FFmpeg
api-band-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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19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20  * THE SOFTWARE.
21  */
22 
23 /**
24  * draw_horiz_band test.
25  */
26 
27 #include "libavutil/adler32.h"
28 #include "libavcodec/avcodec.h"
29 #include "libavformat/avformat.h"
30 #include "libavutil/imgutils.h"
31 
35 
36 static void draw_horiz_band(AVCodecContext *ctx, const AVFrame *fr, int offset[4],
37  int slice_position, int type, int height)
38 {
39  int i;
40  const AVPixFmtDescriptor *pix_fmt_desc;
41  int chroma_w, chroma_h;
42  int shift_slice_position;
43  int shift_height;
44 
46 
47  pix_fmt_desc = av_pix_fmt_desc_get(ctx->pix_fmt);
48  chroma_w = -((-ctx->width) >> pix_fmt_desc->log2_chroma_w);
49  chroma_h = -((-height) >> pix_fmt_desc->log2_chroma_h);
50  shift_slice_position = -((-slice_position) >> pix_fmt_desc->log2_chroma_h);
51  shift_height = -((-ctx->height) >> pix_fmt_desc->log2_chroma_h);
52 
53  for (i = 0; i < height; i++) {
54  memcpy(slice_byte_buffer + ctx->width * slice_position + i * ctx->width,
55  fr->data[0] + offset[0] + i * fr->linesize[0], ctx->width);
56  }
57  for (i = 0; i < chroma_h; i++) {
58  memcpy(slice_byte_buffer + ctx->width * ctx->height + chroma_w * shift_slice_position + i * chroma_w,
59  fr->data[1] + offset[1] + i * fr->linesize[1], chroma_w);
60  }
61  for (i = 0; i < chroma_h; i++) {
62  memcpy(slice_byte_buffer + ctx->width * ctx->height + chroma_w * shift_height + chroma_w * shift_slice_position + i * chroma_w,
63  fr->data[2] + offset[2] + i * fr->linesize[2], chroma_w);
64  }
65 }
66 
67 static int video_decode(const char *input_filename)
68 {
69  AVCodec *codec = NULL;
71  AVCodecParameters *origin_par = NULL;
72  uint8_t *byte_buffer = NULL;
73  AVFrame *fr = NULL;
74  AVPacket pkt;
76  int number_of_written_bytes;
77  int video_stream;
78  int got_frame = 0;
79  int byte_buffer_size;
80  int result;
81  int end_of_stream = 0;
82 
84 
85  result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL);
86  if (result < 0) {
87  av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
88  return result;
89  }
90 
91  result = avformat_find_stream_info(fmt_ctx, NULL);
92  if (result < 0) {
93  av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
94  return result;
95  }
96 
97  video_stream = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
98  if (video_stream < 0) {
99  av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
100  return -1;
101  }
102 
103  origin_par = fmt_ctx->streams[video_stream]->codecpar;
104 
105  codec = avcodec_find_decoder(origin_par->codec_id);
106  if (!codec) {
107  av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
108  return -1;
109  }
110 
111  ctx = avcodec_alloc_context3(codec);
112  if (!ctx) {
113  av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
114  return AVERROR(ENOMEM);
115  }
116 
117  result = avcodec_parameters_to_context(ctx, origin_par);
118  if (result) {
119  av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
120  return result;
121  }
122 
124  ctx->thread_count = 1;
125 
126  result = avcodec_open2(ctx, codec, NULL);
127  if (result < 0) {
128  av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
129  return result;
130  }
131 
132  fr = av_frame_alloc();
133  if (!fr) {
134  av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
135  return AVERROR(ENOMEM);
136  }
137 
138  if (strcmp(codec->name, "flv") && strcmp(codec->name, "mpeg4") && strcmp(codec->name, "huffyuv")) {
139  av_log(NULL, AV_LOG_ERROR, "Wrong codec\n");
140  return -1;
141  }
142 
143  byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 32);
144  byte_buffer = av_malloc(byte_buffer_size);
145  if (!byte_buffer) {
146  av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
147  return AVERROR(ENOMEM);
148  }
149 
150  slice_byte_buffer = av_malloc(byte_buffer_size);
151  if (!slice_byte_buffer) {
152  av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
153  return AVERROR(ENOMEM);
154  }
155  memset(slice_byte_buffer, 0, byte_buffer_size);
156  slice_byte_buffer_size = byte_buffer_size;
157 
158  av_init_packet(&pkt);
159  do {
160  if (!end_of_stream) {
161  if (av_read_frame(fmt_ctx, &pkt) < 0) {
162  end_of_stream = 1;
163  }
164  }
165  if (end_of_stream) {
166  pkt.data = NULL;
167  pkt.size = 0;
168  }
169  if (pkt.stream_index == video_stream || end_of_stream) {
170  got_frame = 0;
171  result = avcodec_decode_video2(ctx, fr, &got_frame, &pkt);
172  if (result < 0) {
