FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
qsvdec.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2015 Anton Khirnov
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  * @file
25  * Intel QSV-accelerated H.264 decoding example.
26  *
27  * @example qsvdec.c
28  * This example shows how to do QSV-accelerated H.264 decoding with output
29  * frames in the VA-API video surfaces.
30  */
31 
32 #include "config.h"
33 
34 #include <stdio.h>
35 
36 #include <mfx/mfxvideo.h>
37 
38 #include <va/va.h>
39 #include <va/va_x11.h>
40 #include <X11/Xlib.h>
41 
42 #include "libavformat/avformat.h"
43 #include "libavformat/avio.h"
44 
45 #include "libavcodec/avcodec.h"
46 #include "libavcodec/qsv.h"
47 
48 #include "libavutil/error.h"
49 #include "libavutil/mem.h"
50 
51 typedef struct DecodeContext {
52  mfxSession mfx_session;
53  VADisplay va_dpy;
54 
55  VASurfaceID *surfaces;
56  mfxMemId *surface_ids;
59 
60  mfxFrameInfo frame_info;
62 
63 static mfxStatus frame_alloc(mfxHDL pthis, mfxFrameAllocRequest *req,
64  mfxFrameAllocResponse *resp)
65 {
66  DecodeContext *decode = pthis;
67  int err, i;
68 
69  if (decode->surfaces) {
70  fprintf(stderr, "Multiple allocation requests.\n");
71  return MFX_ERR_MEMORY_ALLOC;
72  }
73  if (!(req->Type & MFX_MEMTYPE_VIDEO_MEMORY_DECODER_TARGET)) {
74  fprintf(stderr, "Unsupported surface type: %d\n", req->Type);
75  return MFX_ERR_UNSUPPORTED;
76  }
77  if (req->Info.BitDepthLuma != 8 || req->Info.BitDepthChroma != 8 ||
78  req->Info.Shift || req->Info.FourCC != MFX_FOURCC_NV12 ||
79  req->Info.ChromaFormat != MFX_CHROMAFORMAT_YUV420) {
80  fprintf(stderr, "Unsupported surface properties.\n");
81  return MFX_ERR_UNSUPPORTED;
82  }
83 
84  decode->surfaces = av_malloc_array (req->NumFrameSuggested, sizeof(*decode->surfaces));
85  decode->surface_ids = av_malloc_array (req->NumFrameSuggested, sizeof(*decode->surface_ids));
86  decode->surface_used = av_mallocz_array(req->NumFrameSuggested, sizeof(*decode->surface_used));
87  if (!decode->surfaces || !decode->surface_ids || !decode->surface_used)
88  goto fail;
89 
90  err = vaCreateSurfaces(decode->va_dpy, VA_RT_FORMAT_YUV420,
91  req->Info.Width, req->Info.Height,
92  decode->surfaces, req->NumFrameSuggested,
93  NULL, 0);
94  if (err != VA_STATUS_SUCCESS) {
95  fprintf(stderr, "Error allocating VA surfaces\n");
96  goto fail;
97  }
98  decode->nb_surfaces = req->NumFrameSuggested;
99 
100  for (i = 0; i < decode->nb_surfaces; i++)
101  decode->surface_ids[i] = &decode->surfaces[i];
102 
103  resp->mids = decode->surface_ids;
104  resp->NumFrameActual = decode->nb_surfaces;
105 
106  decode->frame_info = req->Info;
107 
108  return MFX_ERR_NONE;
109 fail:
110  av_freep(&decode->surfaces);
111  av_freep(&decode->surface_ids);
112  av_freep(&decode->surface_used);
113 
114  return MFX_ERR_MEMORY_ALLOC;
115 }
116 
117 static mfxStatus frame_free(mfxHDL pthis, mfxFrameAllocResponse *resp)
118 {
119  return MFX_ERR_NONE;
120 }
121 
122 static mfxStatus frame_lock(mfxHDL pthis, mfxMemId mid, mfxFrameData *ptr)
123 {
124  return MFX_ERR_UNSUPPORTED;
125 }
126 
127 static mfxStatus frame_unlock(mfxHDL pthis, mfxMemId mid, mfxFrameData *ptr)
128 {
129  return MFX_ERR_UNSUPPORTED;
130 }
131 
132 static mfxStatus frame_get_hdl(mfxHDL pthis, mfxMemId mid, mfxHDL *hdl)
133 {
134  *hdl = mid;
135  return MFX_ERR_NONE;
136 }
137 
139 {
140  if (decode->surfaces)
141  vaDestroySurfaces(decode->va_dpy, decode->surfaces, decode->nb_surfaces);
142  av_freep(&decode->surfaces);
143  av_freep(&decode->surface_ids);
144  av_freep(&decode->surface_used);
145  decode->nb_surfaces = 0;
146 }
