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embedded-framework/utils/MediaBase/src/FfmpegMuxStream.cpp
Fancy code 4706bfa7dd Add sqlite3 function.
2024-06-25 22:44:32 +08:00

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/*
* Copyright (c) 2023 Fancy Code.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "FfmpegMuxStream.h"
#include "ILog.h"
#include "MediaBase.h"
#include "StatusCode.h"
#include <cstddef>
#include <cstdlib>
#include <stdio.h>
#include <string.h>
#include <string>
#ifdef __cplusplus
extern "C" {
#endif
#include <libavcodec/avcodec.h>
#include <libavcodec/codec.h>
#include <libavcodec/codec_id.h>
#include <libavcodec/packet.h>
#include <libavformat/avformat.h>
#include <libavformat/avio.h>
#include <libavutil/avutil.h>
#include <libavutil/channel_layout.h>
#include <libavutil/dict.h>
#include <libavutil/error.h>
#include <libavutil/frame.h>
#include <libavutil/opt.h>
#include <libavutil/pixfmt.h>
#include <libavutil/samplefmt.h>
#include <libavutil/timestamp.h>
#include <libswresample/swresample.h>
#include <libswscale/swscale.h>
#ifdef __cplusplus
}
#endif
#include <errno.h>
#include <math.h>
#define STREAM_DURATION 10.0
#define STREAM_FRAME_RATE 25 /* 25 images/s */
#define STREAM_PIX_FMT AV_PIX_FMT_YUV420P /* default pix_fmt */
FfmpegMuxStream::FfmpegMuxStream()
: mCodecVideo(nullptr), mCodecVideoContext(nullptr), mFrameVideo(nullptr), mCodecAudio(nullptr),
mCodecAudioContext(nullptr), mFrameAudio(nullptr), mOc(nullptr)
{
memset(&mVideoSt, 0, sizeof(mVideoSt));
memset(&mAudioSt, 0, sizeof(mAudioSt));
}
StatusCode FfmpegMuxStream::OpenOutputFile(const std::string &fileName)
{
if (!InitCodecVideo(AV_CODEC_ID_H264, &mCodecVideo, &mCodecVideoContext, &mFrameVideo)) {
LogError("InitCodec failed\n");
return CreateStatusCode(STATUS_CODE_NOT_OK);
}
if (!InitCodecAudio(AV_CODEC_ID_PCM_ALAW, &mCodecAudio, &mCodecAudioContext, &mFrameAudio)) {
LogError("InitCodec failed\n");
return CreateStatusCode(STATUS_CODE_NOT_OK);
}
int ret;
AVFormatContext *oc = nullptr;
int have_video = 0, have_audio = 0;
int encode_video = 0, encode_audio = 0;
const AVCodec *audio_codec, *video_codec;
AVDictionary *opt = nullptr;
avformat_alloc_output_context2(&oc, nullptr, "mp4", fileName.c_str());
if (!oc) {
LogError("Could not deduce output format from file extension: using MPEG.\n");
return CreateStatusCode(STATUS_CODE_NOT_OK);
}
mOc = oc;
const AVOutputFormat *fmt = oc->oformat;
/* Add the audio and video streams using the default format codecs
* and initialize the codecs. */
if (fmt->video_codec != AV_CODEC_ID_NONE) {
LogInfo("Add video stream\n");
add_stream(&mVideoSt, oc, &video_codec, fmt->video_codec);
have_video = 1;
encode_video = 1;
}
if (fmt->audio_codec != AV_CODEC_ID_NONE) {
LogInfo("Add audio stream\n");
add_stream(&mAudioSt, oc, &audio_codec, fmt->audio_codec);
have_audio = 1;
encode_audio = 1;
} /* Now that all the parameters are set, we can open the audio and
* video codecs and allocate the necessary encode buffers. */
if (have_video) {
open_video(oc, video_codec, &mVideoSt, opt);
}
if (have_audio) {
open_audio(oc, audio_codec, &mAudioSt, opt);
}
av_dump_format(oc, 0, fileName.c_str(), 1);
if (!(fmt->flags & AVFMT_NOFILE)) {
ret = avio_open(&oc->pb, fileName.c_str(), AVIO_FLAG_WRITE);
if (ret < 0) {
char error_str[AV_ERROR_MAX_STRING_SIZE] = {0};
LogInfo("Could not open '%s': %s\n",
fileName.c_str(),
