FFmpeg
api-seek-test.c
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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  * Seek test.
25  */
26 
27 #include "libavutil/adler32.h"
28 #include "libavcodec/avcodec.h"
29 #include "libavformat/avformat.h"
30 #include "libavutil/imgutils.h"
31 
32 int64_t *pts_array;
33 uint32_t *crc_array;
36 
37 static int add_crc_to_array(uint32_t crc, int64_t pts)
38 {
40  if (size_of_array == 0)
41  size_of_array = 10;
42  size_of_array *= 2;
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);
48  }
49  }
53  return 0;
54 }
55 
56 static int compare_crc_in_array(uint32_t crc, int64_t pts)
57 {
58  int i;
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);
63  return 0;
64  }
65  else {
66  av_log(NULL, AV_LOG_ERROR, "Incorrect crc of a frame after seeking\n");
67  return -1;
68  }
69  }
70  }
71  av_log(NULL, AV_LOG_ERROR, "Incorrect pts of a frame after seeking\n");
72  return -1;
73 }
74 
77  uint64_t ts_start, uint64_t ts_end, int no_seeking)
78 {
79  int number_of_written_bytes;
80  int result;
81  int byte_buffer_size;
82  uint8_t *byte_buffer;
83  uint32_t crc;
84 
85  byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 16);
86  byte_buffer = av_malloc(byte_buffer_size);
87  if (!byte_buffer) {
88  av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
89  return AVERROR(ENOMEM);
90  }
91 
92  if (!no_seeking) {
93  result = av_seek_frame(fmt_ctx, video_stream, ts_start, AVSEEK_FLAG_ANY);
94  printf("Seeking to %"PRId64", computing crc for frames with pts < %"PRId64"\n", ts_start, ts_end);
95  if (result < 0) {
96  av_log(NULL, AV_LOG_ERROR, "Error in seeking\n");
97  return result;
98  }
100  }
101 
102  do {
103  result = av_read_frame(fmt_ctx, pkt);
104  if (result >= 0 && pkt->stream_index != video_stream) {
105  av_packet_unref(pkt);
106  continue;
107  }
108 
109  if (result < 0)
110  result = avcodec_send_packet(ctx, NULL);
111  else {
112  if (pkt->pts == AV_NOPTS_VALUE) {
113  av_log(NULL, AV_LOG_ERROR, "Error: frames doesn't have pts values\n");
114  return -1;
115  }
116  result = avcodec_send_packet(ctx, pkt);
117  }
118 
119  av_packet_unref(pkt);
120 
121  if (result < 0) {
122  av_log(NULL, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
123  return result;
124  }
125 
126  while (result >= 0) {
127  result = avcodec_receive_frame(ctx, fr);
128  if (result == AVERROR_EOF)
129  goto finish;
130  else if (result == AVERROR(EAGAIN)) {
131  result = 0;
132  break;
133  } else if (result < 0) {
134  av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");
135  return result;
136  }
137 
138  number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,
139  (const uint8_t* const *)fr->data, (const int*) fr->linesize,
140  ctx->pix_fmt, ctx->width, ctx->height, 1);
141  if (number_of_written_bytes < 0) {
142  av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");
143  return number_of_written_bytes;
144  }
145  if ((!no_seeking) && (fr->pts > ts_end))
146  break;
147  crc = av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes);
148  printf("%10"PRId64", 0x%08"PRIx32"\n", fr->pts, crc);
149  if (no_seeking) {
150  if (add_crc_to_array(crc, fr->pts) < 0)
151  return -1;
152  }
153  else {
154  if (compare_crc_in_array(crc, fr->pts) < 0)
155  return -1;
156  }
157  av_frame_unref(fr);
158  }
159  } while (result >= 0 && (no_seeking || (fr->pts + fr->pkt_duration <= ts_end)));
160 
161 finish:
162  av_freep(&byte_buffer);
163 
164  return 0;
165 }
166 
167 static long int read_seek_range(const char *string_with_number)
168 {
169  long int number;
170  char *end_of_string = NULL;
171  number = strtol(string_with_number, &end_of_string, 10);
172  if ((strlen(string_with_number) != end_of_string - string_with_number) || (number < 0)) {
173  av_log(NULL, AV_LOG_ERROR, "Incorrect input ranges of seeking\n");
174  return -1;
175  }
176  else if ((number == LONG_MAX) || (number == LONG_MIN)) {
177  if (errno == ERANGE) {
178  av_log(NULL, AV_LOG_ERROR, "Incorrect input ranges of seeking\n");
179  return -1;
180  }
181  }
182  return number;
183 }
184 
185 static int seek_test(const char *input_filename, const char *start, const char *end)
186 {
187  AVCodec *codec = NULL;
189  AVCodecParameters *origin_par = NULL;
190  AVPacket *pkt = NULL;
191  AVFrame *fr = NULL;
193  int video_stream;
194  int result;
195  int i, j;
196  long int start_ts, end_ts;
197 
198  size_of_array = 0;
199  number_of_elements = 0;
200  crc_array = NULL;
201  pts_array = NULL;
202 
203  result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL);
204  if (result < 0) {
205  av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
206  return result;
207  }
208 
209  result = avformat_find_stream_info(fmt_ctx, NULL);
210  if (result < 0) {
211  av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
212  goto end;
213  }
214 
215  start_ts = read_seek_range(start);
216  end_ts = read_seek_range(end);
217  if ((start_ts < 0) || (end_ts < 0)) {
218  result = -1;
219  goto end;
220  }
221 
222  //TODO: add ability to work with audio format
223  video_stream = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
224  if (video_stream < 0) {
225  av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
226  result = video_stream;
227  goto end;
228  }
229 
230  origin_par = fmt_ctx->streams[video_stream]->codecpar;
231 
232  codec = avcodec_find_decoder(origin_par->codec_id);
233  if (!codec) {
234  av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
235  result = AVERROR_DECODER_NOT_FOUND;
236  goto end;
237  }
238 
239  ctx = avcodec_alloc_context3(codec);
240  if (!ctx) {
241  av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
242  result = AVERROR(ENOMEM);
243  goto end;
244  }
245 
246  result = avcodec_parameters_to_context(ctx, origin_par);
247  if (result) {
248  av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
249  goto end;
250  }
251 
252  result = avcodec_open2(ctx, codec, NULL);
253  if (result < 0) {
254  av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
