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api-h264-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  * 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 
32 static int video_decode_example(const char *input_filename)
33 {
34  AVCodec *codec = NULL;
35  AVCodecContext *origin_ctx = NULL, *ctx= NULL;
36  AVFrame *fr = NULL;
37  uint8_t *byte_buffer = NULL;
38  AVPacket pkt;
40  int number_of_written_bytes;
41  int video_stream;
42  int got_frame = 0;
43  int byte_buffer_size;
44  int i = 0;
45  int result;
46  int end_of_stream = 0;
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_ctx = fmt_ctx->streams[video_stream]->codec;
67 
68  codec = avcodec_find_decoder(origin_ctx->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_copy_context(ctx, origin_ctx);
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  byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 16);
99  byte_buffer = av_malloc(byte_buffer_size);
100  if (!byte_buffer) {
101  av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
102  return AVERROR(ENOMEM);
103  }
104 
105  printf("#tb %d: %d/%d\n", video_stream, fmt_ctx->streams[video_stream]->time_base.num, fmt_ctx->streams[video_stream]->time_base.den);
106  i = 0;
107  av_init_packet(&pkt);
108  do {
109  if (!end_of_stream)
110  if (av_read_frame(fmt_ctx, &pkt) < 0)
111  end_of_stream = 1;
112  if (end_of_stream) {
113  pkt.data = NULL;
114  pkt.size = 0;
115  }
116  if (pkt.stream_index == video_stream || end_of_stream) {
117  got_frame = 0;
118  if (pkt.pts == AV_NOPTS_VALUE)
119  pkt.pts = pkt.dts = i;
120  result = avcodec_decode_video2(ctx, fr, &got_frame, &pkt);
121  if (result < 0) {
122  av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");
123  return result;
124  }
125  if (got_frame) {
126  number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,
127  (const uint8_t* const *)fr->data, (const int*) fr->linesize,
128  ctx->pix_fmt, ctx->width, ctx->height, 1);
129  if (number_of_written_bytes < 0) {
130  av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");
131  return number_of_written_bytes;
132  }
133  printf("%d, %10"PRId64", %10"PRId64", %8"PRId64", %8d, 0x%08lx\n", video_stream,
135  number_of_written_bytes, av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes));
136  }
137  av_packet_unref(&pkt);
138  av_init_packet(&pkt);
139  }
140  i++;
141  } while (!end_of_stream || got_frame);
142 
143  av_packet_unref(&pkt);
144  av_frame_free(&fr);
145  avcodec_close(ctx);
146  avformat_close_input(&fmt_ctx);
147  avcodec_free_context(&ctx);
148  av_freep(&byte_buffer);
149  return 0;
150 }
151 
152 int main(int argc, char **argv)
153 {
154  if (argc < 2)
155  {
156  av_log(NULL, AV_LOG_ERROR, "Incorrect input\n");
157  return 1;
158  }
159 
160  av_register_all();
161 
162  if (video_decode_example(argv[1]) != 0)
163  return 1;
164 
165  return 0;
166 }
#define NULL
Definition: coverity.c:32
int64_t av_frame_get_pkt_duration(const AVFrame *frame)
This structure describes decoded (raw) audio or video data.
Definition: frame.h:181
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:383
AVFormatContext * ctx
Definition: movenc-test.c:48
misc image utilities
static AVFormatContext * fmt_ctx
int num
numerator
Definition: rational.h:44
int size
Definition: avcodec.h:1468
static AVStream * video_stream
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3392
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
Copy the settings of the source AVCodecContext into the destination AVCodecContext.
Definition: options.c:182
Format I/O context.
Definition: avformat.h:1314
uint8_t
#define av_malloc(s)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:141
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:44
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1382
uint8_t * data
Definition: avcodec.h:1467
int main(int argc, char **argv)
#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:3613
int avcodec_close(AVCodecContext *avctx)
Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext its...
Definition: utils.c:2529
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:361
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, const AVPacket *avpkt)
Decode the video frame of size avpkt->size from avpkt->data into picture.
Definition: utils.c:2091
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:154
static int video_decode_example(const char *input_filename)
H264 codec test.
Definition: api-h264-test.c:32
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:896
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:149
static const char * input_filename
Definition: ffplay.c:314
Public header for libavutil Adler32 hasher.
Libavcodec external API header.
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:164
enum AVCodecID codec_id
Definition: avcodec.h:1549
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:209
main external API structure.
Definition: avcodec.h:1532
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: utils.c:2629
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:545
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: utils.c:1170
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1509
int64_t pkt_pts
PTS copied from the AVPacket that was decoded to produce this frame.
Definition: frame.h:267
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:192
int64_t pkt_dts
DTS copied from the AVPacket that triggered returning this frame.
Definition: frame.h:274
Main libavformat public API header.
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: utils.c:3139
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
int den
denominator
Definition: rational.h:45
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:3777
int avformat_open_input(AVFormatContext **ps, const char *url, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:422
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1466
#define av_freep(p)
int stream_index
Definition: avcodec.h:1469
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:919
This structure stores compressed data.
Definition: avcodec.h:1444
void av_register_all(void)
Initialize libavformat and register all the muxers, demuxers and protocols.
Definition: allformats.c:51
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1460
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:240