173  av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");
174  return result;
175  }
176  if (got_frame) {
177  number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,
178  (const uint8_t* const *)fr->data, (const int*) fr->linesize,
179  ctx->pix_fmt, ctx->width, ctx->height, 1);
180  if (number_of_written_bytes < 0) {
181  av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");
182  return number_of_written_bytes;
183  }
184  if (draw_horiz_band_called == 0) {
185  av_log(NULL, AV_LOG_ERROR, "draw_horiz_band haven't been called!\n");
186  return -1;
187  }
188  if (av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes) !=
189  av_adler32_update(0, (const uint8_t*)slice_byte_buffer, number_of_written_bytes)) {
190  av_log(NULL, AV_LOG_ERROR, "Decoded frames with and without draw_horiz_band are not the same!\n");
191  return -1;
192  }
193  }
194  av_packet_unref(&pkt);
195  av_init_packet(&pkt);
196  }
197  } while (!end_of_stream || got_frame);
198 
199  av_packet_unref(&pkt);
200  av_frame_free(&fr);
201  avcodec_close(ctx);
202  avformat_close_input(&fmt_ctx);
203  avcodec_free_context(&ctx);
204  av_freep(&byte_buffer);
206  return 0;
207 }
208 
209 int main(int argc, char **argv)
210 {
211  if (argc < 2)
212  {
213  av_log(NULL, AV_LOG_ERROR, "Incorrect input: expected %s <name of a video file>\nNote that test works only for huffyuv, flv and mpeg4 decoders\n", argv[0]);
214  return 1;
215  }
216 
217  if (video_decode(argv[1]) != 0)
218  return 1;
219 
220  return 0;
221 }
#define NULL
Definition: coverity.c:32
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2522
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 void draw_horiz_band(AVCodecContext *ctx, const AVFrame *fr, int offset[4], int slice_position, int type, int height)
Definition: api-band-test.c:36
static AVFormatContext * fmt_ctx
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
int size
Definition: avcodec.h:1481
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1778
static AVStream * video_stream
GLint GLenum type
Definition: opengl_enc.c:104
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:539
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3492
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:92
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3960
void(* draw_horiz_band)(struct AVCodecContext *s, const AVFrame *src, int offset[AV_NUM_DATA_POINTERS], int y, int type, int height)
If non NULL, &#39;draw_horiz_band&#39; is called by the libavcodec decoder to draw a horizontal band...
Definition: avcodec.h:1803
static int video_decode(const char *input_filename)
Definition: api-band-test.c:67
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
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
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: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
#define height
uint8_t * data
Definition: avcodec.h:1480
#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:4226
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
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:101
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
int main(int argc, char **argv)
const char * name
Name of the codec implementation.
Definition: avcodec.h:3499
uint8_t slice_byte_buffer_size
Definition: api-band-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:1741
AVFormatContext * ctx
Definition: movenc.c:48
static const char * input_filename
Definition: ffplay.c:311
int thread_count
thread count is used to decide how many independent tasks should be passed to execute() ...
Definition: avcodec.h:2827
uint8_t * slice_byte_buffer
draw_horiz_band test.
Definition: api-band-test.c:32
Public header for Adler-32 hash function implementation.
Libavcodec external API header.
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:897
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
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
int draw_horiz_band_called
Definition: api-band-test.c:34
main external API structure.
Definition: avcodec.h:1568
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:896
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:1777
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
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:3600
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4474
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:1028
int stream_index
Definition: avcodec.h:1482
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: avcodec.h:1457