147 
148 static void free_buffer(void *opaque, uint8_t *data)
149 {
150  int *used = opaque;
151  *used = 0;
152  av_freep(&data);
153 }
154 
155 static int get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
156 {
157  DecodeContext *decode = avctx->opaque;
158 
159  mfxFrameSurface1 *surf;
160  AVBufferRef *surf_buf;
161  int idx;
162 
163  for (idx = 0; idx < decode->nb_surfaces; idx++) {
164  if (!decode->surface_used[idx])
165  break;
166  }
167  if (idx == decode->nb_surfaces) {
168  fprintf(stderr, "No free surfaces\n");
169  return AVERROR(ENOMEM);
170  }
171 
172  surf = av_mallocz(sizeof(*surf));
173  if (!surf)
174  return AVERROR(ENOMEM);
175  surf_buf = av_buffer_create((uint8_t*)surf, sizeof(*surf), free_buffer,
176  &decode->surface_used[idx], AV_BUFFER_FLAG_READONLY);
177  if (!surf_buf) {
178  av_freep(&surf);
179  return AVERROR(ENOMEM);
180  }
181 
182  surf->Info = decode->frame_info;
183  surf->Data.MemId = &decode->surfaces[idx];
184 
185  frame->buf[0] = surf_buf;
186  frame->data[3] = (uint8_t*)surf;
187 
188  decode->surface_used[idx] = 1;
189 
190  return 0;
191 }
192 
193 static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts)
194 {
195  while (*pix_fmts != AV_PIX_FMT_NONE) {
196  if (*pix_fmts == AV_PIX_FMT_QSV) {
197  if (!avctx->hwaccel_context) {
198  DecodeContext *decode = avctx->opaque;
200  if (!qsv)
201  return AV_PIX_FMT_NONE;
202 
203  qsv->session = decode->mfx_session;
204  qsv->iopattern = MFX_IOPATTERN_OUT_VIDEO_MEMORY;
205 
206  avctx->hwaccel_context = qsv;
207  }
208 
209  return AV_PIX_FMT_QSV;
210  }
211 
212  pix_fmts++;
213  }
214 
215  fprintf(stderr, "The QSV pixel format not offered in get_format()\n");
216 
217  return AV_PIX_FMT_NONE;
218 }
219 
222  AVIOContext *output_ctx)
223 {
224  int ret = 0;
225  int got_frame = 1;
226 
227  while (pkt->size > 0 || (!pkt->data && got_frame)) {
228  ret = avcodec_decode_video2(decoder_ctx, frame, &got_frame, pkt);
229  if (ret < 0) {
230  fprintf(stderr, "Error during decoding\n");
231  return ret;
232  }
233 
234  pkt->data += ret;
235  pkt->size -= ret;
236 
237  /* A real program would do something useful with the decoded frame here.
238  * We just retrieve the raw data and write it to a file, which is rather
239  * useless but pedagogic. */
240  if (got_frame) {
241  mfxFrameSurface1 *surf = (mfxFrameSurface1*)frame->data[3];
242  VASurfaceID surface = *(VASurfaceID*)surf->Data.MemId;
243 
244  VAImageFormat img_fmt = {
245  .fourcc = VA_FOURCC_NV12,
246  .byte_order = VA_LSB_FIRST,
247  .bits_per_pixel = 8,
248  .depth = 8,
249  };
250 
251  VAImage img;
252 
253  VAStatus err;
254  uint8_t *data;
255  int i, j;
256 
257  img.buf = VA_INVALID_ID;
258  img.image_id = VA_INVALID_ID;
259 
260  err = vaCreateImage(decode->va_dpy, &img_fmt,
261  frame->width, frame->height, &img);
262  if (err != VA_STATUS_SUCCESS) {
263  fprintf(stderr, "Error creating an image: %s\n",
264  vaErrorStr(err));
265  ret = AVERROR_UNKNOWN;
266  goto fail;
267  }
268 
269  err = vaGetImage(decode->va_dpy, surface, 0, 0,
270  frame->width, frame->height,
271  img.image_id);
272  if (err != VA_STATUS_SUCCESS) {
273  fprintf(stderr, "Error getting an image: %s\n",
274  vaErrorStr(err));
275  ret = AVERROR_UNKNOWN;
276  goto fail;
277  }
278 
279  err = vaMapBuffer(decode->va_dpy, img.buf, (void**)&data);
280  if (err != VA_STATUS_SUCCESS) {
281  fprintf(stderr, "Error mapping the image buffer: %s\n",
282  vaErrorStr(err));
283  ret = AVERROR_UNKNOWN;
284  goto fail;
285  }
286 
287  for (i = 0; i < img.num_planes; i++)
288  for (j = 0; j < (img.height >> (i > 0)); j++)
