MKBETAG('h', 'v', 'c', '1') },
{ AV_CODEC_ID_AV1, MKBETAG('a', 'v', '0', '1') },
{ AV_CODEC_ID_VP9, MKBETAG('v', 'p', '0', '9') },
{ AV_CODEC_ID_NONE, 0 }
};
static const AVCodecTag flv_audio_codec_ids[] = {
{ AV_CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET },
{ AV_CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
{ AV_CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
{ AV_CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET },
{ AV_CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET },
{ AV_CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET },
{ AV_CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET },
{ AV_CODEC_ID_PCM_MULAW, FLV_CODECID_PCM_MULAW >> FLV_AUDIO_CODECID_OFFSET },
{ AV_CODEC_ID_PCM_ALAW, FLV_CODECID_PCM_ALAW >> FLV_AUDIO_CODECID_OFFSET },
{ AV_CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET },
{ AV_CODEC_ID_NONE, 0 }
};
typedef enum {
FLV_AAC_SEQ_HEADER_DETECT = (1 << 0),
FLV_NO_SEQUENCE_END = (1 << 1),
FLV_ADD_KEYFRAME_INDEX = (1 << 2),
FLV_NO_METADATA = (1 << 3),
FLV_NO_DURATION_FILESIZE = (1 << 4),
} FLVFlags;
typedef struct FLVFileposition {
int64_t keyframe_position;
double keyframe_timestamp;
struct FLVFileposition *next;
} FLVFileposition;
typedef struct FLVContext {
AVClass *av_class;
int reserved;
int64_t duration_offset;
int64_t filesize_offset;
int64_t duration;
int64_t delay; ///< first dts delay (needed for AVC & Speex)
int64_t datastart_offset;
int64_t datasize_offset;
int64_t datasize;
int64_t videosize_offset;
int64_t videosize;
int64_t audiosize_offset;
int64_t audiosize;
int64_t metadata_size_pos;
int64_t metadata_totalsize_pos;
int64_t metadata_totalsize;
int64_t keyframe_index_size;
int64_t lasttimestamp_offset;
double lasttimestamp;
int64_t lastkeyframetimestamp_offset;
double lastkeyframetimestamp;
int64_t lastkeyframelocation_offset;
int64_t lastkeyframelocation;
int64_t keyframes_info_offset;
int64_t filepositions_count;
FLVFileposition *filepositions;
FLVFileposition *head_filepositions;
AVCodecParameters *audio_par;
AVCodecParameters *video_par;
double framerate;
AVCodecParameters *data_par;
int flags;
int64_t last_ts[FLV_STREAM_TYPE_NB];
} FLVContext;
static int get_audio_flags(AVFormatContext *s, AVCodecParameters *par)
{
int flags = (par->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT
: FLV_SAMPLESSIZE_8BIT;
if (par->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |
FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
else if (par->codec_id == AV_CODEC_ID_SPEEX) {
if (par->sample_rate != 16000) {
av_log(s, AV_LOG_ERROR,
"FLV only supports wideband (16kHz) Speex audio\n");
return AVERROR(EINVAL);
}
if (par->ch_layout.nb_channels != 1) {
av_log(s, AV_LOG_ERROR, "FLV only supports mono Speex audio\n");
return AVERROR(EINVAL);
}
return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
} else {
switch (par->sample_rate) {
case 48000:
// 48khz mp3 is stored with 44k1 samplerate identifer
if (par->codec_id == AV_CODEC_ID_MP3) {
flags |= FLV_SAMPLERATE_44100HZ;
break;
} else {
goto error;
}
case 44100:
flags |= FLV_SAMPLERATE_44100HZ;
break;
case 22050:
flags |= FLV_SAMPLERATE_22050HZ;
break;
case 11025:
flags |= FLV_SAMPLERATE_11025HZ;
break;
case 16000: // nellymoser only
case 8000: // nellymoser only
case 5512: // not MP3
if (par->codec_id != AV_CODEC_ID_MP3) {
flags |= FLV_SAMPLERATE_SPECIAL;
break;
}
default:
error:
av_log(s, AV_LOG_ERROR,
"FLV does not support sample rate %d, "
"choose from (44100, 22050, 11025)\n", par->sample_rate);
return AVERROR(EINVAL);
}
}
if (par->ch_layout.nb_channels > 1)
flags |= FLV_STEREO;
switch (par->codec_id) {
case AV_CODEC_ID_MP3:
flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
break;
case AV_CODEC_ID_PCM_U8:
flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
break;
case AV_CODEC_ID_PCM_S16BE:
flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
break;
case AV_CODEC_ID_PCM_S16LE:
flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
break;
case AV_CODEC_ID_ADPCM_SWF:
flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
