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
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  * 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  const 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 byte_buffer_size;
79  int result;
80 
82 
84  if (result < 0) {
85  av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
86  return result;
87  }
88 
90  if (result < 0) {
91  av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
92  return result;
93  }
94 
96  if (video_stream < 0) {
97  av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
98  return -1;
99  }
100 
101  origin_par = fmt_ctx->streams[video_stream]->codecpar;
102 
103  codec = avcodec_find_decoder(origin_par->codec_id);
104  if (!codec) {
105  av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
106  return -1;
107  }
108 
109  ctx = avcodec_alloc_context3(codec);
110  if (!ctx) {
111  av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
112  return AVERROR(ENOMEM);
113  }
114 
116  if (result) {
117  av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
118  return result;
119  }
120 
121  ctx->draw_horiz_band = draw_horiz_band;
122  ctx->thread_count = 1;
123 
124  result = avcodec_open2(ctx, codec, NULL);
125  if (result < 0) {
126  av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
127  return result;
128  }
129 
130  fr = av_frame_alloc();
131  if (!fr) {
132  av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
133  return AVERROR(ENOMEM);
134  }
135 
136  pkt = av_packet_alloc();
137  if (!pkt) {
138  av_log(NULL, AV_LOG_ERROR, "Cannot allocate packet\n");
139  return AVERROR(ENOMEM);
140  }
141 
142  if (strcmp(codec->name, "flv") && strcmp(codec->name, "mpeg4") && strcmp(codec->name, "huffyuv")) {
143  av_log(NULL, AV_LOG_ERROR, "Wrong codec\n");
144  return -1;
145  }
146 
147  byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 32);
148  byte_buffer = av_malloc(byte_buffer_size);
149  if (!byte_buffer) {
150  av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
151  return AVERROR(ENOMEM);
152  }
153 
154  slice_byte_buffer = av_malloc(byte_buffer_size);
155  if (!slice_byte_buffer) {
156  av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
157  return AVERROR(ENOMEM);
158  }
159  memset(slice_byte_buffer, 0, byte_buffer_size);
160  slice_byte_buffer_size = byte_buffer_size;
161 
162  result = 0;
163  while (result >= 0) {
165  if (result >= 0 && pkt->stream_index != video_stream) {
167  continue;
168  }
169 
170  // pkt will be empty on read error/EOF
172 
174 
175  if (result < 0) {
176  av_log(NULL, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
177  return result;
178  }
179 
180  while (result >= 0) {
182  if (result == AVERROR_EOF)
183  goto finish;
184  else if (result == AVERROR(EAGAIN)) {
185  result = 0;
186  break;
187  } else if (result < 0) {
188  av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");
189  return result;
190  }
191 
192  number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,
193  (const uint8_t* const *)fr->data, (const int*) fr->linesize,
194  ctx->pix_fmt, ctx->width, ctx->height, 1);
195  if (number_of_written_bytes < 0) {
196  av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");
197  return number_of_written_bytes;
198  }
199  if (draw_horiz_band_called == 0) {
200  av_log(NULL, AV_LOG_ERROR, "draw_horiz_band haven't been called!\n");
201  return -1;
202  }
203  if (av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes) !=
204  av_adler32_update(0, (const uint8_t*)slice_byte_buffer, number_of_written_bytes)) {
205  av_log(NULL, AV_LOG_ERROR, "Decoded frames with and without draw_horiz_band are not the same!\n");
206  return -1;
207  }
208  av_frame_unref(fr);
209  }
210  }
211 
212 finish:
214  av_frame_free(&fr);
217  av_freep(&byte_buffer);
219  return 0;
220 }
221 
222 int main(int argc, char **argv)
223 {
224  if (argc < 2)
225  {
226  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]);
227  return 1;
228  }
229 
230  if (video_decode(argv[1]) != 0)
231  return 1;
232 
233  return 0;
234 }
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:417
AVCodec
AVCodec.
Definition: codec.h:202
draw_horiz_band
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
AVERROR
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
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2564
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:112
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1177
av_read_frame
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: demux.c:1414
av_packet_free
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:75
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
av_find_best_stream
int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, const AVCodec **decoder_ret, int flags)
Find the "best" stream in the file.
Definition: utils.c:500
avformat_close_input
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: demux.c:355
finish
static void finish(void)
Definition: movenc.c:342
video_decode
static int video_decode(const char *input_filename)
Definition: api-band-test.c:67
type
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 type
Definition: writing_filters.txt:86
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:99
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
avformat_open_input
int avformat_open_input(AVFormatContext **ps, const char *url, const AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: demux.c:207
avcodec_alloc_context3
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:141
avcodec_receive_frame
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
Definition: decode.c:643
ctx
AVFormatContext * ctx
Definition: movenc.c:48
AVPixFmtDescriptor::log2_chroma_w
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:80
AVFormatContext
Format I/O context.
Definition: avformat.h:1109
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1004
result
and forward the result(frame or status change) to the corresponding input. If nothing is possible
NULL
#define NULL
Definition: coverity.c:32
slice_byte_buffer
uint8_t * slice_byte_buffer
draw_horiz_band test.
Definition: api-band-test.c:32
fmt_ctx
static AVFormatContext * fmt_ctx
Definition: demuxing_decoding.c:38
main
int main(int argc, char **argv)
Definition: api-band-test.c:222
avcodec_free_context
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:156
adler32.h
avcodec_open2
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: avcodec.c:137
av_adler32_update
AVAdler av_adler32_update(AVAdler adler, const uint8_t *buf, size_t len)
Calculate the Adler32 checksum of a buffer.
Definition: adler32.c:44
avcodec_find_decoder
const AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:919
avformat_find_stream_info
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: demux.c:2396
height
#define height
av_image_get_buffer_size
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
slice_byte_buffer_size
uint8_t slice_byte_buffer_size
Definition: api-band-test.c:33
offset
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
Definition: writing_filters.txt:86
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:64
avcodec_send_packet
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Definition: decode.c:580
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
avcodec_parameters_to_context
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
Definition: codec_par.c:147
draw_horiz_band_called
int draw_horiz_band_called
Definition: api-band-test.c:34
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:437
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:209
avcodec.h
video_stream
static AVStream * video_stream
Definition: demuxing_decoding.c:42
avformat.h
AVCodecContext
main external API structure.
Definition: avcodec.h:383
AVPacket::stream_index
int stream_index
Definition: packet.h:375
input_filename
static const char * input_filename
Definition: ffplay.c:310
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
av_image_copy_to_buffer
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:501
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
imgutils.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:334
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVPixFmtDescriptor::log2_chroma_h
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:89