2 * Copyright (c) 2015 Ludmila Glinskih
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
27 #include "libavutil/adler32.h"
28 #include "libavcodec/avcodec.h"
29 #include "libavformat/avformat.h"
30 #include "libavutil/imgutils.h"
32 static int video_decode_example(const char *input_filename)
34 AVCodec *codec = NULL;
35 AVCodecContext *ctx= NULL;
36 AVCodecParameters *origin_par = NULL;
38 uint8_t *byte_buffer = NULL;
40 AVFormatContext *fmt_ctx = NULL;
41 int number_of_written_bytes;
47 int end_of_stream = 0;
49 result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL);
51 av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
55 result = avformat_find_stream_info(fmt_ctx, NULL);
57 av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
61 video_stream = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
62 if (video_stream < 0) {
63 av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
67 origin_par = fmt_ctx->streams[video_stream]->codecpar;
69 codec = avcodec_find_decoder(origin_par->codec_id);
71 av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
75 ctx = avcodec_alloc_context3(codec);
77 av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
78 return AVERROR(ENOMEM);
81 result = avcodec_parameters_to_context(ctx, origin_par);
83 av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
87 result = avcodec_open2(ctx, codec, NULL);
89 av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
93 fr = av_frame_alloc();
95 av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
96 return AVERROR(ENOMEM);
99 byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 16);
100 byte_buffer = av_malloc(byte_buffer_size);
102 av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
103 return AVERROR(ENOMEM);
106 printf("#tb %d: %d/%d\n", video_stream, fmt_ctx->streams[video_stream]->time_base.num, fmt_ctx->streams[video_stream]->time_base.den);
108 av_init_packet(&pkt);
111 if (av_read_frame(fmt_ctx, &pkt) < 0)
117 if (pkt.stream_index == video_stream || end_of_stream) {
119 if (pkt.pts == AV_NOPTS_VALUE)
120 pkt.pts = pkt.dts = i;
121 result = avcodec_decode_video2(ctx, fr, &got_frame, &pkt);
123 av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");
127 number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,
128 (const uint8_t* const *)fr->data, (const int*) fr->linesize,
129 ctx->pix_fmt, ctx->width, ctx->height, 1);
130 if (number_of_written_bytes < 0) {
131 av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");
132 return number_of_written_bytes;
134 printf("%d, %10"PRId64", %10"PRId64", %8"PRId64", %8d, 0x%08lx\n", video_stream,
135 fr->pts, fr->pkt_dts, fr->pkt_duration,
136 number_of_written_bytes, av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes));
138 av_packet_unref(&pkt);
139 av_init_packet(&pkt);
142 } while (!end_of_stream || got_frame);
144 av_packet_unref(&pkt);
147 avformat_close_input(&fmt_ctx);
148 avcodec_free_context(&ctx);
149 av_freep(&byte_buffer);
153 int main(int argc, char **argv)
157 av_log(NULL, AV_LOG_ERROR, "Incorrect input\n");
163 if (video_decode_example(argv[1]) != 0)