ffmpeg将mp4解封装为yuv以及pcm测试代码
#include
#include
#include
extern "C" {
#include "libavutil/imgutils.h"
#include "libavutil/samplefmt.h"
#include "libavformat/avformat.h"
}
#pragma warning(disable: 4996)
#define errReport(info, val) do{ \
fprintf(stderr, "ERR(func=%s,line=%d): %s code=%d\n",__FUNCTION__, __LINE__, info, val);\
getch();\
exit(0);\
}while (0);
typedef struct {
const char *src_filename;
const char *video_dst_filename;
const char *audio_dst_filename;
int refcount;
FILE *video_dst_file;
FILE *audio_dst_file;
} IOFileName;
typedef struct {
AVFormatContext *fmt_ctx;
AVCodecContext *video_dec_ctx, *audio_dec_ctx;
AVStream *video_stream, *audio_stream;
AVFrame *frame;
AVPacket pkt;
int video_stream_idx, audio_stream_idx;
int width, height;
uint8_t *video_dst_data[4];
int video_dst_linesize[4];
int video_dst_bufsize;
enum AVPixelFormat pix_fmt;
} DemuxingVideoAudioContex;
int decode_packet(IOFileName &files, DemuxingVideoAudioContex &va_ctx, int *got_frame, int cached) {
int ret = 0, decoded = va_ctx.pkt.size;
static int video_frame_count = 0;
static int audio_frame_count = 0;
*got_frame = 0;
if (va_ctx.pkt.stream_index == va_ctx.video_stream_idx) {
ret = avcodec_decode_video2(va_ctx.video_dec_ctx, va_ctx.frame, got_frame, &va_ctx.pkt);
if (ret < 0) return -1;
if (*got_frame) {
if (va_ctx.frame->width != va_ctx.width ||
va_ctx.frame->height != va_ctx.height ||
va_ctx.frame->format != va_ctx.pix_fmt)
return -2;
if (video_frame_count % 1 == 0) printf("\n");
printf("[v]%s c:%d n:%d ", cached ? "(cached)" : "", video_frame_count++, va_ctx.frame->coded_picture_number);
av_image_copy(va_ctx.video_dst_data, va_ctx.video_dst_linesize,
(const uint8_t **)(va_ctx.frame->data), va_ctx.frame->linesize,
va_ctx.pix_fmt, va_ctx.width, va_ctx.height);
fwrite(va_ctx.video_dst_data[0], 1, va_ctx.video_dst_bufsize, files.video_dst_file);
}
}
else if (va_ctx.pkt.stream_index == va_ctx.audio_stream_idx) {
ret = avcodec_decode_audio4(va_ctx.audio_dec_ctx, va_ctx.frame, got_frame, &va_ctx.pkt);
if (ret < 0) return -3;
decoded = FFMIN(ret, va_ctx.pkt.size);
if (*got_frame) {
size_t unpadded_linesize = va_ctx.frame->nb_samples * av_get_bytes_per_sample((AVSampleFormat)va_ctx.frame->format);
printf("[a]%s c:%d s:%d ", cached ? "(cached)" : "",
audio_frame_count++, va_ctx.frame->nb_samples);
fwrite(va_ctx.frame->extended_data[0], 1, unpadded_linesize, files.audio_dst_file);
}
}
if (*got_frame && files.refcount)
av_frame_unref(va_ctx.frame);
return decoded;
}
int open_codec_context(IOFileName &files, DemuxingVideoAudioContex &va_ctx, enum AVMediaType type) {
int ret, stream_index;
AVStream *st;
AVCodecContext *dec_ctx = NULL;
AVCodec *dec = NULL;
AVDictionary *opts = NULL;
ret = av_find_best_stream(va_ctx.fmt_ctx, type, -1, -1, NULL, 0);
if (ret < 0) return -1;
stream_index = ret;
st = va_ctx.fmt_ctx->streams[stream_index];
dec_ctx = st->codec;
