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ffmpeg.cpp
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ffmpeg.cpp
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#include "ffmpeg.h"
#define STREAM_FRAME_RATE 60
#define STREAM_PIXEL_FORMAT AV_PIX_FMT_YUV420P
#define IN_SOUND_FORMAT AV_SAMPLE_FMT_S16
struct supportedCodecs {
AVCodecID codecId;
char const *longName;
char const *exts;
};
const supportedCodecs audioSupported[] = {
{ AV_CODEC_ID_MP3, "MP3 (MPEG audio layer 3)", "mp3" },
{ AV_CODEC_ID_AAC, "ADTS AAC (Advanced Audio Coding)", "aac,adts" }
};
const supportedCodecs videoSupported[] = {
{ AV_CODEC_ID_MPEG4, "AVI (Audio Video Interleaved)", "avi" },
{ AV_CODEC_ID_MPEG4, "raw MPEG-4 video", "m4v" },
{ AV_CODEC_ID_FLV1, "FLV (Flash Video)", "flv" }
};
std::vector<char *> recording::getSupVidNames()
{
std::vector<char *> result;
size_t size = sizeof(videoSupported) / sizeof(videoSupported[0]);
for (size_t i = 0; i < size; ++i)
result.push_back((char *)videoSupported[i].longName);
return result;
}
std::vector<char *> recording::getSupVidExts()
{
std::vector<char *> result;
size_t size = sizeof(videoSupported) / sizeof(videoSupported[0]);
for (size_t i = 0; i < size; ++i)
result.push_back((char *)videoSupported[i].exts);
return result;
}
std::vector<char *> recording::getSupAudNames()
{
std::vector<char *> result;
size_t size = sizeof(audioSupported) / sizeof(audioSupported[0]);
for (size_t i = 0; i < size; ++i)
result.push_back((char *)audioSupported[i].longName);
return result;
}
std::vector<char *> recording::getSupAudExts()
{
std::vector<char *> result;
size_t size = sizeof(audioSupported) / sizeof(audioSupported[0]);
for (size_t i = 0; i < size; ++i)
result.push_back((char *)audioSupported[i].exts);
return result;
}
// avoid 'error: taking address of temporary array'
// for debug function when compiling
#ifdef av_err2str
#undef av_err2str
#define av_err2str(errnum) av_make_error_string((char*)__builtin_alloca(AV_ERROR_MAX_STRING_SIZE), AV_ERROR_MAX_STRING_SIZE, errnum)
#endif
#ifdef av_ts2str
#undef av_ts2str
#define av_ts2str(ts) av_ts_make_string((char*)__builtin_alloca(AV_TS_MAX_STRING_SIZE), ts)
#endif
#ifdef av_ts2timestr
#undef av_ts2timestr
#define av_ts2timestr(ts,tb) av_ts_make_time_string((char*)__builtin_alloca(AV_TS_MAX_STRING_SIZE), ts, tb)
#endif
// debug function
//static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt)
//{
// AVRational *time_base = &fmt_ctx->streams[pkt->stream_index]->time_base;
// fprintf(stderr, "pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d\n",
// av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, time_base),
// av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, time_base),
// av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, time_base),
// pkt->stream_index);
//}
recording::MediaRecorder::~MediaRecorder()
{
Stop();
}
recording::MediaRet recording::MediaRecorder::setup_audio_stream()
{
// audio stream
ast = avformat_new_stream(oc, NULL);
if (!ast) return MRET_ERR_BUFSIZE;
ast->id = oc->nb_streams - 1;
// audio codec
acodec = avcodec_find_encoder(fmt->audio_codec);
if (!acodec) return MRET_ERR_NOCODEC;