av_make_error_string(error_str, AV_ERROR_MAX_STRING_SIZE, ret));
return CreateStatusCode(STATUS_CODE_NOT_OK);
}
}
/* Write the stream header, if any. */
ret = avformat_write_header(oc, &opt);
if (ret < 0) {
char error_str[AV_ERROR_MAX_STRING_SIZE] = {0};
LogInfo("Error occurred when opening output file: %s\n",
av_make_error_string(error_str, AV_ERROR_MAX_STRING_SIZE, ret));
return CreateStatusCode(STATUS_CODE_NOT_OK);
}
return CreateStatusCode(STATUS_CODE_OK);
}
StatusCode FfmpegMuxStream::CloseOutputFile(void)
{
av_write_trailer(mOc);
if (mFrameVideo) {
av_frame_free(&mFrameVideo);
mFrameVideo = nullptr;
}
if (mFrameAudio) {
av_frame_free(&mFrameAudio);
mFrameAudio = nullptr;
}
if (mCodecVideoContext) {
avcodec_free_context(&mCodecVideoContext);
mCodecVideoContext = nullptr;
}
if (mCodecAudioContext) {
avcodec_free_context(&mCodecAudioContext);
mCodecAudioContext = nullptr;
}
close_stream(mOc, &mVideoSt);
close_stream(mOc, &mAudioSt);
memset(&mVideoSt, 0, sizeof(mVideoSt));
memset(&mAudioSt, 0, sizeof(mAudioSt));
if (!(mOc->oformat->flags & AVFMT_NOFILE)) {
/* Close the output file. */
avio_closep(&mOc->pb);
}
avformat_free_context(mOc);
return CreateStatusCode(STATUS_CODE_OK);
}
void FfmpegMuxStream::GetStreamData(const void *data, const size_t &size, const StreamInfo &streamInfo)
{
if (streamInfo.mType == STREAM_TYPE_VIDEO_H264) {
GetVideoStream(data, size, streamInfo);
}
if (streamInfo.mType == STREAM_TYPE_AUDIO_G711A) {
GetAudioStream(data, size, streamInfo);
}
}
void FfmpegMuxStream::GetVideoStream(const void *data, const size_t &size, const StreamInfo &streamInfo)
{
AVPacket *packet = nullptr;
packet = av_packet_alloc();
packet->data = (unsigned char *)data;
packet->size = size;
int ret = avcodec_send_packet(mCodecVideoContext, packet);
if (ret < 0) {
LogInfo("Error sending a packet for decoding\n");
av_packet_unref(packet);
av_packet_free(&packet);
return;
}
while (ret >= 0) {
ret = avcodec_receive_frame(mCodecVideoContext, mFrameVideo);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
break;
}
if (ret < 0) {
LogInfo("Error during decoding\n");
break;
}
write_frame(mOc, mVideoSt.enc, mVideoSt.st, mFrameVideo, mVideoSt.tmp_pkt);
break;
}
av_packet_unref(packet);
av_packet_free(&packet);
}
void FfmpegMuxStream::GetAudioStream(const void *data, const size_t &size, const StreamInfo &streamInfo)
{
AVPacket *packet = nullptr;
packet = av_packet_alloc();
packet->data = (unsigned char *)data;
packet->size = size;
int ret = avcodec_send_packet(mCodecAudioContext, packet);
if (ret < 0) {
LogInfo("Error sending a packet for decoding\n");
av_packet_unref(packet);
av_packet_free(&packet);
return;
}
while (ret >= 0) {
ret = avcodec_receive_frame(mCodecAudioContext, mFrameAudio);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
break;
}
if (ret < 0) {
LogInfo("Error during decoding\n");
break;
}
mFrameAudio->pts = mAudioSt.next_pts;
mAudioSt.next_pts += mFrameAudio->nb_samples;
ConvertAudioFrame(mFrameVideo, mAudioSt.enc, &mAudioSt);
write_frame(mOc, mAudioSt.enc, mAudioSt.st, mAudioSt.frame, mAudioSt.tmp_pkt);
break;
}
av_packet_unref(packet);
av_packet_free(&packet);
}
bool FfmpegMuxStream::add_stream(OutputStream *ost, AVFormatContext *oc, const AVCodec **codec, enum AVCodecID codec_id)
{
AVCodecContext *c;
int i;
/* find the encoder */
*codec = avcodec_find_encoder(codec_id);
if (!(*codec)) {
LogError("Could not find encoder for '%s'\n", avcodec_get_name(codec_id));
