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"
35 int number_of_elements;
37 static int add_crc_to_array(uint32_t crc, int64_t pts)
39 if (size_of_array <= number_of_elements) {
40 if (size_of_array == 0)
43 crc_array = av_realloc_f(crc_array, size_of_array, sizeof(uint32_t));
44 pts_array = av_realloc_f(pts_array, size_of_array, sizeof(int64_t));
45 if ((crc_array == NULL) || (pts_array == NULL)) {
46 av_log(NULL, AV_LOG_ERROR, "Can't allocate array to store crcs\n");
47 return AVERROR(ENOMEM);
50 crc_array[number_of_elements] = crc;
51 pts_array[number_of_elements] = pts;
56 static int compare_crc_in_array(uint32_t crc, int64_t pts)
59 for (i = 0; i < number_of_elements; i++) {
60 if (pts_array[i] == pts) {
61 if (crc_array[i] == crc) {
62 printf("Comparing 0x%08"PRIx32" %"PRId64" %d is OK\n", crc, pts, i);
66 av_log(NULL, AV_LOG_ERROR, "Incorrect crc of a frame after seeking\n");
71 av_log(NULL, AV_LOG_ERROR, "Incorrect pts of a frame after seeking\n");
75 static int compute_crc_of_packets(AVFormatContext *fmt_ctx, int video_stream,
76 AVCodecContext *ctx, AVFrame *fr, uint64_t ts_start, uint64_t ts_end, int no_seeking)
78 int number_of_written_bytes;
81 int end_of_stream = 0;
87 byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 16);
88 byte_buffer = av_malloc(byte_buffer_size);
90 av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
91 return AVERROR(ENOMEM);
95 result = av_seek_frame(fmt_ctx, video_stream, ts_start, AVSEEK_FLAG_ANY);
96 printf("Seeking to %"PRId64", computing crc for frames with pts < %"PRId64"\n", ts_start, ts_end);
98 av_log(NULL, AV_LOG_ERROR, "Error in seeking\n");
101 avcodec_flush_buffers(ctx);
104 av_init_packet(&pkt);
107 if (av_read_frame(fmt_ctx, &pkt) < 0)
113 if (pkt.stream_index == video_stream || end_of_stream) {
115 if ((pkt.pts == AV_NOPTS_VALUE) && (!end_of_stream)) {
116 av_log(NULL, AV_LOG_ERROR, "Error: frames doesn't have pts values\n");
119 result = avcodec_decode_video2(ctx, fr, &got_frame, &pkt);
121 av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");
125 number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,
126 (const uint8_t* const *)fr->data, (const int*) fr->linesize,
127 ctx->pix_fmt, ctx->width, ctx->height, 1);
128 if (number_of_written_bytes < 0) {
129 av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");
130 return number_of_written_bytes;
132 if ((!no_seeking) && (fr->pts > ts_end))
134 crc = av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes);
135 printf("%10"PRId64", 0x%08"PRIx32"\n", fr->pts, crc);
137 if (add_crc_to_array(crc, fr->pts) < 0)
141 if (compare_crc_in_array(crc, fr->pts) < 0)
146 av_packet_unref(&pkt);
147 av_init_packet(&pkt);
148 } while ((!end_of_stream || got_frame) && (no_seeking || (fr->pts + av_frame_get_pkt_duration(fr) <= ts_end)));
150 av_packet_unref(&pkt);
151 av_freep(&byte_buffer);
156 static long int read_seek_range(const char *string_with_number)
159 char *end_of_string = NULL;
160 number = strtol(string_with_number, &end_of_string, 10);
161 if ((strlen(string_with_number) != end_of_string - string_with_number) || (number < 0)) {
162 av_log(NULL, AV_LOG_ERROR, "Incorrect input ranges of seeking\n");
165 else if ((number == LONG_MAX) || (number == LONG_MIN)) {
166 if (errno == ERANGE) {
167 av_log(NULL, AV_LOG_ERROR, "Incorrect input ranges of seeking\n");
174 static int seek_test(const char *input_filename, const char *start, const char *end)
176 AVCodec *codec = NULL;
177 AVCodecContext *ctx= NULL;
178 AVCodecParameters *origin_par = NULL;
180 AVFormatContext *fmt_ctx = NULL;
184 long int start_ts, end_ts;
187 number_of_elements = 0;
191 result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL);
193 av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
197 result = avformat_find_stream_info(fmt_ctx, NULL);
199 av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
203 start_ts = read_seek_range(start);
204 end_ts = read_seek_range(end);
205 if ((start_ts < 0) || (end_ts < 0)) {
210 //TODO: add ability to work with audio format
211 video_stream = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
212 if (video_stream < 0) {
213 av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
214 result = video_stream;
218 origin_par = fmt_ctx->streams[video_stream]->codecpar;
220 codec = avcodec_find_decoder(origin_par->codec_id);
222 av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
223 result = AVERROR_DECODER_NOT_FOUND;
227 ctx = avcodec_alloc_context3(codec);
229 av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
230 result = AVERROR(ENOMEM);
234 result = avcodec_parameters_to_context(ctx, origin_par);
236 av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
240 result = avcodec_open2(ctx, codec, NULL);
242 av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
246 fr = av_frame_alloc();
248 av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
249 result = AVERROR(ENOMEM);
253 result = compute_crc_of_packets(fmt_ctx, video_stream, ctx, fr, 0, 0, 1);
257 for (i = start_ts; i < end_ts; i += 100) {
258 for (j = i + 100; j < end_ts; j += 100) {
259 result = compute_crc_of_packets(fmt_ctx, video_stream, ctx, fr, i, j, 0);
266 av_freep(&crc_array);
267 av_freep(&pts_array);
270 avformat_close_input(&fmt_ctx);
271 avcodec_free_context(&ctx);
275 int main(int argc, char **argv)
278 av_log(NULL, AV_LOG_ERROR, "Incorrect input\n");
284 if (seek_test(argv[1], argv[2], argv[3]) != 0)