// audio codec context
aenc = avcodec_alloc_context3(acodec);
if (!aenc) return MRET_ERR_BUFSIZE;
aenc->sample_fmt = acodec->sample_fmts ? acodec->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;
aenc->bit_rate = 128000; // mp3
aenc->sample_rate = sampleRate;
// this might be useful to check if the codec suports the
// sample rate, but it is not strictly needed for now
bool isSupported = false;
if (acodec->supported_samplerates)
{
for (int i = 0; acodec->supported_samplerates[i]; ++i)
{
if (acodec->supported_samplerates[i] == sampleRate)
{
isSupported = true;
break;
}
}
}
if (!isSupported) return MRET_ERR_NOCODEC;
aenc->channels = av_get_channel_layout_nb_channels(aenc->channel_layout);
aenc->channel_layout = AV_CH_LAYOUT_STEREO;
if (acodec->channel_layouts)
{
aenc->channel_layout = acodec->channel_layouts[0];
for (int i = 0; acodec->channel_layouts[i]; ++i)
{
if (acodec->channel_layouts[i] == AV_CH_LAYOUT_STEREO)
aenc->channel_layout = AV_CH_LAYOUT_STEREO;
}
}
aenc->channels = av_get_channel_layout_nb_channels(aenc->channel_layout);
aenc->time_base = (AVRational){ 1, aenc->sample_rate };
ast->time_base = (AVRational){ 1, STREAM_FRAME_RATE };
// open and use codec on stream
int nb_samples;
if (avcodec_open2(aenc, acodec, NULL) < 0)
return MRET_ERR_NOCODEC;
if (avcodec_parameters_from_context(ast->codecpar, aenc) < 0)
return MRET_ERR_BUFSIZE;
// number of samples per frame
if (aenc->codec->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE)
nb_samples = 10000;
else
nb_samples = aenc->frame_size;
// audio frame for input
audioframeTmp = av_frame_alloc();
if (!audioframeTmp) return MRET_ERR_BUFSIZE;
audioframeTmp->format = IN_SOUND_FORMAT;
audioframeTmp->channel_layout = aenc->channel_layout;
audioframeTmp->sample_rate = aenc->sample_rate;
audioframeTmp->nb_samples = nb_samples;
if (nb_samples)
{
if (av_frame_get_buffer(audioframeTmp, 0) < 0)
return MRET_ERR_BUFSIZE;
}
// audio frame for output
audioframe = av_frame_alloc();
if (!audioframe) return MRET_ERR_BUFSIZE;
audioframe->format = aenc->sample_fmt;
audioframe->channel_layout = aenc->channel_layout;
audioframe->sample_rate = aenc->sample_rate;
audioframe->nb_samples = nb_samples;
if (nb_samples)
{
if (av_frame_get_buffer(audioframe, 0) < 0)
return MRET_ERR_BUFSIZE;
}
// initialize the converter
swr = swr_alloc();
if (!swr)
{
return MRET_ERR_BUFSIZE;
}
av_opt_set_int (swr, "in_channel_count", aenc->channels, 0);
av_opt_set_int (swr, "in_sample_rate", aenc->sample_rate, 0);
av_opt_set_sample_fmt(swr, "in_sample_fmt", IN_SOUND_FORMAT, 0);
av_opt_set_int (swr, "out_channel_count", aenc->channels, 0);
av_opt_set_int (swr, "out_sample_rate", aenc->sample_rate, 0);
av_opt_set_sample_fmt(swr, "out_sample_fmt", aenc->sample_fmt, 0);
if (swr_init(swr) < 0)
{
fprintf(stderr, "Failed to initialize the resampling context\n");
return MRET_ERR_BUFSIZE;
}
// auxiliary buffer for setting up frames for encode
audioBufferSize = nb_samples * aenc->channels * sizeof(uint16_t);
audioBuffer = (uint16_t *) calloc(nb_samples * aenc->channels, sizeof(uint16_t));
if (!audioBuffer) return MRET_ERR_BUFSIZE;
samplesInAudioBuffer = 0;
posInAudioBuffer = 0;
return MRET_OK;