return false;
}
ost->tmp_pkt = av_packet_alloc();
if (!ost->tmp_pkt) {
LogError("Could not allocate AVPacket\n");
return false;
}
ost->st = avformat_new_stream(oc, nullptr);
if (!ost->st) {
LogError("Could not allocate stream\n");
return false;
}
ost->st->id = oc->nb_streams - 1;
c = avcodec_alloc_context3(*codec);
if (!c) {
LogError("Could not alloc an encoding context\n");
return false;
}
ost->enc = c;
const AVChannelLayout src = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
switch ((*codec)->type) {
case AVMEDIA_TYPE_AUDIO:
c->sample_fmt = (*codec)->sample_fmts ? (*codec)->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;
c->bit_rate = 64000;
c->sample_rate = 8000;
if ((*codec)->supported_samplerates) {
c->sample_rate = (*codec)->supported_samplerates[0];
for (i = 0; (*codec)->supported_samplerates[i]; i++) {
if ((*codec)->supported_samplerates[i] == 44100)
c->sample_rate = 44100;
}
}
av_channel_layout_copy(&c->ch_layout, &src);
ost->st->time_base = (AVRational){1, c->sample_rate};
break;
case AVMEDIA_TYPE_VIDEO:
c->codec_id = codec_id;
c->bit_rate = 400000;
/* Resolution must be a multiple of two. */
c->width = 1920;
c->height = 2160;
/* timebase: This is the fundamental unit of time (in seconds) in terms
* of which frame timestamps are represented. For fixed-fps content,
* timebase should be 1/framerate and timestamp increments should be
* identical to 1. */
ost->st->time_base = (AVRational){1, STREAM_FRAME_RATE};
c->time_base = ost->st->time_base;
c->gop_size = 12; /* emit one intra frame every twelve frames at most */
c->pix_fmt = STREAM_PIX_FMT;
if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
/* just for testing, we also add B-frames */
c->max_b_frames = 2;
}
if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
/* Needed to avoid using macroblocks in which some coeffs overflow.
* This does not happen with normal video, it just happens here as
* the motion of the chroma plane does not match the luma plane. */
c->mb_decision = 2;
}
break;
default:
break;
}
/* Some formats want stream headers to be separate. */
if (oc->oformat->flags & AVFMT_GLOBALHEADER) {
c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
}
return true;
}
void FfmpegMuxStream::close_stream(AVFormatContext *oc, OutputStream *ost)
{
avcodec_free_context(&ost->enc);
av_frame_free(&ost->frame);
av_frame_free(&ost->tmp_frame);
av_packet_free(&ost->tmp_pkt);
sws_freeContext(ost->sws_ctx);
swr_free(&ost->swr_ctx);
}
bool FfmpegMuxStream::open_video(AVFormatContext *oc, const AVCodec *codec, OutputStream *ost, AVDictionary *opt_arg)
{
int ret;
AVCodecContext *c = ost->enc;
AVDictionary *opt = nullptr;
av_dict_copy(&opt, opt_arg, 0);
/* open the codec */
ret = avcodec_open2(c, codec, &opt);
av_dict_free(&opt);
if (ret < 0) {
char error_str[AV_ERROR_MAX_STRING_SIZE] = {0};
LogInfo("Could not open video codec: %s\n", av_make_error_string(error_str, AV_ERROR_MAX_STRING_SIZE, ret));
return false;
}
/* allocate and init a re-usable frame */
ost->frame = alloc_frame(c->pix_fmt, c->width, c->height);
if (!ost->frame) {
LogInfo("Could not allocate video frame\n");
return false;
}
/* If the output format is not YUV420P, then a temporary YUV420P
* picture is needed too. It is then converted to the required
* output format. */
ost->tmp_frame = nullptr;
if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
ost->tmp_frame = alloc_frame(AV_PIX_FMT_YUV420P, c->width, c->height);
