-/* avcodec API use example.
+/**
+ * @file apiexample.c
+ * avcodec API use example.
*
* Note that this library only handles codecs (mpeg, mpeg4, etc...),
- * not file formats (avi, vob, etc...). See library 'libav' for the
+ * not file formats (avi, vob, etc...). See library 'libavformat' for the
* format handling
*/
+
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
+#ifdef HAVE_AV_CONFIG_H
+#undef HAVE_AV_CONFIG_H
+#endif
+
#include "avcodec.h"
#define INBUF_SIZE 4096
FILE *f;
short *samples;
float t, tincr;
- UINT8 *outbuf;
+ uint8_t *outbuf;
printf("Audio encoding\n");
outbuf_size = 10000;
outbuf = malloc(outbuf_size);
- f = fopen(filename, "w");
+ f = fopen(filename, "wb");
if (!f) {
fprintf(stderr, "could not open %s\n", filename);
exit(1);
AVCodecContext *c= NULL;
int out_size, size, len;
FILE *f, *outfile;
- UINT8 *outbuf;
- UINT8 inbuf[INBUF_SIZE], *inbuf_ptr;
+ uint8_t *outbuf;
+ uint8_t inbuf[INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE], *inbuf_ptr;
printf("Audio decoding\n");
+
+ /* set end of buffer to 0 (this ensures that no overreading happens for damaged mpeg streams) */
+ memset(inbuf + INBUF_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
/* find the mpeg audio decoder */
codec = avcodec_find_decoder(CODEC_ID_MP2);
outbuf = malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE);
- f = fopen(filename, "r");
+ f = fopen(filename, "rb");
if (!f) {
fprintf(stderr, "could not open %s\n", filename);
exit(1);
}
- outfile = fopen(outfilename, "w");
+ outfile = fopen(outfilename, "wb");
if (!outfile) {
free(c);
exit(1);
int i, out_size, size, x, y, outbuf_size;
FILE *f;
AVFrame *picture;
- UINT8 *outbuf, *picture_buf;
+ uint8_t *outbuf, *picture_buf;
printf("Video encoding\n");
c->width = 352;
c->height = 288;
/* frames per second */
- c->frame_rate = 25 * FRAME_RATE_BASE;
+ c->frame_rate = 25;
+ c->frame_rate_base= 1;
c->gop_size = 10; /* emit one intra frame every ten frames */
+ c->max_b_frames=1;
/* open it */
if (avcodec_open(c, codec) < 0) {
/* the codec gives us the frame size, in samples */
- f = fopen(filename, "w");
+ f = fopen(filename, "wb");
if (!f) {
fprintf(stderr, "could not open %s\n", filename);
exit(1);
/* encode 1 second of video */
for(i=0;i<25;i++) {
- printf("encoding frame %3d\r", i);
fflush(stdout);
/* prepare a dummy image */
/* Y */
/* encode the image */
out_size = avcodec_encode_video(c, outbuf, outbuf_size, picture);
+ printf("encoding frame %3d (size=%5d)\n", i, out_size);
+ fwrite(outbuf, 1, out_size, f);
+ }
+
+ /* get the delayed frames */
+ for(; out_size; i++) {
+ fflush(stdout);
+
+ out_size = avcodec_encode_video(c, outbuf, outbuf_size, NULL);
+ printf("write frame %3d (size=%5d)\n", i, out_size);
fwrite(outbuf, 1, out_size, f);
}
int frame, size, got_picture, len;
FILE *f;
AVFrame *picture;
- UINT8 inbuf[INBUF_SIZE], *inbuf_ptr;
+ uint8_t inbuf[INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE], *inbuf_ptr;
char buf[1024];
+ /* set end of buffer to 0 (this ensures that no overreading happens for damaged mpeg streams) */
+ memset(inbuf + INBUF_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+
printf("Video decoding\n");
/* find the mpeg1 video decoder */
/* the codec gives us the frame size, in samples */
- f = fopen(filename, "r");
+ f = fopen(filename, "rb");
if (!f) {
fprintf(stderr, "could not open %s\n", filename);
exit(1);
exit(1);
}
if (got_picture) {
- printf("saving frame %3d\r", frame);
+ printf("saving frame %3d\n", frame);
fflush(stdout);
/* the picture is allocated by the decoder. no need to
len = avcodec_decode_video(c, picture, &got_picture,
NULL, 0);
if (got_picture) {
- printf("saving frame %3d\r", frame);
+ printf("saving last frame %3d\n", frame);
fflush(stdout);
/* the picture is allocated by the decoder. no need to
printf("\n");
}
+// simple example how the options could be used
+int options_example(int argc, char* argv[])
+{
+ AVCodec* codec = avcodec_find_encoder_by_name((argc > 1) ? argv[2] : "mpeg4");
+ const AVOption* c;
+ AVCodecContext* avctx;
+ char* def = av_malloc(5000);
+ const char* col = "";
+ int i = 0;
+
+ if (!codec)
+ return -1;
+ c = codec->options;
+ avctx = avcodec_alloc_context();
+ *def = 0;
+
+ if (c) {
+ const AVOption *stack[FF_OPT_MAX_DEPTH];
+ int depth = 0;
+ for (;;) {
+ if (!c->name) {
+ if (c->help) {
+ stack[depth++] = c;
+ c = (const AVOption*)c->help;
+ } else {
+ if (depth == 0)
+ break; // finished
+ c = stack[--depth];
+ c++;
+ }
+ } else {
+ int t = c->type & FF_OPT_TYPE_MASK;
+ printf("Config %s %s\n",
+ t == FF_OPT_TYPE_BOOL ? "bool " :
+ t == FF_OPT_TYPE_DOUBLE ? "double " :
+ t == FF_OPT_TYPE_INT ? "integer" :
+ t == FF_OPT_TYPE_STRING ? "string " :
+ "unknown??", c->name);
+ switch (t) {
+ case FF_OPT_TYPE_BOOL:
+ i += sprintf(def + i, "%s%s=%s",
+ col, c->name,
+ c->defval != 0. ? "on" : "off");
+ break;
+ case FF_OPT_TYPE_DOUBLE:
+ i += sprintf(def + i, "%s%s=%f",
+ col, c->name, c->defval);
+ break;
+ case FF_OPT_TYPE_INT:
+ i += sprintf(def + i, "%s%s=%d",
+ col, c->name, (int) c->defval);
+ break;
+ case FF_OPT_TYPE_STRING:
+ if (c->defstr) {
+ char* d = av_strdup(c->defstr);
+ char* f = strchr(d, ',');
+ if (f)
+ *f = 0;
+ i += sprintf(def + i, "%s%s=%s",
+ col, c->name, d);
+ av_free(d);
+ }
+ break;
+ }
+ col = ":";
+ c++;
+ }
+ }
+ }
+ printf("Default Options: %s\n", def);
+ av_free(def);
+ return 0;
+}
+
int main(int argc, char **argv)
{
/* register all the codecs (you can also register only the codec
you wish to have smaller code */
avcodec_register_all();
-
+
+#ifdef OPT_TEST
+ options_example(argc, argv);
+#else
if (argc <= 1) {
audio_encode_example("/tmp/test.mp2");
audio_decode_example("/tmp/test.sw", "/tmp/test.mp2");
// audio_decode_example("/tmp/test.sw", filename);
video_decode_example("/tmp/test%d.pgm", filename);
+#endif
return 0;
}
projects / ffmpeg / blobdiff