}
recording::MediaRet recording::MediaRecorder::setup_video_stream_info(int width, int height, int depth)
{
switch (depth)
{
case 16:
// FIXME: test & make endian-neutral
pixfmt = AV_PIX_FMT_RGB565LE;
break;
case 24:
pixfmt = AV_PIX_FMT_RGB24;
break;
case 32:
pixfmt = AV_PIX_FMT_RGBA;
break;
default: // should never be anything else
pixfmt = AV_PIX_FMT_RGBA;
break;
}
// initialize the converter
sws = sws_getContext(width, height, pixfmt, // from
width, height, STREAM_PIXEL_FORMAT, // to
SWS_BICUBIC, NULL, NULL, NULL); // params
if (!sws) return MRET_ERR_BUFSIZE;
// getting info about frame
pixsize = depth >> 3;
linesize = pixsize * width;
switch (pixsize)
{
case 2:
// 16-bit: 2 @ right, 1 @ top
tbord = 1; rbord = 2;
break;
case 3:
// 24-bit: no border
tbord = rbord = 0;
break;
case 4:
// 32-bit: 1 @ right, 1 @ top
tbord = rbord = 1;
break;
default:
break;
}
return MRET_OK;
}
recording::MediaRet recording::MediaRecorder::setup_video_stream(int width, int height)
{
// video stream
st = avformat_new_stream(oc, NULL);
if (!st) return MRET_ERR_NOMEM;
st->id = oc->nb_streams - 1;
st->time_base = (AVRational){ 1, STREAM_FRAME_RATE };
// video codec
vcodec = avcodec_find_encoder(fmt->video_codec);
if (!vcodec) return MRET_ERR_FMTGUESS;
// codec context
enc = avcodec_alloc_context3(vcodec);
enc->codec_id = fmt->video_codec;
enc->bit_rate = 400000; // arbitrary
enc->width = width;
enc->height = height;
enc->time_base = st->time_base;
enc->gop_size = 12;
enc->pix_fmt = STREAM_PIXEL_FORMAT;
if (oc->oformat->flags & AVFMT_GLOBALHEADER)
enc->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
if (enc->codec_id == AV_CODEC_ID_MPEG2VIDEO)
enc->max_b_frames = 2;
if (enc->codec_id == AV_CODEC_ID_MPEG1VIDEO)
enc->mb_decision = 2;
// open and use codec on stream
if (avcodec_open2(enc, vcodec, NULL) < 0) return MRET_ERR_NOCODEC;
if (avcodec_parameters_from_context(st->codecpar, enc) < 0) return MRET_ERR_BUFSIZE;
// frame for input
frameIn = av_frame_alloc();
if (!frameIn) return MRET_ERR_NOMEM;
frameIn->format = pixfmt;
frameIn->width = width;
frameIn->height = height;
if (av_frame_get_buffer(frameIn, 32) < 0) return MRET_ERR_NOMEM;
// frame for output
frameOut = av_frame_alloc();
if (!frameOut) return MRET_ERR_NOMEM;
frameOut->format = STREAM_PIXEL_FORMAT;
frameOut->width = width;
frameOut->height = height;
if (av_frame_get_buffer(frameOut, 32) < 0) return MRET_ERR_NOMEM;
return MRET_OK;
}
recording::MediaRet recording::MediaRecorder::finish_setup(const char *fname)
{
av_dump_format(oc, 0, fname, 1);
// open the output file
if (!(fmt->flags & AVFMT_NOFILE))
{
if (avio_open(&oc->pb, fname, AVIO_FLAG_WRITE) < 0)
return MRET_ERR_FERR;
}
// write the stream header
if (avformat_write_header(oc, NULL) < 0) return MRET_ERR_FERR;
return MRET_OK;
}
recording::MediaRecorder::MediaRecorder() : isRecording(false),
sampleRate(44100), oc(NULL), fmt(NULL), audioOnlyRecording(false)
{
// pic info
pixfmt = AV_PIX_FMT_NONE;
pixsize = linesize = -1;
tbord = rbord = 0;
sws = NULL;
// stream info
st = NULL;
vcodec = NULL;
enc = NULL;
npts = 0;
frameIn = frameOut = NULL;
// audio setup
swr = NULL;
acodec = NULL;
ast = NULL;
