-/* avcodec API use example.
+/*
+ * copyright (c) 2001 Fabrice Bellard
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @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
- * format handling
+ * 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>
+#define PI 3.14159265358979323846
+
+#ifdef HAVE_AV_CONFIG_H
+#undef HAVE_AV_CONFIG_H
+#endif
+
#include "avcodec.h"
#define INBUF_SIZE 4096
/*
- * Audio encoding example
+ * Audio encoding example
*/
void audio_encode_example(const char *filename)
{
AVCodec *codec;
- AVCodecContext codec_context, *c = &codec_context;
+ AVCodecContext *c= NULL;
int frame_size, i, j, out_size, outbuf_size;
FILE *f;
short *samples;
float t, tincr;
- UINT8 *outbuf;
+ uint8_t *outbuf;
printf("Audio encoding\n");
exit(1);
}
- /* put default values */
- memset(c, 0, sizeof(*c));
+ c= avcodec_alloc_context();
/* put sample parameters */
c->bit_rate = 64000;
fprintf(stderr, "could not open codec\n");
exit(1);
}
-
+
/* the codec gives us the frame size, in samples */
frame_size = c->frame_size;
samples = malloc(frame_size * 2 * c->channels);
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);
}
-
+
/* encode a single tone sound */
t = 0;
- tincr = 2 * M_PI * 440.0 / c->sample_rate;
+ tincr = 2 * PI * 440.0 / c->sample_rate;
for(i=0;i<200;i++) {
for(j=0;j<frame_size;j++) {
samples[2*j] = (int)(sin(t) * 10000);
free(samples);
avcodec_close(c);
+ av_free(c);
}
/*
- * Audio decoding.
+ * Audio decoding.
*/
void audio_decode_example(const char *outfilename, const char *filename)
{
AVCodec *codec;
- AVCodecContext codec_context, *c = &codec_context;
+ 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");
exit(1);
}
- /* put default values */
- memset(c, 0, sizeof(*c));
+ c= avcodec_alloc_context();
/* open it */
if (avcodec_open(c, codec) < 0) {
fprintf(stderr, "could not open codec\n");
exit(1);
}
-
+
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) {
- fprintf(stderr, "could not open %s\n", outfilename);
+ av_free(c);
exit(1);
}
-
+
/* decode until eof */
inbuf_ptr = inbuf;
for(;;) {
inbuf_ptr = inbuf;
while (size > 0) {
- len = avcodec_decode_audio(c, (short *)outbuf, &out_size,
+ len = avcodec_decode_audio(c, (short *)outbuf, &out_size,
inbuf_ptr, size);
if (len < 0) {
fprintf(stderr, "Error while decoding\n");
free(outbuf);
avcodec_close(c);
+ av_free(c);
}
/*
- * Video encoding example
+ * Video encoding example
*/
void video_encode_example(const char *filename)
{
AVCodec *codec;
- AVCodecContext codec_context, *c = &codec_context;
+ AVCodecContext *c= NULL;
int i, out_size, size, x, y, outbuf_size;
FILE *f;
- AVPicture picture;
- UINT8 *outbuf, *picture_buf;
+ AVFrame *picture;
+ uint8_t *outbuf, *picture_buf;
printf("Video encoding\n");
exit(1);
}
- /* put default values */
- memset(c, 0, sizeof(*c));
+ c= avcodec_alloc_context();
+ picture= avcodec_alloc_frame();
/* put sample parameters */
c->bit_rate = 400000;
/* resolution must be a multiple of two */
- c->width = 352;
+ c->width = 352;
c->height = 288;
/* frames per second */
- c->frame_rate = 25 * FRAME_RATE_BASE;
+ 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 = PIX_FMT_YUV420P;
/* open it */
if (avcodec_open(c, codec) < 0) {
fprintf(stderr, "could not open codec\n");
exit(1);
}
-
- /* 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);
}
-
+
/* alloc image and output buffer */
outbuf_size = 100000;
outbuf = malloc(outbuf_size);
size = c->width * c->height;
picture_buf = malloc((size * 3) / 2); /* size for YUV 420 */
-
- picture.data[0] = picture_buf;
- picture.data[1] = picture.data[0] + size;
- picture.data[2] = picture.data[1] + size / 4;
- picture.linesize[0] = c->width;
- picture.linesize[1] = c->width / 2;
- picture.linesize[2] = c->width / 2;
+
+ picture->data[0] = picture_buf;
+ picture->data[1] = picture->data[0] + size;
+ picture->data[2] = picture->data[1] + size / 4;
+ picture->linesize[0] = c->width;
+ picture->linesize[1] = c->width / 2;
+ picture->linesize[2] = c->width / 2;
/* encode 1 second of video */
for(i=0;i<25;i++) {