dec = avcodec_find_decoder(dec_ctx->codec_id);
if (!dec) return -2;
av_dict_set(&opts, "refcounted_frames", files.refcount ? "1" : "0", 0);
if ((ret = avcodec_open2(dec_ctx, dec, &opts)) < 0) return -3;
switch (type) {
case AVMEDIA_TYPE_VIDEO:
va_ctx.video_stream_idx = stream_index;
va_ctx.video_stream = va_ctx.fmt_ctx->streams[stream_index];
va_ctx.video_dec_ctx = va_ctx.video_stream->codec;
break;
case AVMEDIA_TYPE_AUDIO:
va_ctx.audio_stream_idx = stream_index;
va_ctx.audio_stream = va_ctx.fmt_ctx->streams[stream_index];
va_ctx.audio_dec_ctx = va_ctx.audio_stream->codec;
break;
default:
return -4;
}
return 0;
}
int init_demux_context(IOFileName &files, DemuxingVideoAudioContex &va_ctx) {
int ret = 0;
av_register_all();
if (avformat_open_input(&(va_ctx.fmt_ctx), files.src_filename, NULL, NULL) < 0)
return -1;
if (avformat_find_stream_info(va_ctx.fmt_ctx, NULL) < 0)
return -2;
if (open_codec_context(files, va_ctx, AVMEDIA_TYPE_VIDEO) < 0)
return -3;
files.video_dst_file = fopen(files.video_dst_filename, "wb");
if (!files.video_dst_file) return -4;
va_ctx.width = va_ctx.video_dec_ctx->width;
va_ctx.height = va_ctx.video_dec_ctx->height;
va_ctx.pix_fmt = va_ctx.video_dec_ctx->pix_fmt;
ret = av_image_alloc(va_ctx.video_dst_data, va_ctx.video_dst_linesize, va_ctx.width, va_ctx.height, va_ctx.pix_fmt, 1);
if (ret < 0) return -5;
va_ctx.video_dst_bufsize = ret;
if (open_codec_context(files, va_ctx, AVMEDIA_TYPE_AUDIO) < 0)
return -6;
files.audio_dst_file = fopen(files.audio_dst_filename, "wb");
if (!files.audio_dst_file) return -7;
av_dump_format(va_ctx.fmt_ctx, 0, files.src_filename, 0);
if (!va_ctx.audio_stream && !va_ctx.video_stream)
return -8;
return 0;
}
void close_demux_context(IOFileName &files, DemuxingVideoAudioContex &va_ctx) {
avcodec_close(va_ctx.video_dec_ctx);
avcodec_close(va_ctx.audio_dec_ctx);
avformat_close_input(&(va_ctx.fmt_ctx));
av_frame_free(&va_ctx.frame);
av_free(va_ctx.video_dst_data[0]);
if (files.video_dst_file) fclose(files.video_dst_file);
if (files.audio_dst_file) fclose(files.audio_dst_file);
}
int main() {
int ret = 0, got_frame, frameNum = 0;
IOFileName files = { NULL };
DemuxingVideoAudioContex va_ctx = { NULL };
files.src_filename = "test.mp4";
files.video_dst_filename = "out.yuv";
files.audio_dst_filename = "out.pcm";
if ((ret = init_demux_context(files, va_ctx)) < 0)
errReport("init_demux_context", ret);
va_ctx.frame = av_frame_alloc();
if (!va_ctx.frame) errReport("av_frame_alloc", -1);
av_init_packet(&va_ctx.pkt);
va_ctx.pkt.data = NULL;
va_ctx.pkt.size = 0;
while (av_read_frame(va_ctx.fmt_ctx, &va_ctx.pkt) >= 0) {
do {
ret = decode_packet(files, va_ctx, &got_frame, 0);
if (ret < 0) break;
va_ctx.pkt.data += ret;
va_ctx.pkt.size -= ret;
} while (va_ctx.pkt.size > 0);
}
/* flush cached frames */
va_ctx.pkt.data = NULL;
va_ctx.pkt.size = 0;
do {
decode_packet(files, va_ctx, &got_frame, 1);