break;
case AV_CODEC_ID_NELLYMOSER:
if (par->sample_rate == 8000)
flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
else if (par->sample_rate == 16000)
flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
else
flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
break;
case AV_CODEC_ID_PCM_MULAW:
flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
break;
case AV_CODEC_ID_PCM_ALAW:
flags = FLV_CODECID_PCM_ALAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
break;
case 0:
flags |= par->codec_tag << 4;
break;
default:
av_log(s, AV_LOG_ERROR, "Audio codec '%s' not compatible with FLV\n",
avcodec_get_name(par->codec_id));
return AVERROR(EINVAL);
}
return flags;
}
static void put_amf_string(AVIOContext *pb, const char *str)
{
size_t len = strlen(str);
avio_wb16(pb, len);
avio_write(pb, str, len);
}
// FLV timestamps are 32 bits signed, RTMP timestamps should be 32-bit unsigned
static void put_timestamp(AVIOContext *pb, int64_t ts) {
avio_wb24(pb, ts & 0xFFFFFF);
avio_w8(pb, (ts >> 24) & 0x7F);
}
static void put_eos_tag(AVIOContext *pb, unsigned ts, enum AVCodecID codec_id)
{
uint32_t tag = ff_codec_get_tag(flv_video_codec_ids, codec_id);
/* ub[4] FrameType = 1, ub[4] CodecId */
tag |= 1 << 4;
avio_w8(pb, FLV_TAG_TYPE_VIDEO);
avio_wb24(pb, 5); /* Tag Data Size */
put_timestamp(pb, ts);
avio_wb24(pb, 0); /* StreamId = 0 */
avio_w8(pb, tag);
avio_w8(pb, 2); /* AVC end of sequence */
avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
avio_wb32(pb, 16); /* Size of FLV tag */
}
static void put_amf_double(AVIOContext *pb, double d)
{
avio_w8(pb, AMF_DATA_TYPE_NUMBER);
avio_wb64(pb, av_double2int(d));
}
static void put_amf_byte(AVIOContext *pb, unsigned char abyte)
{
avio_w8(pb, abyte);
}
static void put_amf_dword_array(AVIOContext *pb, uint32_t dw)
{
avio_w8(pb, AMF_DATA_TYPE_ARRAY);
avio_wb32(pb, dw);
}
static void put_amf_bool(AVIOContext *pb, int b)
{
avio_w8(pb, AMF_DATA_TYPE_BOOL);
avio_w8(pb, !!b);
}
static void write_metadata(AVFormatContext *s, unsigned int ts)
{
AVIOContext *pb = s->pb;
FLVContext *flv = s->priv_data;
int write_duration_filesize = !(flv->flags & FLV_NO_DURATION_FILESIZE);
int metadata_count = 0;
int64_t metadata_count_pos;
const AVDictionaryEntry *tag = NULL;
/* write meta_tag */
avio_w8(pb, FLV_TAG_TYPE_META); // tag type META
flv->metadata_size_pos = avio_tell(pb);
avio_wb24(pb, 0); // size of data part (sum of all parts below)
put_timestamp(pb, ts); // timestamp
avio_wb24(pb, 0); // reserved
/* now data of data_size size */
/* first event name as a string */
avio_w8(pb, AMF_DATA_TYPE_STRING);
put_amf_string(pb, "onMetaData"); // 12 bytes
/* mixed array (hash) with size and string/type/data tuples */
avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
metadata_count_pos = avio_tell(pb);
metadata_count = 4 * !!flv->video_par +
5 * !!flv->audio_par +
1 * !!flv->data_par;
if (write_duration_filesize) {
metadata_count += 2; // +2 for duration and file size
}
avio_wb32(pb, metadata_count);
if (write_duration_filesize) {
put_amf_string(pb, "duration");
flv->duration_offset = avio_tell(pb);
// fill in the guessed duration, it'll be corrected later if incorrect
put_amf_double(pb, s->duration / AV_TIME_BASE);
}
if (flv->video_par) {
put_amf_string(pb, "width");
put_amf_double(pb, flv->video_par->width);
put_amf_string(pb, "height");
put_amf_double(pb, flv->video_par->height);
put_amf_string(pb, "videodatarate");
put_amf_double(pb, flv->video_par->bit_rate / 1024.0);
if (flv->framerate != 0.0) {
put_amf_string(pb, "framerate");
put_amf_double(pb, flv->framerate);
metadata_count++;
}
put_amf_string(pb, "videocodecid");
put_amf_double(pb, flv->video_par->codec_tag);
}
if (flv->audio_par) {
put_amf_string(pb, "audiodatarate");
put_amf_double(pb, flv->audio_par->bit_rate / 1024.0);
put_amf_string(pb, "audiosamplerate");
put_amf_double(pb, flv->audio_par->sample_rate);
put_amf_string(pb, "audiosamplesize");
put_amf_double(pb, flv->audio_par->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);