aenc = NULL;
samplesCount = 0;
audioframe = NULL;
audioframeTmp = NULL;
audioBuffer = NULL;
posInAudioBuffer = 0;
samplesInAudioBuffer = 0;
audioBufferSize = 0;
}
// video : return error code to user
recording::MediaRet recording::MediaRecorder::Record(const char *fname, int width, int height, int depth)
{
MediaRet ret;
if (isRecording) return MRET_ERR_RECORDING;
isRecording = true;
// initial setup
ret = setup_common(fname);
if (ret != MRET_OK)
{
Stop();
return ret;
}
// video stream
ret = setup_video_stream_info(width, height, depth);
if (ret != MRET_OK)
{
Stop();
return ret;
}
ret = setup_video_stream(width, height);
if (ret != MRET_OK)
{
Stop();
return ret;
}
// audio stream
ret = setup_audio_stream();
if (ret != MRET_OK)
{
Stop();
return ret;
}
// last details
ret = finish_setup(fname);
if (ret != MRET_OK)
{
Stop();
return ret;
}
return MRET_OK;
}
recording::MediaRet recording::MediaRecorder::AddFrame(const uint8_t *vid)
{
if (!isRecording) return MRET_OK;
// fill and encode frame variables
int got_packet = 0, ret = 0;
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
// fill frame with current pic
ret = av_image_fill_arrays(frameIn->data, frameIn->linesize,
(uint8_t *)vid + tbord * (linesize + pixsize * rbord),
pixfmt, enc->width + rbord, enc->height, 1);
if (ret < 0) return MRET_ERR_RECORDING;
// convert from input format to output
sws_scale(sws, (const uint8_t * const *) frameIn->data,
frameIn->linesize, 0, enc->height, frameOut->data,
frameOut->linesize);
// set valid pts for frame
frameOut->pts = npts++;
// finally, encode frame
got_packet = avcodec_receive_packet(enc, &pkt);
ret = avcodec_send_frame(enc, frameOut);
if (ret < 0) return MRET_ERR_RECORDING;
if (!got_packet)
{
// rescale output packet timestamp values from codec
// to stream timebase
av_packet_rescale_ts(&pkt, enc->time_base, st->time_base);
pkt.stream_index = st->index;
//log_packet(oc, &pkt);
ret = av_interleaved_write_frame(oc, &pkt);
if (ret < 0) return MRET_ERR_RECORDING;
}
return MRET_OK;
}
void recording::MediaRecorder::Stop()
{
if (oc)
{
// write the trailer; must be called before av_codec_close()
if (!audioOnlyRecording)
av_write_trailer(oc);
}
isRecording = false;
if (sws)
{
sws_freeContext(sws);
sws = NULL;
}
if (st)
{
st = NULL;
}
if (enc)
{
avcodec_free_context(&enc);
avcodec_close(enc);
enc = NULL;
}
if (vcodec)
{
vcodec = NULL;
}
if (frameIn)
{
av_frame_free(&frameIn);
frameIn = NULL;
}
if (frameOut)
{
av_frame_free(&frameOut);
frameOut = NULL;
}
npts = 0;
if (oc)
{
// close the output file
if (!(fmt->flags & AVFMT_NOFILE))
{
avio_closep(&oc->pb);
}
fmt = NULL;
avformat_free_context(oc);
oc = NULL;
}
// audio
audioOnlyRecording = false;
if (swr)
{
swr_free(&swr);
swr = NULL;
}
if (acodec)
{
acodec = NULL;
}
if (ast)
{
ast = NULL;
}
if (aenc)
{
avcodec_free_context(&aenc);
avcodec_close(aenc);
aenc = NULL;
}
samplesCount = 0;
if (audioframe)
{
av_frame_free(&audioframe);
audioframe = NULL;
}
if (audioframeTmp)
{
av_frame_free(&audioframeTmp);
audioframeTmp = NULL;
}
if (audioBuffer)
{
free(audioBuffer);
audioBuffer = NULL;
}
samplesInAudioBuffer = 0;
posInAudioBuffer = 0;
}
