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- /*
- * Copyright (c) 2001 Fabrice Bellard
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
- /**
- * @file
- * libavcodec API use example.
- *
- * Note that libavcodec only handles codecs (mpeg, mpeg4, etc...),
- * not file formats (avi, vob, etc...). See library 'libavformat' for the
- * format handling
- */
- #include "libavcodec/avcodec.h"
- #include "libavutil/mathematics.h"
- #define INBUF_SIZE 4096
- #define AUDIO_INBUF_SIZE 20480
- #define AUDIO_REFILL_THRESH 4096
- /*
- * Audio encoding example
- */
- static 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_context3(codec);
- /* put sample parameters */
- c->bit_rate = 64000;
- c->sample_rate = 44100;
- c->channels = 2;
- c->sample_fmt = AV_SAMPLE_FMT_S16;
- /* 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, "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;
- 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);
- av_free(c);
- }
- /*
- * Audio decoding.
- */
- static void audio_decode_example(const char *outfilename, const char *filename)
- {
- AVCodec *codec;
- AVCodecContext *c= NULL;
- int out_size, len;
- FILE *f, *outfile;
- uint8_t *outbuf;
- uint8_t inbuf[AUDIO_INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
- AVPacket avpkt;
- av_init_packet(&avpkt);
- printf("Audio decoding\n");
- /* 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_context3(codec);
- /* 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, "rb");
- if (!f) {
- fprintf(stderr, "could not open %s\n", filename);
- exit(1);
- }
- outfile = fopen(outfilename, "wb");
- if (!outfile) {
- av_free(c);
- exit(1);
- }
- /* decode until eof */
- avpkt.data = inbuf;
- avpkt.size = fread(inbuf, 1, AUDIO_INBUF_SIZE, f);
- while (avpkt.size > 0) {
- out_size = AVCODEC_MAX_AUDIO_FRAME_SIZE;
- len = avcodec_decode_audio3(c, (short *)outbuf, &out_size, &avpkt);
- 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);
- }
- avpkt.size -= len;
- avpkt.data += len;
- if (avpkt.size < AUDIO_REFILL_THRESH) {
- /* Refill the input buffer, to avoid trying to decode
- * incomplete frames. Instead of this, one could also use
- * a parser, or use a proper container format through
- * libavformat. */
- memmove(inbuf, avpkt.data, avpkt.size);
- avpkt.data = inbuf;
- len = fread(avpkt.data + avpkt.size, 1,
- AUDIO_INBUF_SIZE - avpkt.size, f);
- if (len > 0)
- avpkt.size += len;
- }
- }
- fclose(outfile);
- fclose(f);
- free(outbuf);
- avcodec_close(c);
- av_free(c);
- }
- /*
- * Video encoding example
- */
- static 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;
- 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_context3(codec);
- 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->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);
- }
- 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);
- /* the image can be allocated by any means and av_image_alloc() is
- * just the most convenient way if av_malloc() is to be used */
- av_image_alloc(picture->data, picture->linesize,
- c->width, c->height, c->pix_fmt, 1);
- /* 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(outbuf);
- avcodec_close(c);
- av_free(c);
- av_free(picture->data[0]);
- av_free(picture);
- printf("\n");
- }
- /*
- * Video decoding example
- */
- static 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);
- }
- static void video_decode_example(const char *outfilename, const char *filename)
- {
- AVCodec *codec;
- AVCodecContext *c= NULL;
- int frame, got_picture, len;
- FILE *f;
- AVFrame *picture;
- uint8_t inbuf[INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
- char buf[1024];
- AVPacket avpkt;
- 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, 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_context3(codec);
- picture= avcodec_alloc_frame();
- 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, "rb");
- if (!f) {
- fprintf(stderr, "could not open %s\n", filename);
- exit(1);
- }
- frame = 0;
- for(;;) {
- avpkt.size = fread(inbuf, 1, INBUF_SIZE, f);
- if (avpkt.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 */
- avpkt.data = inbuf;
- while (avpkt.size > 0) {
- len = avcodec_decode_video2(c, picture, &got_picture, &avpkt);
- 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++;
- }
- avpkt.size -= len;
- avpkt.data += 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 */
- avpkt.data = NULL;
- avpkt.size = 0;
- len = avcodec_decode_video2(c, picture, &got_picture, &avpkt);
- 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);
- 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 */
- avcodec_register_all();
- 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);
- return 0;
- }
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