if (!ost->tmp_frame) {
LogInfo("Could not allocate temporary video frame\n");
return false;
}
}
/* copy the stream parameters to the muxer */
ret = avcodec_parameters_from_context(ost->st->codecpar, c);
if (ret < 0) {
LogInfo("Could not copy the stream parameters\n");
return false;
}
return true;
}
bool FfmpegMuxStream::open_audio(AVFormatContext *oc, const AVCodec *codec, OutputStream *ost, AVDictionary *opt_arg)
{
AVCodecContext *c = nullptr;
int nb_samples = 0;
int ret = 0;
AVDictionary *opt = nullptr;
c = ost->enc;
/* open it */
av_dict_copy(&opt, opt_arg, 0);
ret = avcodec_open2(c, codec, &opt);
av_dict_free(&opt);
if (ret < 0) {
char error_str[AV_ERROR_MAX_STRING_SIZE] = {0};
LogInfo("Could not open audio codec: %s\n", av_make_error_string(error_str, AV_ERROR_MAX_STRING_SIZE, ret));
return false;
}
/* init signal generator */
ost->t = 0;
ost->tincr = 2 * M_PI * 110.0 / c->sample_rate;
/* increment frequency by 110 Hz per second */
ost->tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
if (c->codec->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE)
nb_samples = 10000;
else
nb_samples = c->frame_size;
ost->frame = alloc_audio_frame(c->sample_fmt, &c->ch_layout, c->sample_rate, nb_samples);
ost->tmp_frame = alloc_audio_frame(AV_SAMPLE_FMT_S16, &c->ch_layout, c->sample_rate, nb_samples);
/* copy the stream parameters to the muxer */
ret = avcodec_parameters_from_context(ost->st->codecpar, c);
if (ret < 0) {
LogInfo("Could not copy the stream parameters\n");
return false;
}
/* create resampler context */
ost->swr_ctx = swr_alloc();
if (!ost->swr_ctx) {
LogInfo("Could not allocate resampler context\n");
return false;
}
/* set options */
av_opt_set_chlayout(ost->swr_ctx, "in_chlayout", &c->ch_layout, 0);
av_opt_set_int(ost->swr_ctx, "in_sample_rate", c->sample_rate, 0);
av_opt_set_sample_fmt(ost->swr_ctx, "in_sample_fmt", AV_SAMPLE_FMT_S16, 0);
av_opt_set_chlayout(ost->swr_ctx, "out_chlayout", &c->ch_layout, 0);
av_opt_set_int(ost->swr_ctx, "out_sample_rate", c->sample_rate, 0);
av_opt_set_sample_fmt(ost->swr_ctx, "out_sample_fmt", c->sample_fmt, 0);
/* initialize the resampling context */
if ((ret = swr_init(ost->swr_ctx)) < 0) {
LogInfo("Failed to initialize the resampling context\n");
return false;
}
return true;
}
AVFrame *FfmpegMuxStream::alloc_audio_frame(enum AVSampleFormat sample_fmt, const AVChannelLayout *channel_layout,
int sample_rate, int nb_samples)
{
AVFrame *frame = av_frame_alloc();
if (!frame) {
LogInfo("Error allocating an audio frame\n");
return nullptr;
}
frame->format = sample_fmt;
av_channel_layout_copy(&frame->ch_layout, channel_layout);
frame->sample_rate = sample_rate;
frame->nb_samples = nb_samples;
if (nb_samples) {
if (av_frame_get_buffer(frame, 0) < 0) {
LogInfo("Error allocating an audio buffer\n");
return nullptr;
}
}
return frame;
}
AVFrame *FfmpegMuxStream::alloc_frame(enum AVPixelFormat pix_fmt, int width, int height)
{
AVFrame *frame;
int ret;
frame = av_frame_alloc();
if (!frame)
return nullptr;
frame->format = pix_fmt;
frame->width = width;
frame->height = height;
/* allocate the buffers for the frame data */
ret = av_frame_get_buffer(frame, 0);
if (ret < 0) {
LogInfo("Could not allocate frame data.\n");
return nullptr;
}
return frame;
}
bool FfmpegMuxStream::InitCodecVideo(enum AVCodecID codecId, AVCodec **codec, AVCodecContext **codec_ctx,
AVFrame **frame)
{
int ret = 0;