put_amf_string(pb, "stereo");
put_amf_bool(pb, flv->audio_par->ch_layout.nb_channels == 2);
put_amf_string(pb, "audiocodecid");
put_amf_double(pb, flv->audio_par->codec_tag);
}
if (flv->data_par) {
put_amf_string(pb, "datastream");
put_amf_double(pb, 0.0);
}
ff_standardize_creation_time(s);
while ((tag = av_dict_iterate(s->metadata, tag))) {
if( !strcmp(tag->key, "width")
||!strcmp(tag->key, "height")
||!strcmp(tag->key, "videodatarate")
||!strcmp(tag->key, "framerate")
||!strcmp(tag->key, "videocodecid")
||!strcmp(tag->key, "audiodatarate")
||!strcmp(tag->key, "audiosamplerate")
||!strcmp(tag->key, "audiosamplesize")
||!strcmp(tag->key, "stereo")
||!strcmp(tag->key, "audiocodecid")
||!strcmp(tag->key, "duration")
||!strcmp(tag->key, "onMetaData")
||!strcmp(tag->key, "datasize")
||!strcmp(tag->key, "lasttimestamp")
||!strcmp(tag->key, "totalframes")
||!strcmp(tag->key, "hasAudio")
||!strcmp(tag->key, "hasVideo")
||!strcmp(tag->key, "hasCuePoints")
||!strcmp(tag->key, "hasMetadata")
||!strcmp(tag->key, "hasKeyframes")
){
av_log(s, AV_LOG_DEBUG, "Ignoring metadata for %s\n", tag->key);
continue;
}
put_amf_string(pb, tag->key);
avio_w8(pb, AMF_DATA_TYPE_STRING);
put_amf_string(pb, tag->value);
metadata_count++;
}
if (write_duration_filesize) {
put_amf_string(pb, "filesize");
flv->filesize_offset = avio_tell(pb);
put_amf_double(pb, 0); // delayed write
}
if (flv->flags & FLV_ADD_KEYFRAME_INDEX) {
flv->keyframe_index_size = 0;
put_amf_string(pb, "hasVideo");
put_amf_bool(pb, !!flv->video_par);
metadata_count++;
put_amf_string(pb, "hasKeyframes");
put_amf_bool(pb, 1);
metadata_count++;
put_amf_string(pb, "hasAudio");
put_amf_bool(pb, !!flv->audio_par);
metadata_count++;
put_amf_string(pb, "hasMetadata");
put_amf_bool(pb, 1);
metadata_count++;
put_amf_string(pb, "canSeekToEnd");
put_amf_bool(pb, 1);
metadata_count++;
put_amf_string(pb, "datasize");
flv->datasize_offset = avio_tell(pb);
flv->datasize = 0;
put_amf_double(pb, flv->datasize);
metadata_count++;
put_amf_string(pb, "videosize");
flv->videosize_offset = avio_tell(pb);
flv->videosize = 0;
put_amf_double(pb, flv->videosize);
metadata_count++;
put_amf_string(pb, "audiosize");
flv->audiosize_offset = avio_tell(pb);
flv->audiosize = 0;
put_amf_double(pb, flv->audiosize);
metadata_count++;
put_amf_string(pb, "lasttimestamp");
flv->lasttimestamp_offset = avio_tell(pb);
flv->lasttimestamp = 0;
put_amf_double(pb, 0);
metadata_count++;
put_amf_string(pb, "lastkeyframetimestamp");
flv->lastkeyframetimestamp_offset = avio_tell(pb);
flv->lastkeyframetimestamp = 0;
put_amf_double(pb, 0);
metadata_count++;
put_amf_string(pb, "lastkeyframelocation");
flv->lastkeyframelocation_offset = avio_tell(pb);
flv->lastkeyframelocation = 0;
put_amf_double(pb, 0);
metadata_count++;
put_amf_string(pb, "keyframes");
put_amf_byte(pb, AMF_DATA_TYPE_OBJECT);
metadata_count++;
flv->keyframes_info_offset = avio_tell(pb);
}
put_amf_string(pb, "");
avio_w8(pb, AMF_END_OF_OBJECT);
/* write total size of tag */
flv->metadata_totalsize = avio_tell(pb) - flv->metadata_size_pos - 10;
avio_seek(pb, metadata_count_pos, SEEK_SET);
avio_wb32(pb, metadata_count);
avio_seek(pb, flv->metadata_size_pos, SEEK_SET);
avio_wb24(pb, flv->metadata_totalsize);
avio_skip(pb, flv->metadata_totalsize + 10 - 3);
flv->metadata_totalsize_pos = avio_tell(pb);
avio_wb32(pb, flv->metadata_totalsize + 11);
}
static int unsupported_codec(AVFormatContext *s,
const char* type, int codec_id)
{
const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id);
av_log(s, AV_LOG_ERROR,
"%s codec %s not compatible with flv\n",
type,
desc ? desc->name : "unknown");
return AVERROR(ENOSYS);
}
static void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par, int64_t ts) {
int64_t data_size;
AVIOContext *pb = s->pb;
FLVContext *flv = s->priv_data;
if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
|| par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC
|| par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) {
int64_t pos;
avio_w8(pb,
par->codec_type == AVMEDIA_TYPE_VIDEO ?
FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
avio_wb24(pb, 0); // size patched later
put_timestamp(pb, ts);
avio_wb24(pb, 0); // streamid
pos = avio_tell(pb);
if (par->codec_id == AV_CODEC_ID_AAC) {
avio_w8(pb, get_audio_flags(s, par));
avio_w8(pb, 0); // AAC sequence header
if (!par->extradata_size && (flv->flags & FLV_AAC_SEQ_HEADER_DETECT)) {
PutBitContext pbc;
int samplerate_index;
int channels = par->ch_layout.nb_channels
- (par->ch_layout.nb_channels == 8 ? 1 : 0);
uint8_t data[2];
for (samplerate_index = 0; samplerate_index < 16;
samplerate_index++)
if (par->sample_rate
== ff_mpeg4audio_sample_rates[samplerate_index])
break;
init_put_bits(&pbc, data, sizeof(data));
put_bits(&pbc, 5, par->profile + 1); //profile
put_bits(&pbc, 4, samplerate_index); //sample rate index
put_bits(&pbc, 4, channels);
put_bits(&pbc, 1, 0); //frame length - 1024 samples
put_bits(&pbc, 1, 0); //does not depend on core coder
put_bits(&pbc, 1, 0); //is not extension
flush_put_bits(&pbc);
avio_w8(pb, data[0]);
avio_w8(pb, data[1]);
av_log(s, AV_LOG_WARNING, "AAC sequence header: %02x %02x.\n",
data[0], data[1]);
}
avio_write(pb, par->extradata, par->extradata_size);
} else {
if (par->codec_id == AV_CODEC_ID_HEVC) {
avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeSequenceStart | FLV_FRAME_KEY); // ExVideoTagHeader mode with PacketTypeSequenceStart
avio_write(pb, "hvc1", 4);
} else if (par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) {
avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeSequenceStart | FLV_FRAME_KEY);
avio_write(pb, par->codec_id == AV_CODEC_ID_AV1 ? "av01" : "vp09", 4);
} else {
avio_w8(pb, par->codec_tag | FLV_FRAME_KEY); // flags
avio_w8(pb, 0); // AVC sequence header
avio_wb24(pb, 0); // composition time
}
if (par->codec_id == AV_CODEC_ID_HEVC)
ff_isom_write_hvcc(pb, par->extradata, par->extradata_size, 0);
else if (par->codec_id == AV_CODEC_ID_AV1)
ff_isom_write_av1c(pb, par->extradata, par->extradata_size, 1);
else if (par->codec_id == AV_CODEC_ID_VP9)
ff_isom_write_vpcc(s, pb, par->extradata, par->extradata_size, par);
else
ff_isom_write_avcc(pb, par->extradata, par->extradata_size);
}
data_size = avio_tell(pb) - pos;
avio_seek(pb, -data_size - 10, SEEK_CUR);
avio_wb24(pb, data_size);
avio_skip(pb, data_size + 10 - 3);
avio_wb32(pb, data_size + 11); // previous tag size
}
}
static int flv_append_keyframe_info(AVFormatContext *s, FLVContext *flv, double ts, int64_t pos)
{
FLVFileposition *position = av_malloc(sizeof(FLVFileposition));
if (!position) {
av_log(s, AV_LOG_WARNING, "no mem for add keyframe index!\n");
return AVERROR(ENOMEM);
}
position->keyframe_timestamp = ts;
position->keyframe_position = pos;
if (!flv->filepositions_count) {
flv->filepositions = position;
flv->head_filepositions = flv->filepositions;
position->next = NULL;
} else {
flv->filepositions->next = position;
position->next = NULL;
flv->filepositions = flv->filepositions->next;
}
flv->filepositions_count++;
return 0;
}
static int shift_data(AVFormatContext *s)
{
int ret;
int64_t metadata_size = 0;
FLVContext *flv = s->priv_data;
metadata_size = flv->filepositions_count * 9 * 2 + 10; /* filepositions and times value */
metadata_size += 2 + 13; /* filepositions String */
metadata_size += 2 + 5; /* times String */
metadata_size += 3; /* Object end */
flv->keyframe_index_size = metadata_size;
if (metadata_size < 0)
return metadata_size;
ret = ff_format_shift_data(s, flv->keyframes_info_offset, metadata_size);
if (ret < 0)
return ret;
