FFmpeg
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 #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  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:308
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
misc image utilities
static AVFormatContext * fmt_ctx
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int num
Numerator.
Definition: rational.h:59
int size
Definition: packet.h:364
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
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:500
static AVPacket pkt
AVCodec.
Definition: codec.h:190
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
Format I/O context.
Definition: avformat.h:1355
uint8_t
#define av_malloc(s)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
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:401
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1423
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:2166
uint8_t * data
Definition: packet.h:363
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:4174
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:203
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:172
int width
picture width / height.
Definition: avcodec.h:699
AVFormatContext * ctx
Definition: movenc.c:48
static const char * input_filename
Definition: ffplay.c:312
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:587
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:826
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:187
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:339
main external API structure.
Definition: avcodec.h:526
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:606
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: utils.c:550
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1710
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:937
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:322
int64_t pkt_dts
DTS copied from the AVPacket that triggered returning this frame.
Definition: frame.h:417
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:3545
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:35
int den
Denominator.
Definition: rational.h:60
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4421
#define av_ts2str(ts)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: timestamp.h:54
printf("static const uint8_t my_array[100] = {\n")
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: packet.h:362
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:1027
int stream_index
Definition: packet.h:365
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:909
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:340
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:356
int i
Definition: input.c:407
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248