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 const 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 byte_buffer_size;
45 int i = 0;
46 int result;
47
48 result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL);
49 if (result < 0) {
50 av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
51 return result;
52 }
53
54 result = avformat_find_stream_info(fmt_ctx, NULL);
55 if (result < 0) {
56 av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
57 return result;
58 }
59
60 video_stream = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
61 if (video_stream < 0) {
62 av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
63 return -1;
64 }
65
66 origin_par = fmt_ctx->streams[video_stream]->codecpar;
67
68 codec = avcodec_find_decoder(origin_par->codec_id);
69 if (!codec) {
70 av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
71 return -1;
72 }
73
74 ctx = avcodec_alloc_context3(codec);
75 if (!ctx) {
76 av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
77 return AVERROR(ENOMEM);
78 }
79
80 result = avcodec_parameters_to_context(ctx, origin_par);
81 if (result) {
82 av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
83 return result;
84 }
85
86 result = avcodec_open2(ctx, codec, NULL);
87 if (result < 0) {
88 av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
89 return result;
90 }
91
92 fr = av_frame_alloc();
93 if (!fr) {
94 av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
95 return AVERROR(ENOMEM);
96 }
97
98 pkt = av_packet_alloc();
99 if (!pkt) {
100 av_log(NULL, AV_LOG_ERROR, "Cannot allocate packet\n");
101 return AVERROR(ENOMEM);
102 }
103
104 byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 16);
105 byte_buffer = av_malloc(byte_buffer_size);
106 if (!byte_buffer) {
107 av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
108 return AVERROR(ENOMEM);
109 }
110
111 printf("#tb %d: %d/%d\n", video_stream, fmt_ctx->streams[video_stream]->time_base.num, fmt_ctx->streams[video_stream]->time_base.den);
112 i = 0;
113
114 result = 0;
115 while (result >= 0) {
116 result = av_read_frame(fmt_ctx, pkt);
117 if (result >= 0 && pkt->stream_index != video_stream) {
118 av_packet_unref(pkt);
119 continue;
120 }
121
122 if (result < 0)
123 result = avcodec_send_packet(ctx, NULL);
124 else {
125 if (pkt->pts == AV_NOPTS_VALUE)
126 pkt->pts = pkt->dts = i;
127 result = avcodec_send_packet(ctx, pkt);
128 }
129 av_packet_unref(pkt);
130
131 if (result < 0) {
132 av_log(NULL, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
133 return result;
134 }
135
136 while (result >= 0) {
137 result = avcodec_receive_frame(ctx, fr);
138 if (result == AVERROR_EOF)
139 goto finish;
140 else if (result == AVERROR(EAGAIN)) {
141 result = 0;
142 break;
143 } else if (result < 0) {
144 av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");
145 return result;
146 }
147
148 number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,
149 (const uint8_t* const *)fr->data, (const int*) fr->linesize,
150 ctx->pix_fmt, ctx->width, ctx->height, 1);
151 if (number_of_written_bytes < 0) {
152 av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");
153 av_frame_unref(fr);
154 return number_of_written_bytes;
155 }
156 printf("%d, %s, %s, %8"PRId64", %8d, 0x%08"PRIx32"\n", video_stream,
157 av_ts2str(fr->pts), av_ts2str(fr->pkt_dts), fr->pkt_duration,
158 number_of_written_bytes, av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes));
159
160 av_frame_unref(fr);
161 }
162 i++;
163 }
164
165 finish:
166 av_packet_free(&pkt);
167 av_frame_free(&fr);
168 avformat_close_input(&fmt_ctx);
169 avcodec_free_context(&ctx);
170 av_freep(&byte_buffer);
171 return 0;
172 }
173
main(int argc,char ** argv)174 int main(int argc, char **argv)
175 {
176 if (argc < 2)
177 {
178 av_log(NULL, AV_LOG_ERROR, "Incorrect input\n");
179 return 1;
180 }
181
182 if (video_decode_example(argv[1]) != 0)
183 return 1;
184
185 return 0;
186 }
187