diff options
Diffstat (limited to 'chromium/third_party/ffmpeg/doc/examples/decoding_encoding.c')
| -rw-r--r-- | chromium/third_party/ffmpeg/doc/examples/decoding_encoding.c | 58 |
1 files changed, 36 insertions, 22 deletions
diff --git a/chromium/third_party/ffmpeg/doc/examples/decoding_encoding.c b/chromium/third_party/ffmpeg/doc/examples/decoding_encoding.c index 99aeb1c8ace..0585e518ad5 100644 --- a/chromium/third_party/ffmpeg/doc/examples/decoding_encoding.c +++ b/chromium/third_party/ffmpeg/doc/examples/decoding_encoding.c @@ -24,10 +24,10 @@ * @file * libavcodec API use example. * + * @example decoding_encoding.c * Note that libavcodec only handles codecs (mpeg, mpeg4, etc...), * not file formats (avi, vob, mp4, mov, mkv, mxf, flv, mpegts, mpegps, etc...). See library 'libavformat' for the * format handling - * @example doc/examples/decoding_encoding.c */ #include <math.h> @@ -170,6 +170,10 @@ static void audio_encode_example(const char *filename) * we calculate the size of the samples buffer in bytes */ buffer_size = av_samples_get_buffer_size(NULL, c->channels, c->frame_size, c->sample_fmt, 0); + if (buffer_size < 0) { + fprintf(stderr, "Could not get sample buffer size\n"); + exit(1); + } samples = av_malloc(buffer_size); if (!samples) { fprintf(stderr, "Could not allocate %d bytes for samples buffer\n", @@ -187,7 +191,7 @@ static void audio_encode_example(const char *filename) /* encode a single tone sound */ t = 0; tincr = 2 * M_PI * 440.0 / c->sample_rate; - for(i=0;i<200;i++) { + for (i = 0; i < 200; i++) { av_init_packet(&pkt); pkt.data = NULL; // packet data will be allocated by the encoder pkt.size = 0; @@ -227,7 +231,7 @@ static void audio_encode_example(const char *filename) fclose(f); av_freep(&samples); - avcodec_free_frame(&frame); + av_frame_free(&frame); avcodec_close(c); av_free(c); } @@ -291,8 +295,7 @@ static void audio_decode_example(const char *outfilename, const char *filename) fprintf(stderr, "Could not allocate audio frame\n"); exit(1); } - } else - avcodec_get_frame_defaults(decoded_frame); + } len = avcodec_decode_audio4(c, decoded_frame, &got_frame, &avpkt); if (len < 0) { @@ -304,6 +307,11 @@ static void audio_decode_example(const char *outfilename, const char *filename) int data_size = av_samples_get_buffer_size(NULL, c->channels, decoded_frame->nb_samples, c->sample_fmt, 1); + if (data_size < 0) { + /* This should not occur, checking just for paranoia */ + fprintf(stderr, "Failed to calculate data size\n"); + exit(1); + } fwrite(decoded_frame->data[0], 1, data_size, outfile); } avpkt.size -= len; @@ -329,7 +337,7 @@ static void audio_decode_example(const char *outfilename, const char *filename) avcodec_close(c); av_free(c); - avcodec_free_frame(&decoded_frame); + av_frame_free(&decoded_frame); } /* @@ -366,12 +374,18 @@ static void video_encode_example(const char *filename, int codec_id) c->width = 352; c->height = 288; /* frames per second */ - c->time_base= (AVRational){1,25}; - c->gop_size = 10; /* emit one intra frame every ten frames */ - c->max_b_frames=1; + c->time_base = (AVRational){1,25}; + /* emit one intra frame every ten frames + * check frame pict_type before passing frame + * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I + * then gop_size is ignored and the output of encoder + * will always be I frame irrespective to gop_size + */ + c->gop_size = 10; + c->max_b_frames = 1; c->pix_fmt = AV_PIX_FMT_YUV420P; - if(codec_id == AV_CODEC_ID_H264) + if (codec_id == AV_CODEC_ID_H264) av_opt_set(c->priv_data, "preset", "slow", 0); /* open it */ @@ -405,7 +419,7 @@ static void video_encode_example(const char *filename, int codec_id) } /* encode 1 second of video */ - for(i=0;i<25;i++) { + for (i = 0; i < 25; i++) { av_init_packet(&pkt); pkt.data = NULL; // packet data will be allocated by the encoder pkt.size = 0; @@ -413,15 +427,15 @@ static void video_encode_example(const char *filename, int codec_id) fflush(stdout); /* prepare a dummy image */ /* Y */ - for(y=0;y<c->height;y++) { - for(x=0;x<c->width;x++) { + for (y = 0; y < c->height; y++) { + for (x = 0; x < c->width; x++) { frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3; } } /* Cb and Cr */ - for(y=0;y<c->height/2;y++) { - for(x=0;x<c->width/2;x++) { + for (y = 0; y < c->height/2; y++) { + for (x = 0; x < c->width/2; x++) { frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2; frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5; } @@ -467,7 +481,7 @@ static void video_encode_example(const char *filename, int codec_id) avcodec_close(c); av_free(c); av_freep(&frame->data[0]); - avcodec_free_frame(&frame); + av_frame_free(&frame); printf("\n"); } @@ -481,10 +495,10 @@ static void pgm_save(unsigned char *buf, int wrap, int xsize, int ysize, FILE *f; int i; - f=fopen(filename,"w"); - fprintf(f,"P5\n%d %d\n%d\n",xsize,ysize,255); - for(i=0;i<ysize;i++) - fwrite(buf + i * wrap,1,xsize,f); + f = fopen(filename,"w"); + fprintf(f, "P5\n%d %d\n%d\n", xsize, ysize, 255); + for (i = 0; i < ysize; i++) + fwrite(buf + i * wrap, 1, xsize, f); fclose(f); } @@ -572,7 +586,7 @@ static void video_decode_example(const char *outfilename, const char *filename) } frame_count = 0; - for(;;) { + for (;;) { avpkt.size = fread(inbuf, 1, INBUF_SIZE, f); if (avpkt.size == 0) break; @@ -609,7 +623,7 @@ static void video_decode_example(const char *outfilename, const char *filename) avcodec_close(c); av_free(c); - avcodec_free_frame(&frame); + av_frame_free(&frame); printf("\n"); } |