+++ /dev/null
-/**
- * @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 '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
-
-/*
- * Audio encoding example
- */
-void audio_encode_example(const char *filename)
-{
- AVCodec *codec;
- AVCodecContext *c= NULL;
- int frame_size, i, j, out_size, outbuf_size;
- FILE *f;
- short *samples;
- float t, tincr;
- uint8_t *outbuf;
-
- printf("Audio encoding\n");
-
- /* find the MP2 encoder */
- codec = avcodec_find_encoder(CODEC_ID_MP2);
- if (!codec) {
- fprintf(stderr, "codec not found\n");
- exit(1);
- }
-
- c= avcodec_alloc_context();
-
- /* put sample parameters */
- c->bit_rate = 64000;
- c->sample_rate = 44100;
- c->channels = 2;
-
- /* 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 */
- frame_size = c->frame_size;
- samples = malloc(frame_size * 2 * c->channels);
- outbuf_size = 10000;
- outbuf = malloc(outbuf_size);
-
- f = fopen(filename, "w");
- 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;
- for(i=0;i<200;i++) {
- for(j=0;j<frame_size;j++) {
- samples[2*j] = (int)(sin(t) * 10000);
- samples[2*j+1] = samples[2*j];
- t += tincr;
- }
- /* encode the samples */
- out_size = avcodec_encode_audio(c, outbuf, outbuf_size, samples);
- fwrite(outbuf, 1, out_size, f);
- }
- fclose(f);
- free(outbuf);
- free(samples);
-
- avcodec_close(c);
- free(c);
-}
-
-/*
- * Audio decoding.
- */
-void audio_decode_example(const char *outfilename, const char *filename)
-{
- AVCodec *codec;
- AVCodecContext *c= NULL;
- int out_size, size, len;
- FILE *f, *outfile;
- 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);
- if (!codec) {
- fprintf(stderr, "codec not found\n");
- exit(1);
- }
-
- 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");
- if (!f) {
- fprintf(stderr, "could not open %s\n", filename);
- exit(1);
- }
- outfile = fopen(outfilename, "w");
- if (!outfile) {
- free(c);
- exit(1);
- }
-
- /* decode until eof */
- inbuf_ptr = inbuf;
- for(;;) {
- size = fread(inbuf, 1, INBUF_SIZE, f);
- if (size == 0)
- break;
-
- inbuf_ptr = inbuf;
- while (size > 0) {
- len = avcodec_decode_audio(c, (short *)outbuf, &out_size,
- inbuf_ptr, size);
- if (len < 0) {
- fprintf(stderr, "Error while decoding\n");
- exit(1);
- }
- if (out_size > 0) {
- /* if a frame has been decoded, output it */
- fwrite(outbuf, 1, out_size, outfile);
- }
- size -= len;
- inbuf_ptr += len;
- }
- }
-
- fclose(outfile);
- fclose(f);
- free(outbuf);
-
- avcodec_close(c);
- free(c);
-}
-
-/*
- * Video encoding example
- */
-void video_encode_example(const char *filename)
-{
- AVCodec *codec;
- AVCodecContext *c= NULL;
- int i, out_size, size, x, y, outbuf_size;
- FILE *f;
- AVFrame *picture;
- uint8_t *outbuf, *picture_buf;
-
- printf("Video encoding\n");
-
- /* find the mpeg1 video encoder */
- codec = avcodec_find_encoder(CODEC_ID_MPEG1VIDEO);
- if (!codec) {
- fprintf(stderr, "codec not found\n");
- exit(1);
- }
-
- 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->height = 288;
- /* frames per second */
- 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) {
- fprintf(stderr, "could not open codec\n");
- exit(1);
- }
-
- /* the codec gives us the frame size, in samples */
-
- f = fopen(filename, "w");
- 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;
-
- /* encode 1 second of video */
- for(i=0;i<25;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;
- }
- }
-
- /* 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;
- }
- }
-
- /* 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);
- }
-
- /* add sequence end code to have a real mpeg file */
- outbuf[0] = 0x00;
- outbuf[1] = 0x00;
- outbuf[2] = 0x01;
- outbuf[3] = 0xb7;
- fwrite(outbuf, 1, 4, f);
- fclose(f);
- free(picture_buf);
- free(outbuf);
-
- avcodec_close(c);
- free(c);
- free(picture);
- printf("\n");
-}
-
-/*
- * Video decoding example
- */
-
-void pgm_save(unsigned char *buf,int wrap, int xsize,int ysize,char *filename)
-{
- 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);
- fclose(f);
-}
-
-void video_decode_example(const char *outfilename, const char *filename)
-{
- AVCodec *codec;
- AVCodecContext *c= NULL;
- int frame, size, got_picture, len;
- FILE *f;
- 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 */
- codec = avcodec_find_decoder(CODEC_ID_MPEG1VIDEO);
- if (!codec) {
- fprintf(stderr, "codec not found\n");
- exit(1);
- }
-
- c= avcodec_alloc_context();
- picture= avcodec_alloc_frame();
-
- if(codec->capabilities&CODEC_CAP_TRUNCATED)
- c->flags|= CODEC_FLAG_TRUNCATED; /* we dont send complete frames */
-
- /* for some codecs, such as msmpeg4 and mpeg4, width and height
- MUST be initialized there because these info are 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");
- if (!f) {
- fprintf(stderr, "could not open %s\n", filename);
- exit(1);
- }
-
- frame = 0;
- for(;;) {
- size = fread(inbuf, 1, INBUF_SIZE, f);
- if (size == 0)
- break;
-
- /* 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.
-
- 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,
- sample rate) to be changed at any frame. We handle this, so
- you should also take care of it */
-
- /* here, we use a stream based decoder (mpeg1video), so we
- feed decoder and see if it could decode a frame */
- inbuf_ptr = inbuf;
- while (size > 0) {
- 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\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],
- c->width, c->height, buf);
- frame++;
- }
- size -= len;
- inbuf_ptr += len;
- }
- }
-
- /* 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,
- NULL, 0);
- if (got_picture) {
- 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],
- c->width, c->height, buf);
- frame++;
- }
-
- fclose(f);
-
- avcodec_close(c);
- free(c);
- 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->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)
-{
- 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 */
- 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");
-
- video_encode_example("/tmp/test.mpg");
- filename = "/tmp/test.mpg";
- } else {
- filename = argv[1];
- }
-
- // audio_decode_example("/tmp/test.sw", filename);
- video_decode_example("/tmp/test%d.pgm", filename);
-#endif
-
- return 0;
-}
projects / synfig.git / blobdiff