} while (got_frame);
printf("Demuxing succeeded.\n");
close_demux_context(files, va_ctx);
getch();
return 0;
} 结果：
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.26.100
Duration: 00:00:10.03, start: 0.023220, bitrate: 473 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 176x144,
402 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, flt
p, 64 kb/s (default)
Metadata:
handler_name : SoundHandler
[a] c:0 s:1024 [a] c:1 s:1024 [a] c:2 s:1024 [a] c:3 s:1024 [a] c:4 s:1024 [a] c
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[v] c:198 n:199 [a] c:349 s:1024 [a] c:350 s:1024
[v] c:199 n:198 [a] c:351 s:1024 [a] c:352 s:1024
[v] c:200 n:200 [a] c:353 s:1024 [a] c:354 s:1024
[v] c:201 n:202 [a] c:355 s:1024
[v] c:202 n:201 [a] c:356 s:1024 [a] c:357 s:1024
[v] c:203 n:203 [a] c:358 s:1024 [a] c:359 s:1024
[v] c:204 n:204 [a] c:360 s:1024 [a] c:361 s:1024
[v] c:205 n:206 [a] c:362 s:1024
[v] c:206 n:205 [a] c:363 s:1024 [a] c:364 s:1024
[v] c:207 n:208 [a] c:365 s:1024 [a] c:366 s:1024
[v] c:208 n:207 [a] c:367 s:1024
[v] c:209 n:210 [a] c:368 s:1024 [a] c:369 s:1024
[v] c:210 n:209 [a] c:370 s:1024 [a] c:371 s:1024
[v] c:211 n:212 [a] c:372 s:1024 [a] c:373 s:1024
[v] c:212 n:211 [a] c:374 s:1024
[v] c:213 n:214 [a] c:375 s:1024 [a] c:376 s:1024
[v] c:214 n:213 [a] c:377 s:1024 [a] c:378 s:1024
[v] c:215 n:215 [a] c:379 s:1024
[v] c:216 n:216 [a] c:380 s:1024 [a] c:381 s:1024
[v] c:217 n:218 [a] c:382 s:1024 [a] c:383 s:1024
[v] c:218 n:217 [a] c:384 s:1024 [a] c:385 s:1024
[v] c:219 n:220 [a] c:386 s:1024
[v] c:220 n:219 [a] c:387 s:1024 [a] c:388 s:1024
[v] c:221 n:222 [a] c:389 s:1024 [a] c:390 s:1024
[v] c:222 n:221 [a] c:391 s:1024 [a] c:392 s:1024
[v] c:223 n:224 [a] c:393 s:1024
[v] c:224 n:223 [a] c:394 s:1024 [a] c:395 s:1024
[v] c:225 n:225 [a] c:396 s:1024 [a] c:397 s:1024
[v] c:226 n:226 [a] c:398 s:1024
[v] c:227 n:227 [a] c:399 s:1024 [a] c:400 s:1024
[v] c:228 n:228 [a] c:401 s:1024 [a] c:402 s:1024
[v] c:229 n:229 [a] c:403 s:1024 [a] c:404 s:1024
[v] c:230 n:230 [a] c:405 s:1024
[v] c:231 n:232 [a] c:406 s:1024 [a] c:407 s:1024
[v] c:232 n:231 [a] c:408 s:1024 [a] c:409 s:1024
[v] c:233 n:234 [a] c:410 s:1024
[v] c:234 n:233 [a] c:411 s:1024 [a] c:412 s:1024
[v] c:235 n:236 [a] c:413 s:1024 [a] c:414 s:1024
[v] c:236 n:235 [a] c:415 s:1024 [a] c:416 s:1024
[v] c:237 n:238 [a] c:417 s:1024
[v] c:238 n:237 [a] c:418 s:1024 [a] c:419 s:1024
[v] c:239 n:239 [a] c:420 s:1024 [a] c:421 s:1024
[v] c:240 n:240 [a] c:422 s:1024 [a] c:423 s:1024
[v] c:241 n:241 [a] c:424 s:1024
[v] c:242 n:242 [a] c:425 s:1024 [a] c:426 s:1024
[v] c:243 n:244 [a] c:427 s:1024 [a] c:428 s:1024 [a] c:429 s:1024 [a] c:430 s:1
024 [a] c:431 s:1024
[v](cached) c:244 n:243
[v](cached) c:245 n:246
[v](cached) c:246 n:245
[v](cached) c:247 n:248
[v](cached) c:248 n:247
[v](cached) c:249 n:249 Demuxing succeeded.