/*
- * copyright (c) 2001 Fabrice Bellard
+ * Copyright (c) 2001 Fabrice Bellard
*
- * This file is part of Libav.
+ * 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:
*
- * Libav 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.
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
*
- * Libav 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 Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * 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.
*/
/**
#include <stdlib.h>
#include <string.h>
-#include "libavcodec/avcodec.h"
-
-#include "libavutil/common.h"
-#include "libavutil/imgutils.h"
-#include "libavutil/mathematics.h"
+#include <libavcodec/avcodec.h>
#define INBUF_SIZE 4096
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);
+ 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 int decode_write_frame(const char *outfilename, AVCodecContext *avctx,
+ AVFrame *frame, int *frame_count, AVPacket *pkt, int last)
+{
+ int len, got_frame;
+ char buf[1024];
+
+ len = avcodec_decode_video2(avctx, frame, &got_frame, pkt);
+ if (len < 0) {
+ fprintf(stderr, "Error while decoding frame %d\n", *frame_count);
+ return len;
+ }
+ if (got_frame) {
+ printf("Saving %sframe %3d\n", last ? "last " : "", *frame_count);
+ fflush(stdout);
+
+ /* the picture is allocated by the decoder, no need to free it */
+ snprintf(buf, sizeof(buf), outfilename, *frame_count);
+ pgm_save(frame->data[0], frame->linesize[0],
+ frame->width, frame->height, buf);
+ (*frame_count)++;
+ }
+ if (pkt->data) {
+ pkt->size -= len;
+ pkt->data += len;
+ }
+ return 0;
+}
+
int main(int argc, char **argv)
{
const char *filename, *outfilename;
- AVCodec *codec;
+ const AVCodec *codec;
AVCodecContext *c= NULL;
- int frame, got_picture, len;
+ int frame_count;
FILE *f;
- AVFrame *picture;
+ AVFrame *frame;
uint8_t inbuf[INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
- char buf[1024];
AVPacket avpkt;
if (argc <= 2) {
/* find the MPEG-1 video decoder */
codec = avcodec_find_decoder(AV_CODEC_ID_MPEG1VIDEO);
if (!codec) {
- fprintf(stderr, "codec not found\n");
+ fprintf(stderr, "Codec not found\n");
exit(1);
}
c = avcodec_alloc_context3(codec);
- picture = av_frame_alloc();
+ if (!c) {
+ fprintf(stderr, "Could not allocate video codec context\n");
+ exit(1);
+ }
if (codec->capabilities & AV_CODEC_CAP_TRUNCATED)
c->flags |= AV_CODEC_FLAG_TRUNCATED; // we do not send complete frames
/* open it */
if (avcodec_open2(c, codec, NULL) < 0) {
- fprintf(stderr, "could not open codec\n");
+ 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);
+ fprintf(stderr, "Could not open %s\n", filename);
exit(1);
}
- frame = 0;
- for(;;) {
+ frame = av_frame_alloc();
+ if (!frame) {
+ fprintf(stderr, "Could not allocate video frame\n");
+ exit(1);
+ }
+
+ frame_count = 0;
+ for (;;) {
avpkt.size = fread(inbuf, 1, INBUF_SIZE, f);
if (avpkt.size == 0)
break;
/* 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);
+ while (avpkt.size > 0)
+ if (decode_write_frame(outfilename, c, frame, &frame_count, &avpkt, 0) < 0)
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
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++;
- }
+ decode_write_frame(outfilename, c, frame, &frame_count, &avpkt, 1);
fclose(f);
avcodec_free_context(&c);
- av_frame_free(&picture);
+ av_frame_free(&frame);
return 0;
}
projects / ffmpeg.git / commitdiff