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| #include <stdio.h>
extern "C"
{
#include "libavcodec/avcodec.h"
}
#define AUDIO_INBUF_SIZE 40960
#define AUDIO_REFILL_THRESH 8192
#define INPUT_FILE_NAME "WavinFlag.aac"
#define OUTPUT_FILE_NAME "lh_online.pcm"
static int get_format_from_sample_fmt(const char** fmt,
enum AVSampleFormat sample_fmt)
{
int i;
struct sample_fmt_entry {
enum AVSampleFormat sample_fmt; const char* fmt_be, * fmt_le;
} sample_fmt_entries[] = {
{ AV_SAMPLE_FMT_U8, "u8", "u8" },
{ AV_SAMPLE_FMT_S16, "s16be", "s16le" },
{ AV_SAMPLE_FMT_S32, "s32be", "s32le" },
{ AV_SAMPLE_FMT_FLT, "f32be", "f32le" },
{ AV_SAMPLE_FMT_DBL, "f64be", "f64le" },
};
*fmt = NULL;
for (i = 0; i < FF_ARRAY_ELEMS(sample_fmt_entries); i++) {
struct sample_fmt_entry* entry = &sample_fmt_entries[i];
if (sample_fmt == entry->sample_fmt) {
*fmt = AV_NE(entry->fmt_be, entry->fmt_le);
return 0;
}
}
av_log(NULL, AV_LOG_ERROR, "sample format %s is not supported as output format\n", av_get_sample_fmt_name(sample_fmt));
return -1;
}
static void decode(AVCodecContext* dec_ctx, AVFrame* frame, AVPacket* pkt,
FILE* ofile)
{
int i, ch;
int ret, data_size;
ret = avcodec_send_packet(dec_ctx, pkt);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "发送数据包到解码器出错。\n");
exit(1);
}
while (ret >= 0) {
ret = avcodec_receive_frame(dec_ctx, frame);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
return;
else if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Error sending a packet for decoding.\n");
exit(1);
}
printf("frame_number: %d \n", dec_ctx->frame_number);
data_size = av_get_bytes_per_sample(dec_ctx->sample_fmt);
if (data_size < 0) {
av_log(NULL, AV_LOG_ERROR, "Failed to calculate data size.\n");
exit(1);
}
for (i = 0; i < frame->nb_samples; i++) {
for (ch = 0; ch < dec_ctx->channels; ch++) {
fwrite(frame->data[ch] + data_size * i, 1, data_size, ofile);
}
}
}
}
int main(int argc, char* argv[])
{
const AVCodec* codec;
AVCodecParserContext* parser;
AVCodecContext* c = NULL;
FILE* ifile, * ofile;
AVFrame* frame;
AVPacket* pkt;
uint8_t inbuf[AUDIO_INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
uint8_t* data;
size_t data_size;
int ret,len;
enum AVSampleFormat sfmt;
const char* fmt;
memset(inbuf + AUDIO_INBUF_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
codec = avcodec_find_decoder(AV_CODEC_ID_AAC);
if (!codec) {
av_log(NULL, AV_LOG_ERROR, "Codec not found.\n");
exit(1);
}
parser = av_parser_init(codec->id);
if (!parser) {
av_log(NULL, AV_LOG_ERROR, "parser not found.\n");
exit(1);
}
c = avcodec_alloc_context3(codec);
if (!c) {
av_log(NULL, AV_LOG_ERROR, "Could not allocate video codec context.\n");
exit(1);
}
if (avcodec_open2(c, codec, NULL) < 0) {
av_log(NULL, AV_LOG_ERROR, "Could not open codec.\n");
exit(1);
}
pkt = av_packet_alloc();
if (!pkt) {
exit(1);
}
frame = av_frame_alloc();
if (!frame) {
exit(1);
}
ifile = fopen(INPUT_FILE_NAME, "rb");
if (!ifile) {
av_log(NULL, AV_LOG_ERROR, "Could not open \s.\n", INPUT_FILE_NAME);
exit(1);
}
ofile = fopen(OUTPUT_FILE_NAME, "wb+");
if (!ofile) {
av_log(NULL, AV_LOG_ERROR, "Could not open \s.\n", OUTPUT_FILE_NAME);
exit(1);
}
data = inbuf;
data_size = fread(inbuf, 1, AUDIO_INBUF_SIZE, ifile);
while (data_size > 0) {
ret = av_parser_parse2(parser, c, &pkt->data, &pkt->size,
data, data_size,
AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
if (ret < 0) {
fprintf(stderr, "Error while parsing\n");
exit(1);
}
data += ret;
data_size -= ret;
if (pkt->size)
decode(c, frame, pkt, ofile);
if (data_size < AUDIO_REFILL_THRESH) {
memmove(inbuf, data, data_size);
data = inbuf;
len = fread(data + data_size, 1,
AUDIO_INBUF_SIZE - data_size, ifile);
if (len > 0)
data_size += len;
}
}
decode(c, frame, NULL, ofile);
printf("channels: %d \n", c->channels);
printf("sample_rate: %d \n", c->sample_rate);
printf("buffer: %d \n", av_samples_get_buffer_size(NULL, c->channels, c->frame_size, c->sample_fmt, 1));
sfmt = c->sample_fmt;
printf("sample_fmt: %s \n", av_get_sample_fmt_name(sfmt));
if (av_sample_fmt_is_planar(sfmt)) {
const char* packed = av_get_sample_fmt_name(sfmt);
sfmt = av_get_packed_sample_fmt(sfmt);
}
if (get_format_from_sample_fmt(&fmt, sfmt) < 0) {
av_log(NULL, AV_LOG_ERROR, "Could not get forma \s.\n", av_get_sample_fmt_name(sfmt));
exit(1);
}
printf("Play the output audio file with the command:\n"
"ffplay -f %s -ac %d -ar %d %s\n",
fmt, c->channels, c->sample_rate,OUTPUT_FILE_NAME);
fclose(ifile);
fclose(ofile);
av_parser_close(parser);
avcodec_free_context(&c);
av_frame_free(&frame);
av_packet_free(&pkt);
return 0;
}
|
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