recording::MediaRet recording::MediaRecorder::setup_common(const char *fname)
{
avformat_alloc_output_context2(&oc, NULL, NULL, fname);
if (!oc) return MRET_ERR_BUFSIZE;
fmt = oc->oformat;
return MRET_OK;
}
// audio : return error code to user
recording::MediaRet recording::MediaRecorder::Record(const char *fname)
{
MediaRet ret;
if (isRecording) return MRET_ERR_RECORDING;
isRecording = true;
audioOnlyRecording = true;
// initial setup
ret = setup_common(fname);
if (ret != MRET_OK)
{
Stop();
return ret;
}
// audio stream
ret = setup_audio_stream();
if (ret != MRET_OK)
{
Stop();
return ret;
}
// last details
ret = finish_setup(fname);
if (ret != MRET_OK)
{
Stop();
return ret;
}
return MRET_OK;
}
#define MIN(a,b) (((a)<(b))?(a):(b))
recording::MediaRet recording::MediaRecorder::AddFrame(const uint16_t *aud, int length)
{
if (!isRecording) return MRET_OK;
AVCodecContext *c = aenc;
int samples_size = av_samples_get_buffer_size(NULL, c->channels, audioframeTmp->nb_samples, IN_SOUND_FORMAT, 1);
int realLength = length / sizeof *aud;
bool isMissing = false;
int cp = -1;
if (samplesInAudioBuffer < c->frame_size)
{
int missingSamples = (c->frame_size - samplesInAudioBuffer);
// 2 * missingSamples =: for 2 channels
// realLength =: entire samples (1470 ~ 735 samples per channel)
int maxCopy = MIN(2 * missingSamples, realLength);
memcpy(audioBuffer + posInAudioBuffer, aud, maxCopy * 2);
posInAudioBuffer += maxCopy;
samplesInAudioBuffer += (maxCopy / 2);
aud += maxCopy;
if (maxCopy < realLength)
{
isMissing = true;
cp = realLength - maxCopy;
}
}
if (samplesInAudioBuffer != c->frame_size) // not enough samples
{
return MRET_OK;
}
int got_packet;
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
if (avcodec_fill_audio_frame(audioframeTmp, c->channels, IN_SOUND_FORMAT, (const uint8_t *)audioBuffer, samples_size, 1) < 0)
{
return MRET_ERR_RECORDING;
}
int dst_nb_samples = av_rescale_rnd(swr_get_delay(swr, c->sample_rate) + audioframeTmp->nb_samples, c->sample_rate, c->sample_rate, AV_ROUND_UP);
av_assert0(dst_nb_samples == audioframeTmp->nb_samples);
audioframeTmp->data[3] = audioframeTmp->data[2] = audioframeTmp->data[1] = audioframeTmp->data[0];
if (swr_convert(swr, audioframe->data, audioframe->nb_samples, (const uint8_t **)audioframeTmp->data, audioframeTmp->nb_samples) < 0)
{
return MRET_ERR_RECORDING;
}
audioframe->data[3] = audioframe->data[2] = audioframe->data[1] = audioframe->data[0];
audioframe->pts = av_rescale_q(samplesCount, (AVRational){1, c->sample_rate}, c->time_base);
samplesCount += dst_nb_samples;
got_packet = avcodec_receive_packet(c, &pkt);
if (avcodec_send_frame(c, audioframe) < 0)
{
return MRET_ERR_RECORDING;
}
if (!got_packet)
{
av_packet_rescale_ts(&pkt, (AVRational){ 1, c->sample_rate }, ast->time_base);
pkt.stream_index = ast->index;
//log_packet(oc, &pkt);
if (av_interleaved_write_frame(oc, &pkt) < 0)
{
return MRET_ERR_RECORDING;
}
}
// if we are missing part of the sample, adjust here
// for next iteration
posInAudioBuffer = 0;
samplesInAudioBuffer = 0;
memset(audioBuffer, 0, audioBufferSize);
if (isMissing)
{
memcpy(audioBuffer, aud, cp * 2);
posInAudioBuffer = cp;
samplesInAudioBuffer = (cp / 2);
}
return MRET_OK;
}