avio_seek(s->pb, flv->metadata_size_pos, SEEK_SET);
avio_wb24(s->pb, flv->metadata_totalsize + metadata_size);
avio_seek(s->pb, flv->metadata_totalsize_pos + metadata_size, SEEK_SET);
avio_wb32(s->pb, flv->metadata_totalsize + 11 + metadata_size);
return 0;
}
static int flv_init(struct AVFormatContext *s)
{
int i;
FLVContext *flv = s->priv_data;
if (s->nb_streams > FLV_STREAM_TYPE_NB) {
av_log(s, AV_LOG_ERROR, "invalid number of streams %d\n",
s->nb_streams);
return AVERROR(EINVAL);
}
for (i = 0; i < s->nb_streams; i++) {
AVCodecParameters *par = s->streams[i]->codecpar;
switch (par->codec_type) {
case AVMEDIA_TYPE_VIDEO:
if (s->streams[i]->avg_frame_rate.den &&
s->streams[i]->avg_frame_rate.num) {
flv->framerate = av_q2d(s->streams[i]->avg_frame_rate);
}
if (flv->video_par) {
av_log(s, AV_LOG_ERROR,
"at most one video stream is supported in flv\n");
return AVERROR(EINVAL);
}
flv->video_par = par;
if (!ff_codec_get_tag(flv_video_codec_ids, par->codec_id))
return unsupported_codec(s, "Video", par->codec_id);
if (par->codec_id == AV_CODEC_ID_MPEG4 ||
par->codec_id == AV_CODEC_ID_H263) {
int error = s->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL;
av_log(s, error ? AV_LOG_ERROR : AV_LOG_WARNING,
"Codec %s is not supported in the official FLV specification,\n", avcodec_get_name(par->codec_id));
if (error) {
av_log(s, AV_LOG_ERROR,
"use vstrict=-1 / -strict -1 to use it anyway.\n");
return AVERROR(EINVAL);
}
} else if (par->codec_id == AV_CODEC_ID_VP6) {
av_log(s, AV_LOG_WARNING,
"Muxing VP6 in flv will produce flipped video on playback.\n");
}
break;
case AVMEDIA_TYPE_AUDIO:
if (flv->audio_par) {
av_log(s, AV_LOG_ERROR,
"at most one audio stream is supported in flv\n");
return AVERROR(EINVAL);
}
flv->audio_par = par;
if (get_audio_flags(s, par) < 0)
return unsupported_codec(s, "Audio", par->codec_id);
if (par->codec_id == AV_CODEC_ID_PCM_S16BE)
av_log(s, AV_LOG_WARNING,
"16-bit big-endian audio in flv is valid but most likely unplayable (hardware dependent); use s16le\n");
break;
case AVMEDIA_TYPE_DATA:
if (par->codec_id != AV_CODEC_ID_TEXT && par->codec_id != AV_CODEC_ID_NONE)
return unsupported_codec(s, "Data", par->codec_id);
flv->data_par = par;
break;
case AVMEDIA_TYPE_SUBTITLE:
if (par->codec_id != AV_CODEC_ID_TEXT) {
av_log(s, AV_LOG_ERROR, "Subtitle codec '%s' for stream %d is not compatible with FLV\n",
avcodec_get_name(par->codec_id), i);
return AVERROR_INVALIDDATA;
}
flv->data_par = par;
break;
default:
av_log(s, AV_LOG_ERROR, "Codec type '%s' for stream %d is not compatible with FLV\n",
av_get_media_type_string(par->codec_type), i);
return AVERROR(EINVAL);
}
avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
flv->last_ts[i] = -1;
}
flv->delay = AV_NOPTS_VALUE;
return 0;
}
static int flv_write_header(AVFormatContext *s)
{
int i;
AVIOContext *pb = s->pb;
FLVContext *flv = s->priv_data;
avio_write(pb, "FLV", 3);
avio_w8(pb, 1);
avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!flv->audio_par +
FLV_HEADER_FLAG_HASVIDEO * !!flv->video_par);
avio_wb32(pb, 9);
avio_wb32(pb, 0);
for (i = 0; i < s->nb_streams; i++)
if (s->streams[i]->codecpar->codec_tag == 5) {
avio_w8(pb, 8); // message type
avio_wb24(pb, 0); // include flags
avio_wb24(pb, 0); // time stamp
avio_wb32(pb, 0); // reserved
avio_wb32(pb, 11); // size
flv->reserved = 5;
}
if (flv->flags & FLV_NO_METADATA) {
pb->seekable = 0;
} else {
write_metadata(s, 0);
}
for (i = 0; i < s->nb_streams; i++) {
flv_write_codec_header(s, s->streams[i]->codecpar, 0);
}
flv->datastart_offset = avio_tell(pb);
return 0;
