[FFmpeg-cvslog] examples/avcodec: split the remaining two examples into separate files
Anton Khirnov
git at videolan.org
Wed Mar 29 15:13:52 EEST 2017
ffmpeg | branch: master | Anton Khirnov <anton at khirnov.net> | Wed Oct 19 21:05:22 2016 +0200| [7b1f03477f1a43d2261fbd83e50a4ad90c7f806d] | committer: Anton Khirnov
examples/avcodec: split the remaining two examples into separate files
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7b1f03477f1a43d2261fbd83e50a4ad90c7f806d
---
configure | 6 +-
doc/Makefile | 12 +-
doc/examples/{avcodec.c => decode_video.c} | 176 +++--------------------------
doc/examples/encode_video.c | 164 +++++++++++++++++++++++++++
4 files changed, 192 insertions(+), 166 deletions(-)
diff --git a/configure b/configure
index b19e3e1..9264bb5 100755
--- a/configure
+++ b/configure
@@ -1209,9 +1209,10 @@ COMPONENT_LIST="
"
EXAMPLE_LIST="
- avcodec_example
decode_audio_example
+ decode_video_example
encode_audio_example
+ encode_video_example
filter_audio_example
metadata_example
output_example
@@ -2436,9 +2437,10 @@ scale_qsv_filter_deps="libmfx"
scale_vaapi_filter_deps="vaapi VAProcPipelineParameterBuffer"
# examples
-avcodec_example_deps="avcodec avutil"
decode_audio_example_deps="avcodec avutil"
+decode_video_example_deps="avcodec avutil"
encode_audio_example_deps="avcodec avutil"
+encode_video_example_deps="avcodec avutil"
filter_audio_example_deps="avfilter avutil"
metadata_example_deps="avformat avutil"
output_example_deps="avcodec avformat avutil swscale"
diff --git a/doc/Makefile b/doc/Makefile
index 326bb12..bda8153 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -16,16 +16,22 @@ DOCS-$(CONFIG_POD2MAN) += $(MANPAGES) $(PODPAGES)
DOCS-$(CONFIG_TEXI2HTML) += $(HTMLPAGES)
DOCS = $(DOCS-yes)
-DOC_EXAMPLES-$(CONFIG_AVCODEC_EXAMPLE) += avcodec
DOC_EXAMPLES-$(CONFIG_DECODE_AUDIO_EXAMPLE) += decode_audio
+DOC_EXAMPLES-$(CONFIG_DECODE_VIDEO_EXAMPLE) += decode_video
DOC_EXAMPLES-$(CONFIG_ENCODE_AUDIO_EXAMPLE) += encode_audio
+DOC_EXAMPLES-$(CONFIG_ENCODE_VIDEO_EXAMPLE) += encode_video
DOC_EXAMPLES-$(CONFIG_FILTER_AUDIO_EXAMPLE) += filter_audio
DOC_EXAMPLES-$(CONFIG_METADATA_EXAMPLE) += metadata
DOC_EXAMPLES-$(CONFIG_OUTPUT_EXAMPLE) += output
DOC_EXAMPLES-$(CONFIG_QSVDEC_EXAMPLE) += qsvdec
DOC_EXAMPLES-$(CONFIG_TRANSCODE_AAC_EXAMPLE) += transcode_aac
-ALL_DOC_EXAMPLES = avcodec decode_audio encode_audio filter_audio metadata \
- output transcode_aac
+ALL_DOC_EXAMPLES = decode_audio \
+ decode_video \
+ encode_audio \
+ encode_video \
+ filter_audio \
+ metadata output \
+ transcode_aac \
DOC_EXAMPLES := $(DOC_EXAMPLES-yes:%=doc/examples/%$(EXESUF))
ALL_DOC_EXAMPLES := $(ALL_DOC_EXAMPLES:%=doc/examples/%$(EXESUF))
diff --git a/doc/examples/avcodec.c b/doc/examples/decode_video.c
similarity index 55%
rename from doc/examples/avcodec.c
rename to doc/examples/decode_video.c
index 4f7dc8b..20d11da 100644
--- a/doc/examples/avcodec.c
+++ b/doc/examples/decode_video.c
@@ -20,159 +20,23 @@
/**
* @file
- * libavcodec API use example.
+ * video decoding with libavcodec API example
*
- * @example avcodec.c
- * Note that this library only handles codecs (MPEG, MPEG-4, etc...),
- * not file formats (AVI, VOB, etc...). See library 'libavformat' for the
- * format handling.
