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/*
* convert.c
*/
#include "convert.h"
#include <vdr/tools.h>
#ifndef AVCODEC_MAX_AUDIO_FRAME_SIZE
#define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
#endif
/* --- cConvert ------------------------------------------------------------- */
cConvert::cConvert(const cPostData &postdata)
{
encoder_buf.data = NULL;
encoder_buf.length = 0;
encoder_open = -1;
decoder_buf.data = NULL;
decoder_buf.length = 0;
decoder_open = -1;
init_decoder();
init_encoder(audio_codecs[postdata.get_codec()], postdata.get_bit_rate(),
postdata.get_sample_rate(), postdata.get_channels());
}
cConvert::~cConvert()
{
delete[] encoder_buf.data;
delete[] decoder_buf.data;
if (decoder_open > -1) {
avcodec_close(decoder_ctx);
av_free(decoder_ctx);
}
if (encoder_open > -1) {
avcodec_close(encoder_ctx);
av_free(encoder_ctx);
}
}
void cConvert::init_decoder(void)
{
decoder_codec = avcodec_find_decoder_by_name("mp2");
if (! decoder_codec) {
dsyslog("[audiorecorder]: codec mp2 is not supported (%s, "
"%s())", __FILE__, __func__);
return;
}
decoder_ctx = avcodec_alloc_context3(NULL);
decoder_open = avcodec_open2(decoder_ctx, decoder_codec, NULL);
if (decoder_open < 0) {
dsyslog("[audiorecorder]: could not open codec mp2 (%s, "
"%s())", __FILE__, __func__);
return;
}
decoder_buf.data = new uchar[AVCODEC_MAX_AUDIO_FRAME_SIZE];
dsyslog("[audiorecorder]: decoder initialized (%s, %s())", __FILE__,
__func__);
}
void cConvert::init_encoder(const char *codec, int bit_rate, int sample_rate,
int channels)
{
encoder_codec = avcodec_find_encoder_by_name(codec);
if (! encoder_codec) {
dsyslog("[audiorecorder]: codec %s is not supported (%s, "
"%s())", codec, __FILE__, __func__);
return;
}
encoder_ctx = avcodec_alloc_context3(NULL);
encoder_ctx->bit_rate = bit_rate;
encoder_ctx->sample_fmt = AV_SAMPLE_FMT_S16P;
encoder_ctx->sample_rate = sample_rate;
encoder_ctx->channel_layout = AV_CH_LAYOUT_STEREO;
encoder_ctx->channels = channels;
encoder_open = avcodec_open2(encoder_ctx, encoder_codec, NULL);
if (encoder_open < 0) {
dsyslog("[audiorecorder]: could not open codec %s (%s, %s())", codec, __FILE__, __func__);
return;
}
encoder_buf.length = encoder_ctx->frame_size;
encoder_buf.data = new uchar[encoder_buf.length];
dsyslog("[audiorecorder]: encoder for %s-codec (br: %d, sr: %d, %d ch) "
"initialized (%s, %s())", encoder_codec->name,
encoder_ctx->bit_rate, encoder_ctx->sample_rate,
encoder_ctx->channels, __FILE__, __func__);
}
void cConvert::decode_mpa_frame(mpeg_audio_frame *mpa_frame)
{
if (decoder_open < 0) {
decoder_buf.length = 0;
return;
}
//#ifndef AVCODEC_NEW
AVPacket avpkt;
av_init_packet(&avpkt);
avpkt.data = mpa_frame->data;
avpkt.size = mpa_frame->length;
decoder_buf.length = AVCODEC_MAX_AUDIO_FRAME_SIZE;
int len = avcodec_decode_audio3(decoder_ctx, (short *)decoder_buf.data,
&decoder_buf.length, &avpkt);
//#else
//#error "avcodec_decode_audio4 not implemented yet!"
// ToDo
//#endif
}
abuffer *cConvert::reencode_mpa_frame(mpeg_audio_frame *mpa_frame,
float volume)
{
int c, len;
short *tmp;
if (decoder_open < 0 || encoder_open < 0)
return &encoder_buf;
if (strcmp(encoder_codec->name, "mp2") == 0 && volume == 1) {
mpa_frame_buf.data = mpa_frame->data;
mpa_frame_buf.offset = mpa_frame->length;
return &mpa_frame_buf;
}
decode_mpa_frame(mpa_frame);
if (volume != 1) {
/* manipulate the volume */
len = decoder_buf.length / sizeof(short);
tmp = (short *)decoder_buf.data;
for (c = 0; c < len; ++c) {
*(tmp) = (short)((float)*(tmp) * volume);
++tmp;
}
}
#ifndef AVCODEC_NEW
encoder_buf.offset = avcodec_encode_audio(encoder_ctx, encoder_buf.data,
encoder_buf.length, (short *)decoder_buf.data);
/* encoder_buf.offset is used to save the size of the encoded frame */
#else
#warning "you have enabled -DAVCODEC_NEW in Makefile"
#warning "this is still under development,"
#warning "and will compile not working code..."
// https://www.ffmpeg.org/doxygen/1.0/group__lavc__encoding.html#gf12a9da0d33f50ff406e03572fab4763
// https://www.ffmpeg.org/doxygen/1.0/decoding__encoding_8c-source.html#l00102
/* int avcodec_encode_audio2
(
AVCodecContext * avctx,
AVPacket * avpkt,
const AVFrame * frame,
int * got_packet_ptr
) */
AVCodecContext *codec_ctx;
AVFrame *frame;
AVPacket avpkt;
av_init_packet(&avpkt);
avpkt.data = mpa_frame->data;
avpkt.size = mpa_frame->length;
int ret, got_output;
/* frame containing input raw audio */
frame = avcodec_alloc_frame();
if (!frame) {
dsyslog("[audiorecorder]: Could not allocate audio frame (%s, " "%s())", __FILE__, __func__);
return;
// fprintf(stderr, "Could not allocate audio frame\n");
// exit(1);
}
encoder_buf.offset = avcodec_encode_audio2(encoder_ctx, &avpkt, frame, &got_output);
if (ret < 0) {
dsyslog("[audiorecorder]: Error encoding audio frame (%s, " "%s())", __FILE__, __func__);
return;
// fprintf(stderr, "Error encoding audio frame\n");
// exit(1);
}
#endif
return &encoder_buf;
}
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