}
static int flv_write_trailer(AVFormatContext *s)
{
int64_t file_size;
AVIOContext *pb = s->pb;
FLVContext *flv = s->priv_data;
int build_keyframes_idx = flv->flags & FLV_ADD_KEYFRAME_INDEX;
int i, res;
int64_t cur_pos = avio_tell(s->pb);
if (build_keyframes_idx) {
const FLVFileposition *newflv_posinfo;
avio_seek(pb, flv->videosize_offset, SEEK_SET);
put_amf_double(pb, flv->videosize);
avio_seek(pb, flv->audiosize_offset, SEEK_SET);
put_amf_double(pb, flv->audiosize);
avio_seek(pb, flv->lasttimestamp_offset, SEEK_SET);
put_amf_double(pb, flv->lasttimestamp);
avio_seek(pb, flv->lastkeyframetimestamp_offset, SEEK_SET);
put_amf_double(pb, flv->lastkeyframetimestamp);
avio_seek(pb, flv->lastkeyframelocation_offset, SEEK_SET);
put_amf_double(pb, flv->lastkeyframelocation + flv->keyframe_index_size);
avio_seek(pb, cur_pos, SEEK_SET);
res = shift_data(s);
if (res < 0) {
goto end;
}
avio_seek(pb, flv->keyframes_info_offset, SEEK_SET);
put_amf_string(pb, "filepositions");
put_amf_dword_array(pb, flv->filepositions_count);
for (newflv_posinfo = flv->head_filepositions; newflv_posinfo; newflv_posinfo = newflv_posinfo->next) {
put_amf_double(pb, newflv_posinfo->keyframe_position + flv->keyframe_index_size);
}
put_amf_string(pb, "times");
put_amf_dword_array(pb, flv->filepositions_count);
for (newflv_posinfo = flv->head_filepositions; newflv_posinfo; newflv_posinfo = newflv_posinfo->next) {
put_amf_double(pb, newflv_posinfo->keyframe_timestamp);
}
put_amf_string(pb, "");
avio_w8(pb, AMF_END_OF_OBJECT);
avio_seek(pb, cur_pos + flv->keyframe_index_size, SEEK_SET);
}
end:
if (flv->flags & FLV_NO_SEQUENCE_END) {
av_log(s, AV_LOG_DEBUG, "FLV no sequence end mode open\n");
} else {
/* Add EOS tag */
for (i = 0; i < s->nb_streams; i++) {
AVCodecParameters *par = s->streams[i]->codecpar;
if (par->codec_type == AVMEDIA_TYPE_VIDEO &&
(par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4))
put_eos_tag(pb, flv->last_ts[i], par->codec_id);
}
}
file_size = avio_tell(pb);
if (build_keyframes_idx) {
flv->datasize = file_size - flv->datastart_offset;
avio_seek(pb, flv->datasize_offset, SEEK_SET);
put_amf_double(pb, flv->datasize);
}
if (!(flv->flags & FLV_NO_METADATA)) {
if (!(flv->flags & FLV_NO_DURATION_FILESIZE)) {
/* update information */
if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0) {
av_log(s, AV_LOG_WARNING, "Failed to update header with correct duration.\n");
} else {
put_amf_double(pb, flv->duration / (double)1000);
}
if (avio_seek(pb, flv->filesize_offset, SEEK_SET) < 0) {
av_log(s, AV_LOG_WARNING, "Failed to update header with correct filesize.\n");
} else {
put_amf_double(pb, file_size);
}
}
}
return 0;
}
static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVIOContext *pb = s->pb;
AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
FLVContext *flv = s->priv_data;
unsigned ts;
int size = pkt->size;
uint8_t *data = NULL;
uint8_t frametype = pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
int flags = -1, flags_size, ret = 0;
int64_t cur_offset = avio_tell(pb);
if (par->codec_type == AVMEDIA_TYPE_AUDIO && !pkt->size) {
av_log(s, AV_LOG_WARNING, "Empty audio Packet\n");
return AVERROR(EINVAL);
}
if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A ||
par->codec_id == AV_CODEC_ID_VP6 || par->codec_id == AV_CODEC_ID_AAC)
flags_size = 2;
else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 ||
par->codec_id == AV_CODEC_ID_HEVC || par->codec_id == AV_CODEC_ID_AV1 ||
par->codec_id == AV_CODEC_ID_VP9)
flags_size = 5;
else
flags_size = 1;
