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Code Issues Releases Activity

avformat/flvenc: Add aac_seq_header_detect and flvflags

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Maksym Veremeyenko 2015-11-18 23:44:08 +02:00 committed by Michael Niedermayer
parent d21b690e55
commit acb430e4d3
1 changed files with 45 additions and 0 deletions
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45
libavformat/flvenc.c
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@ -28,6 +28,9 @@
#include "flv.h"
#include "internal.h"
#include "metadata.h"
#include "libavutil/opt.h"
#include "libavcodec/put_bits.h"
#include "libavcodec/aacenctab.h"
static const AVCodecTag flv_video_codec_ids[] = {
@ -58,6 +61,7 @@ static const AVCodecTag flv_audio_codec_ids[] = {
};
typedef struct FLVContext {
AVClass *av_class;
int reserved;
int64_t duration_offset;
int64_t filesize_offset;
@ -68,6 +72,8 @@ typedef struct FLVContext {
AVCodecContext *video_enc;
double framerate;
AVCodecContext *data_enc;
int flags;
} FLVContext;
typedef struct FLVStreamContext {
@ -452,6 +458,31 @@ static int flv_write_header(AVFormatContext *s)
if (enc->codec_id == AV_CODEC_ID_AAC) {
avio_w8(pb, get_audio_flags(s, enc));
avio_w8(pb, 0); // AAC sequence header
if (!enc->extradata_size && flv->flags & 1) {
PutBitContext pbc;
int samplerate_index;
int channels = flv->audio_enc->channels - (flv->audio_enc->channels == 8 ? 1 : 0);
uint8_t data[2];
for (samplerate_index = 0; samplerate_index < 16; samplerate_index++)
if (flv->audio_enc->sample_rate == mpeg4audio_sample_rates[samplerate_index])
break;
init_put_bits(&pbc, data, sizeof(data));
put_bits(&pbc, 5, flv->audio_enc->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, enc->extradata, enc->extradata_size);
} else {
avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
@ -655,6 +686,19 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
return pb->error;
}
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 = 1}, 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,
};
AVOutputFormat ff_flv_muxer = {
.name = "flv",
.long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
@ -671,4 +715,5 @@ AVOutputFormat ff_flv_muxer = {
},
.flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
AVFMT_TS_NONSTRICT,
.priv_class = &flv_muxer_class,
};