Created
June 23, 2021 16:30
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extern "C" | |
{ | |
#include <libavcodec/avcodec.h> | |
#include <libavformat/avformat.h> | |
#include <libavutil/frame.h> | |
#include <libavutil/mem.h> | |
} | |
#include <cassert> | |
#include <iostream> | |
void check(int ret) | |
{ | |
if (ret < 0 && ret != AVERROR_EOF) | |
{ | |
char err[100]{0}; | |
av_make_error_string(err, 100, ret); | |
std::cerr << ret << ": " << err << "\n"; | |
} | |
} | |
int main() { | |
const char *filename = "04 - Rat King.flac"; | |
int ret{}; | |
av_register_all(); | |
avcodec_register_all(); | |
AVFormatContext *fmt_ctx{}; | |
ret = avformat_open_input(&fmt_ctx, filename, nullptr, nullptr); | |
check(ret); | |
assert(fmt_ctx); | |
ret = avformat_find_stream_info(fmt_ctx, nullptr); | |
check(ret); | |
AVStream *stream{}; | |
for (std::size_t i = 0; i < fmt_ctx->nb_streams; i++) { | |
if (fmt_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) { | |
stream = fmt_ctx->streams[i]; | |
break; | |
} | |
} | |
assert(stream); | |
auto codec = avcodec_find_decoder(stream->codecpar->codec_id); | |
assert(codec); | |
auto codec_ctx = avcodec_alloc_context3(codec); | |
assert(codec_ctx); | |
ret = avcodec_parameters_to_context(codec_ctx, stream->codecpar); | |
check(ret); | |
ret = avcodec_open2(codec_ctx, codec, nullptr); | |
check(ret); | |
AVPacket packet; | |
AVFrame* frame = av_frame_alloc(); | |
assert(frame); | |
ret = av_read_frame(fmt_ctx, &packet); | |
check(ret); | |
ret = avcodec_send_packet(codec_ctx, &packet); | |
check(ret); | |
ret = avcodec_receive_frame(codec_ctx, frame); | |
check(ret); | |
} |
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