if (par->codec_id == AV_CODEC_ID_HEVC && pkt->pts != pkt->dts)
flags_size += 3;
if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264
|| par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC
|| par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) {
size_t side_size;
uint8_t *side = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &side_size);
if (side && side_size > 0 && (side_size != par->extradata_size || memcmp(side, par->extradata, side_size))) {
ret = ff_alloc_extradata(par, side_size);
if (ret < 0)
return ret;
memcpy(par->extradata, side, side_size);
flv_write_codec_header(s, par, pkt->dts);
}
}
if (flv->delay == AV_NOPTS_VALUE)
flv->delay = -pkt->dts;
if (pkt->dts < -flv->delay) {
av_log(s, AV_LOG_WARNING,
"Packets are not in the proper order with respect to DTS\n");
return AVERROR(EINVAL);
}
if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 ||
par->codec_id == AV_CODEC_ID_HEVC || par->codec_id == AV_CODEC_ID_AV1 ||
par->codec_id == AV_CODEC_ID_VP9) {
if (pkt->pts == AV_NOPTS_VALUE) {
av_log(s, AV_LOG_ERROR, "Packet is missing PTS\n");
return AVERROR(EINVAL);
}
}
ts = pkt->dts;
if (s->event_flags & AVSTREAM_EVENT_FLAG_METADATA_UPDATED) {
write_metadata(s, ts);
s->event_flags &= ~AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
}
avio_write_marker(pb, av_rescale(ts, AV_TIME_BASE, 1000),
pkt->flags & AV_PKT_FLAG_KEY && (flv->video_par ? par->codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT);
switch (par->codec_type) {
case AVMEDIA_TYPE_VIDEO:
avio_w8(pb, FLV_TAG_TYPE_VIDEO);
flags = ff_codec_get_tag(flv_video_codec_ids, par->codec_id);
flags |= frametype;
break;
case AVMEDIA_TYPE_AUDIO:
flags = get_audio_flags(s, par);
av_assert0(size);
avio_w8(pb, FLV_TAG_TYPE_AUDIO);
break;
case AVMEDIA_TYPE_SUBTITLE:
case AVMEDIA_TYPE_DATA:
avio_w8(pb, FLV_TAG_TYPE_META);
break;
default:
return AVERROR(EINVAL);
}
if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) {
/* check if extradata looks like mp4 formatted */
if (par->extradata_size > 0 && *(uint8_t*)par->extradata != 1)
if ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)
return ret;
} else if (par->codec_id == AV_CODEC_ID_HEVC) {
if (par->extradata_size > 0 && *(uint8_t*)par->extradata != 1)
if ((ret = ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL)) < 0)
return ret;
} else if (par->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
(AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
if (!s->streams[pkt->stream_index]->nb_frames) {
av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
"use the audio bitstream filter 'aac_adtstoasc' to fix it "
"('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
return AVERROR_INVALIDDATA;
}
av_log(s, AV_LOG_WARNING, "aac bitstream error\n");
}
/* check Speex packet duration */
if (par->codec_id == AV_CODEC_ID_SPEEX && ts - flv->last_ts[pkt->stream_index] > 160)
av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
"8 frames per packet. Adobe Flash "
"Player cannot handle this!\n");
if (flv->last_ts[pkt->stream_index] < ts)
flv->last_ts[pkt->stream_index] = ts;
if (size + flags_size >= 1<<24) {
av_log(s, AV_LOG_ERROR, "Too large packet with size %u >= %u\n",
size + flags_size, 1<<24);
ret = AVERROR(EINVAL);
goto fail;
}
avio_wb24(pb, size + flags_size);
put_timestamp(pb, ts);
avio_wb24(pb, flv->reserved);
if (par->codec_type == AVMEDIA_TYPE_DATA ||
par->codec_type == AVMEDIA_TYPE_SUBTITLE ) {
int data_size;
int64_t metadata_size_pos = avio_tell(pb);
if (par->codec_id == AV_CODEC_ID_TEXT) {
// legacy FFmpeg magic?