*codec = (AVCodec *)avcodec_find_decoder(codecId);
if (!(*codec)) {
LogError("Codec not found\n");
return false;
}
*codec_ctx = avcodec_alloc_context3((const AVCodec *)(*codec));
if (!(*codec_ctx)) {
LogError("Could not allocate codec context\n");
return false;
}
if ((ret = avcodec_open2(*codec_ctx, *codec, nullptr)) < 0) {
char error_str[AV_ERROR_MAX_STRING_SIZE] = {0};
LogError("Could not open codec:%s\n", av_make_error_string(error_str, AV_ERROR_MAX_STRING_SIZE, ret));
return false;
}
*frame = av_frame_alloc();
if (!frame) {
LogError("Could not allocate video frame\n");
return false;
}
return true;
}
bool FfmpegMuxStream::InitCodecAudio(enum AVCodecID codecId, AVCodec **codec, AVCodecContext **codec_ctx,
AVFrame **frame)
{
int ret = 0;
*codec = (AVCodec *)avcodec_find_decoder(codecId);
// *codec = (AVCodec *)avcodec_find_encoder_by_name("libfdk_aac");
if (!(*codec)) {
LogError("Codec not found\n");
return false;
}
*codec_ctx = avcodec_alloc_context3((const AVCodec *)(*codec));
if (!(*codec_ctx)) {
LogError("Could not allocate codec context\n");
return false;
}
/* put sample parameters */
(*codec_ctx)->bit_rate = 64000;
/* check that the encoder supports s16 pcm input */
(*codec_ctx)->sample_fmt = AV_SAMPLE_FMT_S16;
if (!check_sample_fmt((*codec), (*codec_ctx)->sample_fmt)) {
fprintf(stderr, "Encoder does not support sample format %s", av_get_sample_fmt_name((*codec_ctx)->sample_fmt));
return false;
}
/* select other audio parameters supported by the encoder */
(*codec_ctx)->sample_rate = select_sample_rate((*codec));
ret = select_channel_layout((*codec), &((*codec_ctx)->ch_layout));
if (ret < 0) {
LogError("Could not set channel layout\n");
return false;
}
if ((ret = avcodec_open2(*codec_ctx, *codec, nullptr)) < 0) {
char error_str[AV_ERROR_MAX_STRING_SIZE] = {0};
LogError("Could not open codec:%s\n", av_make_error_string(error_str, AV_ERROR_MAX_STRING_SIZE, ret));
return false;
}
*frame = av_frame_alloc();
if (!(*frame)) {
LogError("Could not allocate video frame\n");
return false;
}
(*frame)->nb_samples = (*codec_ctx)->frame_size;
(*frame)->format = (*codec_ctx)->sample_fmt;
ret = av_channel_layout_copy(&((*frame)->ch_layout), &((*codec_ctx)->ch_layout));
if (ret < 0) {
LogError("Could not copy channel layout\n");
return false;
}
return true;
}
int FfmpegMuxStream::write_frame(AVFormatContext *fmt_ctx, AVCodecContext *c, AVStream *st, AVFrame *frame,
AVPacket *pkt)
{
int ret = 0;
// send the frame to the encoder
ret = avcodec_send_frame(c, frame);
if (ret < 0) {
char error_str[AV_ERROR_MAX_STRING_SIZE] = {0};
LogInfo("Error sending a frame to the encoder: %s\n",
av_make_error_string(error_str, AV_ERROR_MAX_STRING_SIZE, ret));
return -1;
}
while (ret >= 0) {
ret = avcodec_receive_packet(c, pkt);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
break;
}
if (ret < 0) {
char error_str[AV_ERROR_MAX_STRING_SIZE] = {0};
LogInfo("Error encoding a frame: %s\n", av_make_error_string(error_str, AV_ERROR_MAX_STRING_SIZE, ret));
return -1;
}
/* rescale output packet timestamp values from codec to stream timebase */
av_packet_rescale_ts(pkt, c->time_base, st->time_base);
pkt->stream_index = st->index;
/* Write the compressed frame to the media file. */
log_packet(fmt_ctx, pkt);
ret = av_interleaved_write_frame(fmt_ctx, pkt);
/* pkt is now blank (av_interleaved_write_frame() takes ownership of
* its contents and resets pkt), so that no unreferencing is necessary.
