1 /*
2 * Copyright (c) 2015 Ludmila Glinskih
3 *
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:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
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
20 * THE SOFTWARE.
21 */
22
23 /**
24 * H264 codec test.
25 */
26
27 #include "libavutil/adler32.h"
28 #include "libavcodec/avcodec.h"
29 #include "libavformat/avformat.h"
30 #include "libavutil/imgutils.h"
31 #include "libavutil/timestamp.h"
32
video_decode_example(const char * input_filename)33 static int video_decode_example(const char *input_filename)
34 {
35 AVCodec *codec = NULL;
36 AVCodecContext *ctx= NULL;
37 AVCodecParameters *origin_par = NULL;
38 AVFrame *fr = NULL;
39 uint8_t *byte_buffer = NULL;
40 AVPacket pkt;
41 AVFormatContext *fmt_ctx = NULL;
42 int number_of_written_bytes;
43 int video_stream;
44 int got_frame = 0;
45 int byte_buffer_size;
46 int i = 0;
47 int result;
48 int end_of_stream = 0;
49
50 result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL);
51 if (result < 0) {
52 av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
53 return result;
54 }
55
56 result = avformat_find_stream_info(fmt_ctx, NULL);
57 if (result < 0) {
58 av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
59 return result;
60 }
61
62 video_stream = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
63 if (video_stream < 0) {
64 av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
65 return -1;
66 }
67
68 origin_par = fmt_ctx->streams[video_stream]->codecpar;
69
70 codec = avcodec_find_decoder(origin_par->codec_id);
71 if (!codec) {
72 av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
73 return -1;
74 }
75
76 ctx = avcodec_alloc_context3(codec);
77 if (!ctx) {
78 av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
79 return AVERROR(ENOMEM);
80 }
81
82 result = avcodec_parameters_to_context(ctx, origin_par);
83 if (result) {
84 av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
85 return result;
86 }
87
88 result = avcodec_open2(ctx, codec, NULL);
89 if (result < 0) {
90 av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
91 return result;
92 }
93
94 fr = av_frame_alloc();
95 if (!fr) {
96 av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
97 return AVERROR(ENOMEM);
98 }
99
100 byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 16);
101 byte_buffer = av_malloc(byte_buffer_size);
102 if (!byte_buffer) {
103 av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
104 return AVERROR(ENOMEM);
105 }
106
107 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 i = 0;
109 av_init_packet(&pkt);
110 do {
111 if (!end_of_stream)
112 if (av_read_frame(fmt_ctx, &pkt) < 0)
113 end_of_stream = 1;
114 if (end_of_stream) {
115 pkt.data = NULL;
116 pkt.size = 0;
117 }
118 if (pkt.stream_index == video_stream || end_of_stream) {
119 got_frame = 0;
120 if (pkt.pts == AV_NOPTS_VALUE)
121 pkt.pts = pkt.dts = i;
122 result = avcodec_decode_video2(ctx, fr, &got_frame, &pkt);
123 if (result < 0) {
124 av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");
125 return result;
126 }
127 if (got_frame) {
128 number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,
129 (const uint8_t* const *)fr->data, (const int*) fr->linesize,
130 ctx->pix_fmt, ctx->width, ctx->height, 1);
131 if (number_of_written_bytes < 0) {
132 av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");
133 return number_of_written_bytes;
134 }
135 printf("%d, %s, %s, %8"PRId64", %8d, 0x%08lx\n", video_stream,
136 av_ts2str(fr->pts), av_ts2str(fr->pkt_dts), fr->pkt_duration,
137 number_of_written_bytes, av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes));
138 }
139 av_packet_unref(&pkt);
140 av_init_packet(&pkt);
141 }
142 i++;
143 } while (!end_of_stream || got_frame);
144
145 av_packet_unref(&pkt);
146 av_frame_free(&fr);
147 avcodec_close(ctx);
148 avformat_close_input(&fmt_ctx);
149 avcodec_free_context(&ctx);
150 av_freep(&byte_buffer);
151 return 0;
152 }
153
main(int argc,char ** argv)154 int main(int argc, char **argv)
155 {
156 if (argc < 2)
157 {
158 av_log(NULL, AV_LOG_ERROR, "Incorrect input\n");
159 return 1;
160 }
161
162 if (video_decode_example(argv[1]) != 0)
163 return 1;
164
165 return 0;
166 }
167