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) {
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 {
104  if (result >= 0 && pkt->stream_index != video_stream) {
106  continue;
107  }
108 
109  if (result < 0)
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  }
117  }
118 
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) {
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  const 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 
204  if (result < 0) {
205  av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
206  return result;
207  }
208 
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
224  if (video_stream < 0) {
225  av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
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");
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 
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 
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) {
279  if (result != 0)
280  break;
281  }
282  }
283 
284 end:
288  av_frame_free(&fr);
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 }
number_of_elements
int number_of_elements
Definition: api-seek-test.c:35
compare_crc_in_array
static int compare_crc_in_array(uint32_t crc, int64_t pts)
Definition: api-seek-test.c:56
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:404
AVCodec
AVCodec.
Definition: codec.h:197
AVHashContext::crc
uint32_t crc
Definition: hash.c:62
AVERROR
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
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:112
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1175
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:396
AVFrame::pkt_duration
int64_t pkt_duration
duration of the corresponding packet, expressed in AVStream->time_base units, 0 if unknown.
Definition: frame.h:565
av_read_frame
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1668
av_packet_free
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:70
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
av_find_best_stream
int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, const AVCodec **decoder_ret, int flags)
Find the "best" stream in the file.
Definition: utils.c:4120
avformat_close_input
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4346
add_crc_to_array
static int add_crc_to_array(uint32_t crc, int64_t pts)
Definition: api-seek-test.c:37
finish
static void finish(void)
Definition: movenc.c:342
AVSEEK_FLAG_ANY
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2169
pts
static int64_t pts
Definition: transcode_aac.c:653
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:99
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
avformat_open_input
int avformat_open_input(AVFormatContext **ps, const char *url, const AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:482
avcodec_alloc_context3
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:141
av_seek_frame
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Seek to the keyframe at timestamp.
Definition: utils.c:2443
read_seek_range
static long int read_seek_range(const char *string_with_number)
Definition: api-seek-test.c:167
crc_array
uint32_t * crc_array
Definition: api-seek-test.c:33
avcodec_receive_frame
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
Definition: decode.c:639
size_of_array
int size_of_array
Definition: api-seek-test.c:34
ctx
AVFormatContext * ctx
Definition: movenc.c:48
AVFormatContext
Format I/O context.
Definition: avformat.h:1107
av_realloc_f
#define av_realloc_f(p, o, n)
Definition: tableprint_vlc.h:33
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:994
result
and forward the result(frame or status change) to the corresponding input. If nothing is possible
NULL
#define NULL
Definition: coverity.c:32
fmt_ctx
static AVFormatContext * fmt_ctx
Definition: demuxing_decoding.c:38
avcodec_free_context
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:156
seek_test
static int seek_test(const char *input_filename, const char *start, const char *end)
Definition: api-seek-test.c:185
adler32.h
avcodec_open2
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: avcodec.c:137
av_adler32_update
AVAdler av_adler32_update(AVAdler adler, const uint8_t *buf, size_t len)
Calculate the Adler32 checksum of a buffer.
Definition: adler32.c:44
avcodec_find_decoder
const AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:915
avformat_find_stream_info
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: utils.c:3546
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
printf
printf("static const uint8_t my_array[100] = {\n")
av_image_get_buffer_size
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
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:59
compute_crc_of_packets
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
avcodec_send_packet
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Definition: decode.c:576
i
int i
Definition: input.c:406
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:366
avcodec_parameters_to_context
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
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:437
avcodec.h
avcodec_flush_buffers
void avcodec_flush_buffers(AVCodecContext *avctx)
Reset the internal codec state / flush internal buffers.
Definition: avcodec.c:380
video_stream
static AVStream * video_stream
Definition: demuxing_decoding.c:42
avformat.h
AVCodecContext
main external API structure.
Definition: avcodec.h:379
AVPacket::stream_index
int stream_index
Definition: packet.h:375
input_filename
static const char * input_filename
Definition: ffplay.c:310
AVERROR_DECODER_NOT_FOUND
#define AVERROR_DECODER_NOT_FOUND
Decoder not found.
Definition: error.h:52
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
av_image_copy_to_buffer
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:501
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
imgutils.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:334
main
int main(int argc, char **argv)
Definition: api-seek-test.c:294
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
pts_array
int64_t * pts_array
Seek test.
Definition: api-seek-test.c:32