+ * @example decode_video.c
*/
-#include <stdlib.h>
#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
-#ifdef HAVE_AV_CONFIG_H
-#undef HAVE_AV_CONFIG_H
-#endif
-
#include "libavcodec/avcodec.h"
-#include "libavutil/channel_layout.h"
+
#include "libavutil/common.h"
#include "libavutil/imgutils.h"
#include "libavutil/mathematics.h"
-#include "libavutil/samplefmt.h"
#define INBUF_SIZE 4096
-/*
- * Video encoding example
- */
-static void video_encode_example(const char *filename)
-{
- AVCodec *codec;
- AVCodecContext *c= NULL;
- int i, ret, x, y, got_output;
- FILE *f;
- AVFrame *picture;
- AVPacket pkt;
- uint8_t endcode[] = { 0, 0, 1, 0xb7 };
-
- printf("Video encoding\n");
-
- /* find the mpeg1video encoder */
- codec = avcodec_find_encoder(AV_CODEC_ID_MPEG1VIDEO);
- if (!codec) {
- fprintf(stderr, "codec not found\n");
- exit(1);
- }
-
- c = avcodec_alloc_context3(codec);
- picture = av_frame_alloc();
-
- /* put sample parameters */
- c->bit_rate = 400000;
- /* resolution must be a multiple of two */
- 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->pix_fmt = AV_PIX_FMT_YUV420P;
-
- /* open it */
- if (avcodec_open2(c, codec, NULL) < 0) {
- fprintf(stderr, "could not open codec\n");
- exit(1);
- }
-
- f = fopen(filename, "wb");
- if (!f) {
- fprintf(stderr, "could not open %s\n", filename);
- exit(1);
- }
-
- ret = av_image_alloc(picture->data, picture->linesize, c->width, c->height,
- c->pix_fmt, 32);
- if (ret < 0) {
- fprintf(stderr, "could not alloc raw picture buffer\n");
- exit(1);
- }
- picture->format = c->pix_fmt;
- picture->width = c->width;
- picture->height = c->height;
-
- /* encode 1 second of video */
- for(i=0;i<25;i++) {
- av_init_packet(&pkt);
- pkt.data = NULL; // packet data will be allocated by the encoder
- pkt.size = 0;
-
- fflush(stdout);
- /* prepare a dummy image */
- /* Y */
- for(y=0;y<c->height;y++) {
- for(x=0;x<c->width;x++) {
- picture->data[0][y * picture->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++) {
- picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
- picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
- }
- }
-
- picture->pts = i;
-
- /* encode the image */
- ret = avcodec_encode_video2(c, &pkt, picture, &got_output);
- if (ret < 0) {
- fprintf(stderr, "error encoding frame\n");
- exit(1);
- }
-
- if (got_output) {
- printf("encoding frame %3d (size=%5d)\n", i, pkt.size);
- fwrite(pkt.data, 1, pkt.size, f);
- av_packet_unref(&pkt);
- }
- }
-
- /* get the delayed frames */
- for (got_output = 1; got_output; i++) {
- fflush(stdout);
-
- ret = avcodec_encode_video2(c, &pkt, NULL, &got_output);
- if (ret < 0) {
- fprintf(stderr, "error encoding frame\n");
- exit(1);
- }
-
- if (got_output) {
- printf("encoding frame %3d (size=%5d)\n", i, pkt.size);
- fwrite(pkt.data, 1, pkt.size, f);
- av_packet_unref(&pkt);
- }
- }
-
- /* add sequence end code to have a real MPEG file */
- fwrite(endcode, 1, sizeof(endcode), f);
- fclose(f);
-
- avcodec_free_context(&c);
- av_freep(&picture->data[0]);
- av_frame_free(&picture);
- printf("\n");
-}
-
-/*
- * Video decoding example
- */
-
static void pgm_save(unsigned char *buf, int wrap, int xsize, int ysize,
char *filename)
{
@@ -186,8 +50,9 @@ static void pgm_save(unsigned char *buf, int wrap, int xsize, int ysize,
fclose(f);
}
-static void video_decode_example(const char *outfilename, const char *filename)
+int main(int argc, char **argv)
{
+ const char *filename, *outfilename;
AVCodec *codec;
AVCodecContext *c= NULL;
int frame, got_picture, len;
@@ -197,13 +62,20 @@ static void video_decode_example(const char *outfilename, const char *filename)
char buf[1024];
AVPacket avpkt;
+ if (argc <= 2) {
+ fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]);
+ exit(0);
+ }
+ filename = argv[1];
+ outfilename = argv[2];
+
+ avcodec_register_all();
+
av_init_packet(&avpkt);
/* set end of buffer to 0 (this ensures that no overreading happens for damaged MPEG streams) */
