-/* 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>
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);
free(samples);
avcodec_close(c);
- free(c);
+ av_free(c);
}
/*
int out_size, size, len;
FILE *f, *outfile;
uint8_t *outbuf;
- uint8_t inbuf[INBUF_SIZE], *inbuf_ptr;
+ 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);
+ av_free(c);
exit(1);
}
free(outbuf);
avcodec_close(c);
- free(c);
+ av_free(c);
}
/*
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);
}
free(outbuf);
avcodec_close(c);
- free(c);
- free(picture);
+ av_free(c);
+ av_free(picture);
printf("\n");
}
int frame, size, got_picture, len;
FILE *f;
AVFrame *picture;
- uint8_t 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
fclose(f);
avcodec_close(c);
- free(c);
- free(picture);
+ av_free(c);
+ av_free(picture);
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->sub) {
- stack[depth++] = c;
- c = c->sub;
- } 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)
{
const char *filename;
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