FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
api-h264-test.c
Go to the documentation of this file.
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;
36  AVCodecParameters *origin_par = NULL;
37  AVFrame *fr = NULL;
38  uint8_t *byte_buffer = NULL;
39  AVPacket pkt;
41  int number_of_written_bytes;
42  int video_stream;
43  int got_frame = 0;
44  int byte_buffer_size;
45  int i = 0;
46  int result;
47  int end_of_stream = 0;
48 
49  result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL);
50  if (result < 0) {
51  av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
52  return result;
53  }
54 
55  result = avformat_find_stream_info(fmt_ctx, NULL);
56  if (result < 0) {
57  av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
58  return result;
59  }
60 
61  video_stream = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
62  if (video_stream < 0) {
63  av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
64  return -1;
65  }
66 
67  origin_par = fmt_ctx->streams[video_stream]->codecpar;
68 
69  codec = avcodec_find_decoder(origin_par->codec_id);
70  if (!codec) {
71  av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
72  return -1;
73  }
74 
75  ctx = avcodec_alloc_context3(codec);
76  if (!ctx) {
77  av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
78  return AVERROR(ENOMEM);
79  }
80 
81  result = avcodec_parameters_to_context(ctx, origin_par);
82  if (result) {
83  av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
84  return result;
85  }
86 
87  result = avcodec_open2(ctx, codec, NULL);
88  if (result < 0) {
89  av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
90  return result;
91  }
92 
93  fr = av_frame_alloc();
94  if (!fr) {
95  av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
96  return AVERROR(ENOMEM);
97  }
98 
99  byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 16);
100  byte_buffer = av_malloc(byte_buffer_size);
101  if (!byte_buffer) {
102  av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
103  return AVERROR(ENOMEM);
104  }
105 
106  printf("#tb %d: %d/%d\n", video_stream, fmt_ctx->streams[video_stream]->time_base.num, fmt_ctx->streams[video_stream]->time_base.den);
107  i = 0;
108  av_init_packet(&pkt);
109  do {
110  if (!end_of_stream)
111  if (av_read_frame(fmt_ctx, &pkt) < 0)
112  end_of_stream = 1;
113  if (end_of_stream) {
114  pkt.data = NULL;
115  pkt.size = 0;
116  }
117  if (pkt.stream_index == video_stream || end_of_stream) {
118  got_frame = 0;
119  if (pkt.pts == AV_NOPTS_VALUE)
120  pkt.pts = pkt.dts = i;
121  result = avcodec_decode_video2(ctx, fr, &got_frame, &pkt);
122  if (result < 0) {
123  av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");
124  return result;
125  }
126  if (got_frame) {
127  number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,
128  (const uint8_t* const *)fr->data, (const int*) fr->linesize,
129  ctx->pix_fmt, ctx->width, ctx->height, 1);
130  if (number_of_written_bytes < 0) {
131  av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");
132  return number_of_written_bytes;
133  }
134  printf("%d, %10"PRId64", %10"PRId64", %8"PRId64", %8d, 0x%08lx\n", video_stream,
135  fr->pts, fr->pkt_dts, fr->pkt_duration,
136  number_of_written_bytes, av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes));
137  }
138  av_packet_unref(&pkt);
139  av_init_packet(&pkt);
140  }
141  i++;
142  } while (!end_of_stream || got_frame);
143 
144  av_packet_unref(&pkt);
145  av_frame_free(&fr);
146  avcodec_close(ctx);
147  avformat_close_input(&fmt_ctx);
148  avcodec_free_context(&ctx);
149  av_freep(&byte_buffer);
150  return 0;
151 }
152 
153 int main(int argc, char **argv)
154 {
155  if (argc < 2)
156  {
157  av_log(NULL, AV_LOG_ERROR, "Incorrect input\n");
158  return 1;
159  }
160 
161  if (video_decode_example(argv[1]) != 0)
162  return 1;
163 
164  return 0;
165 }
#define NULL
Definition: coverity.c:32
This structure describes decoded (raw) audio or video data.
Definition: frame.h:226
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:453
misc image utilities
static AVFormatContext * fmt_ctx
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3900
int num
Numerator.
Definition: rational.h:59
int size
Definition: avcodec.h:1446
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1743
static AVStream * video_stream
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3424
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3892
Format I/O context.
Definition: avformat.h:1351
uint8_t
#define av_malloc(s)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:189
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
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:319
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
Definition: utils.c:2088
uint8_t * data
Definition: avcodec.h:1445
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:4183
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:1069
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:431
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#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:202
static int video_decode_example(const char *input_filename)
H264 codec test.
Definition: api-h264-test.c:32
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:156
int width
picture width / height.
Definition: avcodec.h:1706
AVFormatContext * ctx
Definition: movenc.c:48
static const char * input_filename
Definition: ffplay.c:311
Public header for Adler-32 hash function implementation.
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:506
attribute_deprecated 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: decode.c:853
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:171
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:257
main external API structure.
Definition: avcodec.h:1533
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:880
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:598
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: utils.c:538
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1768
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:240
int64_t pkt_dts
DTS copied from the AVPacket that triggered returning this frame.
Definition: frame.h:335
Main libavformat public API header.
static int FUNC() end_of_stream(CodedBitstreamContext *ctx, RWContext *rw, H264RawNALUnitHeader *current)
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: utils.c:3564
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:60
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4427
int avformat_open_input(AVFormatContext **ps, const char *url, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:537
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1444
#define av_freep(p)
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1021
int stream_index
Definition: avcodec.h:1447
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:903
This structure stores compressed data.
Definition: avcodec.h:1422
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1438
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248