avio_w8(pb, AMF_DATA_TYPE_STRING);
put_amf_string(pb, "onTextData");
avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
avio_wb32(pb, 2);
put_amf_string(pb, "type");
avio_w8(pb, AMF_DATA_TYPE_STRING);
put_amf_string(pb, "Text");
put_amf_string(pb, "text");
avio_w8(pb, AMF_DATA_TYPE_STRING);
put_amf_string(pb, pkt->data);
put_amf_string(pb, "");
avio_w8(pb, AMF_END_OF_OBJECT);
} else {
// just pass the metadata through
avio_write(pb, data ? data : pkt->data, size);
}
/* write total size of tag */
data_size = avio_tell(pb) - metadata_size_pos;
avio_seek(pb, metadata_size_pos - 10, SEEK_SET);
avio_wb24(pb, data_size);
avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
avio_wb32(pb, data_size + 11);
} else {
av_assert1(flags>=0);
if (par->codec_id == AV_CODEC_ID_HEVC) {
int pkttype = (pkt->pts != pkt->dts) ? PacketTypeCodedFrames : PacketTypeCodedFramesX;
avio_w8(pb, FLV_IS_EX_HEADER | pkttype | frametype); // ExVideoTagHeader mode with PacketTypeCodedFrames(X)
avio_write(pb, "hvc1", 4);
if (pkttype == PacketTypeCodedFrames)
avio_wb24(pb, pkt->pts - pkt->dts);
} else if (par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) {
avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeCodedFrames | frametype);
avio_write(pb, par->codec_id == AV_CODEC_ID_AV1 ? "av01" : "vp09", 4);
} else {
avio_w8(pb, flags);
}
if (par->codec_id == AV_CODEC_ID_VP6)
avio_w8(pb,0);
if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A) {
if (par->extradata_size)
avio_w8(pb, par->extradata[0]);
else
avio_w8(pb, ((FFALIGN(par->width, 16) - par->width) << 4) |
(FFALIGN(par->height, 16) - par->height));
} else if (par->codec_id == AV_CODEC_ID_AAC)
avio_w8(pb, 1); // AAC raw
else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) {
avio_w8(pb, 1); // AVC NALU
avio_wb24(pb, pkt->pts - pkt->dts);
}
avio_write(pb, data ? data : pkt->data, size);
avio_wb32(pb, size + flags_size + 11); // previous tag size
flv->duration = FFMAX(flv->duration,
pkt->pts + flv->delay + pkt->duration);
}
if (flv->flags & FLV_ADD_KEYFRAME_INDEX) {
switch (par->codec_type) {
case AVMEDIA_TYPE_VIDEO:
flv->videosize += (avio_tell(pb) - cur_offset);
flv->lasttimestamp = pkt->dts / 1000.0;
if (pkt->flags & AV_PKT_FLAG_KEY) {
flv->lastkeyframetimestamp = flv->lasttimestamp;
flv->lastkeyframelocation = cur_offset;
ret = flv_append_keyframe_info(s, flv, flv->lasttimestamp, cur_offset);
if (ret < 0)
goto fail;
}
break;
case AVMEDIA_TYPE_AUDIO:
flv->audiosize += (avio_tell(pb) - cur_offset);
break;
default:
av_log(s, AV_LOG_WARNING, "par->codec_type is type = [%d]\n", par->codec_type);
break;
}
}
fail:
av_free(data);
return ret;
}
static int flv_check_bitstream(AVFormatContext *s, AVStream *st,
const AVPacket *pkt)
{
if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
if (pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0)
return ff_stream_add_bitstream_filter(st, "aac_adtstoasc", NULL);
}
if (!st->codecpar->extradata_size &&
(st->codecpar->codec_id == AV_CODEC_ID_H264 ||
st->codecpar->codec_id == AV_CODEC_ID_HEVC ||
st->codecpar->codec_id == AV_CODEC_ID_AV1 ||
st->codecpar->codec_id == AV_CODEC_ID_MPEG4))
return ff_stream_add_bitstream_filter(st, "extract_extradata", NULL);
return 1;
}
static void flv_deinit(AVFormatContext *s)
{
FLVContext *flv = s->priv_data;
FLVFileposition *filepos = flv->head_filepositions;
while (filepos) {
FLVFileposition *next = filepos->next;
av_free(filepos);
filepos = next;
}
flv->filepositions = flv->head_filepositions = NULL;
flv->filepositions_count = 0;
}
static const AVOption options[] = {
{ "flvflags", "FLV muxer flags", offsetof(FLVContext, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
{ "aac_seq_header_detect", "Put AAC sequence header based on stream data", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_AAC_SEQ_HEADER_DETECT}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
{ "no_sequence_end", "disable sequence end for FLV", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_NO_SEQUENCE_END}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
{ "no_metadata", "disable metadata for FLV", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_NO_METADATA}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
{ "no_duration_filesize", "disable duration and filesize zero value metadata for FLV", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_NO_DURATION_FILESIZE}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
{ "add_keyframe_index", "Add keyframe index metadata", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_ADD_KEYFRAME_INDEX}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" },
{ NULL },
};
static const AVClass flv_muxer_class = {
.class_name = "flv muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFOutputFormat ff_flv_muxer = {
.p.name = "flv",
.p.long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
.p.mime_type = "video/x-flv",
.p.extensions = "flv",
.priv_data_size = sizeof(FLVContext),
.p.audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,
.p.video_codec = AV_CODEC_ID_FLV1,
.init = flv_init,
.write_header = flv_write_header,
.write_packet = flv_write_packet,
.write_trailer = flv_write_trailer,
.deinit = flv_deinit,
.check_bitstream= flv_check_bitstream,
.p.codec_tag = (const AVCodecTag* const []) {
flv_video_codec_ids, flv_audio_codec_ids, 0
},
.p.flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
AVFMT_TS_NONSTRICT,
.p.priv_class = &flv_muxer_class,
};