memset(inbuf + INBUF_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
- printf("Video decoding\n");
-
/* find the MPEG-1 video decoder */
codec = avcodec_find_decoder(AV_CODEC_ID_MPEG1VIDEO);
if (!codec) {
@@ -301,24 +173,6 @@ static void video_decode_example(const char *outfilename, const char *filename)
avcodec_free_context(&c);
av_frame_free(&picture);
- printf("\n");
-}
-
-int main(int argc, char **argv)
-{
- const char *filename;
-
- /* register all the codecs */
- avcodec_register_all();
-
- if (argc <= 1) {
- video_encode_example("/tmp/test.mpg");
- filename = "/tmp/test.mpg";
- } else {
- filename = argv[1];
- }
-
- video_decode_example("/tmp/test%d.pgm", filename);
return 0;
}
diff --git a/doc/examples/encode_video.c b/doc/examples/encode_video.c
new file mode 100644
index 0000000..ca93472
--- /dev/null
+++ b/doc/examples/encode_video.c
@@ -0,0 +1,164 @@
+/*
+ * copyright (c) 2001 Fabrice Bellard
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * video encoding with libavcodec API example
+ *
+ * @example encode_video.c
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libavcodec/avcodec.h"
+
+#include "libavutil/frame.h"
+#include "libavutil/imgutils.h"
+
+int main(int argc, char **argv)
+{
+ const char *filename;
+ AVCodec *codec;
+ AVCodecContext *c= NULL;
+ int i, ret, x, y, got_output;
+ FILE *f;
+ AVFrame *picture;
+ AVPacket pkt;
+ uint8_t endcode[] = { 0, 0, 1, 0xb7 };
+
+ if (argc <= 1) {
+ fprintf(stderr, "Usage: %s <output file>\n", argv[0]);
+ exit(0);
+ }
+ filename = argv[1];
+
+ avcodec_register_all();
+
+ /* find the mpeg1video encoder */
+ codec = avcodec_find_encoder(AV_CODEC_ID_MPEG1VIDEO);
+ if (!codec) {
+ fprintf(stderr, "codec not found\n");
+ exit(1);
+ }
+
+ c = avcodec_alloc_context3(codec);
+ picture = av_frame_alloc();
+
+ /* put sample parameters */
+ c->bit_rate = 400000;
+ /* resolution must be a multiple of two */
+ 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->pix_fmt = AV_PIX_FMT_YUV420P;
+
+ /* open it */
+ if (avcodec_open2(c, codec, NULL) < 0) {
+ fprintf(stderr, "could not open codec\n");
+ exit(1);
+ }
+
+ f = fopen(filename, "wb");
+ if (!f) {
+ fprintf(stderr, "could not open %s\n", filename);
+ exit(1);
+ }
+
+ ret = av_image_alloc(picture->data, picture->linesize, c->width, c->height,
+ c->pix_fmt, 32);
+ if (ret < 0) {
+ fprintf(stderr, "could not alloc raw picture buffer\n");
+ exit(1);
+ }
+ picture->format = c->pix_fmt;
+ picture->width = c->width;
+ picture->height = c->height;
+
+ /* encode 1 second of video */
+ for(i=0;i<25;i++) {
+ av_init_packet(&pkt);
+ pkt.data = NULL; // packet data will be allocated by the encoder
+ pkt.size = 0;
+
+ fflush(stdout);
+ /* prepare a dummy image */
+ /* Y */
+ for(y=0;y<c->height;y++) {
+ for(x=0;x<c->width;x++) {
+ picture->data[0][y * picture->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++) {
+ picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
+ picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
+ }
+ }
+
+ picture->pts = i;
+
+ /* encode the image */
+ ret = avcodec_encode_video2(c, &pkt, picture, &got_output);
+ if (ret < 0) {
+ fprintf(stderr, "error encoding frame\n");
+ exit(1);
+ }
+
+ if (got_output) {
+ printf("encoding frame %3d (size=%5d)\n", i, pkt.size);
+ fwrite(pkt.data, 1, pkt.size, f);
+ av_packet_unref(&pkt);
+ }
+ }
+
+ /* get the delayed frames */
+ for (got_output = 1; got_output; i++) {
+ fflush(stdout);
+
+ ret = avcodec_encode_video2(c, &pkt, NULL, &got_output);
+ if (ret < 0) {
+ fprintf(stderr, "error encoding frame\n");
+ exit(1);
+ }
+
+ if (got_output) {
+ printf("encoding frame %3d (size=%5d)\n", i, pkt.size);
+ fwrite(pkt.data, 1, pkt.size, f);
+ av_packet_unref(&pkt);
+ }
+ }
+
+ /* add sequence end code to have a real MPEG file */
+ fwrite(endcode, 1, sizeof(endcode), f);
+ fclose(f);
+
+ avcodec_free_context(&c);
+ av_freep(&picture->data[0]);
+ av_frame_free(&picture);
+
+ return 0;
+}
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