- printf("encoding frame %3d\r", i);
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;
+ 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->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
+ picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
}
}
/* encode the image */
- out_size = avcodec_encode_video(c, outbuf, outbuf_size, &picture);
+ 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);
+ av_free(c);
+ av_free(picture);
printf("\n");
}
/*
- * Video decoding example
+ * Video decoding example
*/
-void pgm_save(unsigned char *buf,int wrap, int xsize,int ysize,char *filename)
+void pgm_save(unsigned char *buf,int wrap, int xsize,int ysize,char *filename)
{
FILE *f;
int i;
void video_decode_example(const char *outfilename, const char *filename)
{
AVCodec *codec;
- AVCodecContext codec_context, *c = &codec_context;
+ AVCodecContext *c= NULL;
int frame, size, got_picture, len;
FILE *f;
- AVPicture picture;
- UINT8 inbuf[INBUF_SIZE], *inbuf_ptr;
+ AVFrame *picture;
+ 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 */
exit(1);
}
- /* put default values */
- memset(c, 0, sizeof(*c));
+ c= avcodec_alloc_context();
+ picture= avcodec_alloc_frame();
- /* for some codecs, such as msmpeg4 and opendivx, width and height
- MUST be initialized there because these info are not available
- in the bitstream */
+ if(codec->capabilities&CODEC_CAP_TRUNCATED)
+ c->flags|= CODEC_FLAG_TRUNCATED; /* we do not send complete frames */
+
+ /* For some codecs, such as msmpeg4 and mpeg4, width and height
+ MUST be initialized there because this information is not
+ available in the bitstream. */
/* open it */
if (avcodec_open(c, codec) < 0) {
fprintf(stderr, "could not open codec\n");
exit(1);
}
-
+
/* 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);
}
-
+
frame = 0;
for(;;) {
size = fread(inbuf, 1, INBUF_SIZE, f);
/* NOTE1: some codecs are stream based (mpegvideo, mpegaudio)
and this is the only method to use them because you cannot
- know the compressed data size before analysing it.
+ know the compressed data size before analysing it.
- BUT some other codecs (msmpeg4, opendivx) are inherently
- frame based, so you must call them with all the data for
- one frame exactly. You must also initialize 'width' and
+ BUT some other codecs (msmpeg4, mpeg4) are inherently frame
+ based, so you must call them with all the data for one
+ frame exactly. You must also initialize 'width' and
'height' before initializing them. */
/* NOTE2: some codecs allow the raw parameters (frame size,
feed decoder and see if it could decode a frame */
inbuf_ptr = inbuf;
while (size > 0) {
- len = avcodec_decode_video(c, &picture, &got_picture,
+ len = avcodec_decode_video(c, picture, &got_picture,
inbuf_ptr, size);
if (len < 0) {
fprintf(stderr, "Error while decoding frame %d\n", frame);
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
free it */
snprintf(buf, sizeof(buf), outfilename, frame);
- pgm_save(picture.data[0], picture.linesize[0],
+ pgm_save(picture->data[0], picture->linesize[0],
c->width, c->height, buf);
frame++;
}
/* some codecs, such as MPEG, transmit the I and P frame with a
latency of one frame. You must do the following to have a
chance to get the last frame of the video */
- len = avcodec_decode_video(c, &picture, &got_picture,
+ 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
free it */
snprintf(buf, sizeof(buf), outfilename, frame);
- pgm_save(picture.data[0], picture.linesize[0],
+ pgm_save(picture->data[0], picture->linesize[0],
c->width, c->height, buf);
frame++;
}
-
+
fclose(f);
avcodec_close(c);
+ av_free(c);
+ av_free(picture);
printf("\n");
}
-
int main(int argc, char **argv)
{
const char *filename;
/* must be called before using avcodec lib */
avcodec_init();
- /* register all the codecs (you can also register only the codec
- you wish to have smaller code */
+ /* register all the codecs */
avcodec_register_all();
-
+
if (argc <= 1) {
audio_encode_example("/tmp/test.mp2");
audio_decode_example("/tmp/test.sw", "/tmp/test.mp2");