* This would be different if one used av_write_frame(). */
if (ret < 0) {
char error_str[AV_ERROR_MAX_STRING_SIZE] = {0};
LogInfo("Error while writing output packet: %s\n",
av_make_error_string(error_str, AV_ERROR_MAX_STRING_SIZE, ret));
return -1;
}
}
return ret == AVERROR_EOF ? 1 : 0;
}
void FfmpegMuxStream::log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt)
{
char pts[AV_TS_MAX_STRING_SIZE] = {0};
char dts[AV_TS_MAX_STRING_SIZE] = {0};
char duration[AV_TS_MAX_STRING_SIZE] = {0};
char pts_time[AV_TS_MAX_STRING_SIZE] = {0};
char dts_time[AV_TS_MAX_STRING_SIZE] = {0};
char duration_time[AV_TS_MAX_STRING_SIZE];
AVRational *time_base = &fmt_ctx->streams[pkt->stream_index]->time_base;
av_ts_make_string(pts, pkt->pts);
LogInfo("pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d\n",
av_ts_make_string(pts, pkt->pts),
av_ts_make_time_string(pts_time, pkt->pts, time_base),
av_ts_make_string(dts, pkt->dts),
av_ts_make_time_string(dts_time, pkt->dts, time_base),
av_ts_make_string(duration, pkt->duration),
av_ts_make_time_string(duration_time, pkt->duration, time_base),
pkt->stream_index);
}
/* check that a given sample format is supported by the encoder */
int FfmpegMuxStream::check_sample_fmt(const AVCodec *codec, enum AVSampleFormat sample_fmt)
{
const enum AVSampleFormat *p = codec->sample_fmts;
while (*p != AV_SAMPLE_FMT_NONE) {
if (*p == sample_fmt)
return 1;
p++;
}
return 0;
}
/* just pick the highest supported samplerate */
int FfmpegMuxStream::select_sample_rate(const AVCodec *codec)
{
const int *p;
int best_samplerate = 0;
if (!codec->supported_samplerates)
return 44100;
p = codec->supported_samplerates;
while (*p) {
if (!best_samplerate || abs(44100 - *p) < abs(44100 - best_samplerate))
best_samplerate = *p;
p++;
}
return best_samplerate;
} /* select layout with the highest channel count */
int FfmpegMuxStream::select_channel_layout(const AVCodec *codec, AVChannelLayout *dst)
{
const AVChannelLayout *p, *best_ch_layout = nullptr;
int best_nb_channels = 0;
AVChannelLayout channelLayout = AV_CHANNEL_LAYOUT_STEREO;
if (!codec->ch_layouts)
return av_channel_layout_copy(dst, &channelLayout);
p = codec->ch_layouts;
while (p->nb_channels) {
int nb_channels = p->nb_channels;
if (nb_channels > best_nb_channels) {
best_ch_layout = p;
best_nb_channels = nb_channels;
}
p++;
}
return av_channel_layout_copy(dst, best_ch_layout);
}
bool FfmpegMuxStream::ConvertAudioFrame(AVFrame *frame, AVCodecContext *c, OutputStream *ost)
{
if (nullptr == frame) {
LogError("frame is null\n");
return false;
}
int ret = 0;
int dst_nb_samples = 0;
/* convert samples from native format to destination codec format, using the resampler */
/* compute destination number of samples */
dst_nb_samples = av_rescale_rnd(
swr_get_delay(ost->swr_ctx, c->sample_rate) + frame->nb_samples, c->sample_rate, c->sample_rate, AV_ROUND_UP);
av_assert0(dst_nb_samples == frame->nb_samples);
/* when we pass a frame to the encoder, it may keep a reference to it
* internally;
* make sure we do not overwrite it here
*/
ret = av_frame_make_writable(ost->frame);
if (ret < 0) {
LogError("av_frame_make_writable failed\n");
return false;
}
/* convert to destination format */
ret = swr_convert(ost->swr_ctx, ost->frame->data, dst_nb_samples, (const uint8_t **)frame->data, frame->nb_samples);
if (ret < 0) {
LogError("Error while converting\n");
return false;
}
frame = ost->frame;
frame->pts = av_rescale_q(ost->samples_count, (AVRational){1, c->sample_rate}, c->time_base);
ost->samples_count += dst_nb_samples;
return true;
}
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