FFmpeg  4.2.2
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
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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 #include "libavutil/timestamp.h"
32 
33 static int video_decode_example(const char *input_filename)
34 {
35  AVCodec *codec = NULL;
37  AVCodecParameters *origin_par = NULL;
38  AVFrame *fr = NULL;
39  uint8_t *byte_buffer = NULL;
40  AVPacket pkt;
42  int number_of_written_bytes;
43  int video_stream;
44  int got_frame = 0;
45  int byte_buffer_size;
46  int i = 0;
47  int result;
48  int end_of_stream = 0;
49 
50  result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL);
51  if (result < 0) {
52  av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
53  return result;
54  }
55 
56  result = avformat_find_stream_info(fmt_ctx, NULL);
57  if (result < 0) {
58  av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
59  return result;
60  }
61 
62  video_stream = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
63  if (video_stream < 0) {
64  av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
65  return -1;
66  }
67 
68  origin_par = fmt_ctx->streams[video_stream]->codecpar;
69 
70  codec = avcodec_find_decoder(origin_par->codec_id);
71  if (!codec) {
72  av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
73  return -1;
74  }
75 
76  ctx = avcodec_alloc_context3(codec);
77  if (!ctx) {
78  av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
79  return AVERROR(ENOMEM);
80  }
81 
82  result = avcodec_parameters_to_context(ctx, origin_par);
83  if (result) {
84  av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
85  return result;
86  }
87 
88  result = avcodec_open2(ctx, codec, NULL);
89  if (result < 0) {
90  av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
91  return result;
92  }
93 
94  fr = av_frame_alloc();
95  if (!fr) {
96  av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
97  return AVERROR(ENOMEM);
98  }
99 
100  byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 16);
101  byte_buffer = av_malloc(byte_buffer_size);
102  if (!byte_buffer) {
103  av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
104  return AVERROR(ENOMEM);
105  }
106 
107  printf("#tb %d: %d/%d\n", video_stream, fmt_ctx->streams[video_stream]->time_base.num, fmt_ctx->streams[video_stream]->time_base.den);
108  i = 0;
109  av_init_packet(&pkt);
110  do {
111  if (!end_of_stream)
112  if (av_read_frame(fmt_ctx, &pkt) < 0)
113  end_of_stream = 1;
114  if (end_of_stream) {
115  pkt.data = NULL;
116  pkt.size = 0;
117  }
118  if (pkt.stream_index == video_stream || end_of_stream) {
119  got_frame = 0;
120  if (pkt.pts == AV_NOPTS_VALUE)
121  pkt.pts = pkt.dts = i;
122  result = avcodec_decode_video2(ctx, fr, &got_frame, &pkt);
123  if (result < 0) {
124  av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");
125  return result;
126  }
127  if (got_frame) {
128  number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,
129  (const uint8_t* const *)fr->data, (const int*) fr->linesize,
130  ctx->pix_fmt, ctx->width, ctx->height, 1);
131  if (number_of_written_bytes < 0) {
132  av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");
133  return number_of_written_bytes;
134  }
135  printf("%d, %s, %s, %8"PRId64", %8d, 0x%08lx\n", video_stream,
136  av_ts2str(fr->pts), av_ts2str(fr->pkt_dts), fr->pkt_duration,
137  number_of_written_bytes, av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes));
138  }
139  av_packet_unref(&pkt);
140  av_init_packet(&pkt);
141  }
142  i++;
143  } while (!end_of_stream || got_frame);
144 
145  av_packet_unref(&pkt);
146  av_frame_free(&fr);
147  avcodec_close(ctx);
148  avformat_close_input(&fmt_ctx);
149  avcodec_free_context(&ctx);
150  av_freep(&byte_buffer);
151  return 0;
152 }
153 
154 int main(int argc, char **argv)
155 {
156  if (argc < 2)
157  {
158  av_log(NULL, AV_LOG_ERROR, "Incorrect input\n");
159  return 1;
160  }
161 
162  if (video_decode_example(argv[1]) != 0)
163  return 1;
164 
165  return 0;
166 }
#define NULL
Definition: coverity.c:32
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
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:3957
int num
Numerator.
Definition: rational.h:59
int size
Definition: avcodec.h:1478
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1775
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:537
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3481
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3949
Format I/O context.
Definition: avformat.h:1358
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
timestamp utils, mostly useful for debugging/logging purposes
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:388
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
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:2115
uint8_t * data
Definition: avcodec.h:1477
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:4186
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:1100
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 i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#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:33
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:1738
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:574
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:898
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:326
main external API structure.
Definition: avcodec.h:1565
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:890
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: utils.c:548
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:309
int64_t pkt_dts
DTS copied from the AVPacket that triggered returning this frame.
Definition: frame.h:404
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:3567
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:4431
#define av_ts2str(ts)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: timestamp.h:54
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1476
#define av_freep(p)
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int stream_index
Definition: avcodec.h:1479
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:910
This structure stores compressed data.
Definition: avcodec.h:1454
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1470
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248