255  goto end;
256  }
257 
258  fr = av_frame_alloc();
259  if (!fr) {
260  av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
261  result = AVERROR(ENOMEM);
262  goto end;
263  }
264 
265  pkt = av_packet_alloc();
266  if (!pkt) {
267  av_log(NULL, AV_LOG_ERROR, "Cannot allocate packet\n");
268  result = AVERROR(ENOMEM);
269  goto end;
270  }
271 
272  result = compute_crc_of_packets(fmt_ctx, video_stream, ctx, pkt, fr, 0, 0, 1);
273  if (result != 0)
274  goto end;
275 
276  for (i = start_ts; i < end_ts; i += 100) {
277  for (j = i + 100; j < end_ts; j += 100) {
278  result = compute_crc_of_packets(fmt_ctx, video_stream, ctx, pkt, fr, i, j, 0);
279  if (result != 0)
280  break;
281  }
282  }
283 
284 end:
287  av_packet_free(&pkt);
288  av_frame_free(&fr);
289  avformat_close_input(&fmt_ctx);
290  avcodec_free_context(&ctx);
291  return result;
292 }
293 
294 int main(int argc, char **argv)
295 {
296  if (argc < 4) {
297  av_log(NULL, AV_LOG_ERROR, "Incorrect input\n");
298  return 1;
299  }
300 
301  if (seek_test(argv[1], argv[2], argv[3]) != 0)
302  return 1;
303 
304  return 0;
305 }
#define NULL
Definition: coverity.c:32
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
#define av_realloc_f(p, o, n)
int av_image_copy_to_buffer(uint8_t *dst, int dst_size, const uint8_t *const src_data[4], const int src_linesize[4], enum AVPixelFormat pix_fmt, int width, int height, int align)
Copy image data from an image into a buffer.
Definition: imgutils.c:505
static int compare_crc_in_array(uint32_t crc, int64_t pts)
Definition: api-seek-test.c:56
misc image utilities
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2432
static AVFormatContext * fmt_ctx
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:746
static AVStream * video_stream
int avformat_open_input(AVFormatContext **ps, const char *url, ff_const59 AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:547
int number_of_elements
Definition: api-seek-test.c:35
AVPacket * pkt
Definition: movenc.c:59
AVCodec.
Definition: codec.h:197
static int add_crc_to_array(uint32_t crc, int64_t pts)
Definition: api-seek-test.c:37
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
Format I/O context.
Definition: avformat.h:1247
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:75
uint8_t
#define av_malloc(s)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:191
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:411
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1315
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
Definition: codec_par.c:147
static void finish(void)
Definition: movenc.c:342
uint32_t crc
Definition: hash.c:62
#define AVERROR_EOF
End of file.
Definition: error.h:55
static int seek_test(const char *input_filename, const char *start, const char *end)
int size_of_array
Definition: api-seek-test.c:34
#define av_log(a,...)
int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, AVCodec **decoder_ret, int flags)
Find the "best" stream in the file.
Definition: utils.c:4275
int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, int width, int height, int align)
Return the size in bytes of the amount of data required to store an image with the given parameters...
Definition: imgutils.c:466
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:204
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
Definition: decode.c:643
static long int read_seek_range(const char *string_with_number)
uint32_t * crc_array
Definition: api-seek-test.c:33
unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf, unsigned int len)
Calculate the Adler32 checksum of a buffer.
Definition: adler32.c:45
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:170
int width
picture width / height.
Definition: avcodec.h:709
AVFormatContext * ctx
Definition: movenc.c:48
static const char * input_filename
Definition: ffplay.c:312
void avcodec_flush_buffers(AVCodecContext *avctx)
Reset the internal codec state / flush internal buffers.
Definition: avcodec.c:444
Public header for Adler-32 hash function implementation.
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Definition: decode.c:580
Libavcodec external API header.
int64_t pkt_duration
duration of the corresponding packet, expressed in AVStream->time_base units, 0 if unknown...
Definition: frame.h:597
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer...
Definition: options.c:185
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
main external API structure.
Definition: avcodec.h:536
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:634
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: avcodec.c:142
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1772
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:946
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:554
static int64_t pts
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Seek to the keyframe at timestamp.
Definition: utils.c:2547
Main libavformat public API header.
int64_t * pts_array
Seek test.
Definition: api-seek-test.c:32
static int compute_crc_of_packets(AVFormatContext *fmt_ctx, int video_stream, AVCodecContext *ctx, AVPacket *pkt, AVFrame *fr, uint64_t ts_start, uint64_t ts_end, int no_seeking)
Definition: api-seek-test.c:75
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: utils.c:3650
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4525
#define AVERROR_DECODER_NOT_FOUND
Decoder not found.
Definition: error.h:52
int main(int argc, char **argv)
printf("static const uint8_t my_array[100] = {\n")
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:64
and forward the result(frame or status change) to the corresponding input.If nothing is possible
#define av_freep(p)
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1049
int stream_index
Definition: packet.h:371
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
This structure stores compressed data.
Definition: packet.h:346
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
int i
Definition: input.c:407
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248