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  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 
83  result = avformat_open_input(&fmt_ctx, input_filename, NULL, NULL);
84  if (result < 0) {
85  av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
86  return result;
87  }
88 
89  result = avformat_find_stream_info(fmt_ctx, NULL);
90  if (result < 0) {
91  av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
92  return result;
93  }
94 
95  video_stream = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
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 
115  result = avcodec_parameters_to_context(ctx, origin_par);
116  if (result) {
117  av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
118  return result;
119  }
120 
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) {
164  result = av_read_frame(fmt_ctx, pkt);
165  if (result >= 0 && pkt->stream_index != video_stream) {
166  av_packet_unref(pkt);
167  continue;
168  }
169 
170  // pkt will be empty on read error/EOF
171  result = avcodec_send_packet(ctx, pkt);
172 
173  av_packet_unref(pkt);
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) {
181  result = avcodec_receive_frame(ctx, fr);
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:
213  av_packet_free(&pkt);
214  av_frame_free(&fr);
215  avformat_close_input(&fmt_ctx);
216  avcodec_free_context(&ctx);
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 }
#define NULL
Definition: coverity.c:32
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2573
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
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 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: codec_par.h:60
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:746
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:547
AVPacket * pkt
Definition: movenc.c:59
AVCodec.
Definition: codec.h:197
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: codec_par.h:52
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:771
static int video_decode(const char *input_filename)
Definition: api-band-test.c:67
Format I/O context.
Definition: avformat.h:1247
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:75
uint8_t
#define av_malloc(s)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:191
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
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1315
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
#define height
static void finish(void)
Definition: movenc.c:342
#define AVERROR_EOF
End of file.
Definition: error.h:55
#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:4275
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
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:204
int main(int argc, char **argv)
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
Definition: decode.c:643
const char * name
Name of the codec implementation.
Definition: codec.h:204
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:45
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:170
int width
picture width / height.
Definition: avcodec.h:709
AVFormatContext * ctx
Definition: movenc.c:48
static const char * input_filename
Definition: ffplay.c:312
int thread_count
thread count is used to decide how many independent tasks should be passed to execute() ...
Definition: avcodec.h:1773
uint8_t * slice_byte_buffer
draw_horiz_band test.
Definition: api-band-test.c:32
Public header for Adler-32 hash function implementation.
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Definition: decode.c:580
Libavcodec external API header.
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:185
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
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:536
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:634
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: avcodec.c:142
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1772
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:946
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:554
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
Main libavformat public API header.
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: utils.c:3650
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4525
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:64
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:1049
int stream_index
Definition: packet.h:371
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:346
int i
Definition: input.c:407