289  avio_write(output_ctx, data + img.offsets[i] + j * img.pitches[i], img.width);
290 
291 fail:
292  if (img.buf != VA_INVALID_ID)
293  vaUnmapBuffer(decode->va_dpy, img.buf);
294  if (img.image_id != VA_INVALID_ID)
295  vaDestroyImage(decode->va_dpy, img.image_id);
296  av_frame_unref(frame);
297 
298  if (ret < 0)
299  return ret;
300  }
301  }
302 
303  return 0;
304 }
305 
306 int main(int argc, char **argv)
307 {
308  AVFormatContext *input_ctx = NULL;
310  AVCodecContext *decoder_ctx = NULL;
311  const AVCodec *decoder;
312 
313  AVPacket pkt = { 0 };
314  AVFrame *frame = NULL;
315 
316  DecodeContext decode = { NULL };
317 
318  Display *dpy = NULL;
319  int va_ver_major, va_ver_minor;
320 
321  mfxIMPL mfx_impl = MFX_IMPL_AUTO_ANY;
322  mfxVersion mfx_ver = { { 1, 1 } };
323 
324  mfxFrameAllocator frame_allocator = {
325  .pthis = &decode,
326  .Alloc = frame_alloc,
327  .Lock = frame_lock,
328  .Unlock = frame_unlock,
329  .GetHDL = frame_get_hdl,
330  .Free = frame_free,
331  };
332 
333  AVIOContext *output_ctx = NULL;
334 
335  int ret, i, err;
336 
337  av_register_all();
338 
339  if (argc < 3) {
340  fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]);
341  return 1;
342  }
343 
344  /* open the input file */
345  ret = avformat_open_input(&input_ctx, argv[1], NULL, NULL);
346  if (ret < 0) {
347  fprintf(stderr, "Cannot open input file '%s': ", argv[1]);
348  goto finish;
349  }
350 
351  /* find the first H.264 video stream */
352  for (i = 0; i < input_ctx->nb_streams; i++) {
353  AVStream *st = input_ctx->streams[i];
354 
355  if (st->codecpar->codec_id == AV_CODEC_ID_H264 && !video_st)
356  video_st = st;
357  else
358  st->discard = AVDISCARD_ALL;
359  }
360  if (!video_st) {
361  fprintf(stderr, "No H.264 video stream in the input file\n");
362  goto finish;
363  }
364 
365  /* initialize VA-API */
366  dpy = XOpenDisplay(NULL);
367  if (!dpy) {
368  fprintf(stderr, "Cannot open the X display\n");
369  goto finish;
370  }
371  decode.va_dpy = vaGetDisplay(dpy);
372  if (!decode.va_dpy) {
373  fprintf(stderr, "Cannot open the VA display\n");
374  goto finish;
375  }
376 
377  err = vaInitialize(decode.va_dpy, &va_ver_major, &va_ver_minor);
378  if (err != VA_STATUS_SUCCESS) {
379  fprintf(stderr, "Cannot initialize VA: %s\n", vaErrorStr(err));
380  goto finish;
381  }
382  fprintf(stderr, "Initialized VA v%d.%d\n", va_ver_major, va_ver_minor);
383 
384  /* initialize an MFX session */
385  err = MFXInit(mfx_impl, &mfx_ver, &decode.mfx_session);
386  if (err != MFX_ERR_NONE) {
387  fprintf(stderr, "Error initializing an MFX session\n");
388  goto finish;
389  }
390 
391  MFXVideoCORE_SetHandle(decode.mfx_session, MFX_HANDLE_VA_DISPLAY, decode.va_dpy);
392  MFXVideoCORE_SetFrameAllocator(decode.mfx_session, &frame_allocator);
393 
394  /* initialize the decoder */
395  decoder = avcodec_find_decoder_by_name("h264_qsv");
396  if (!decoder) {
397  fprintf(stderr, "The QSV decoder is not present in libavcodec\n");
398  goto finish;
399  }
400 
401  decoder_ctx = avcodec_alloc_context3(decoder);
402  if (!decoder_ctx) {
403  ret = AVERROR(ENOMEM);
404  goto finish;
405  }
406  decoder_ctx->codec_id = AV_CODEC_ID_H264;
407  if (video_st->codecpar->extradata_size) {
408  decoder_ctx->extradata = av_mallocz(video_st->codecpar->extradata_size +
410  if (!decoder_ctx->extradata) {
411  ret = AVERROR(ENOMEM);
412  goto finish;
413  }
414  memcpy(decoder_ctx->extradata, video_st->codecpar->extradata,
415  video_st->codecpar->extradata_size);
416  decoder_ctx->extradata_size = video_st->codecpar->extradata_size;
417  }
418  decoder_ctx->refcounted_frames = 1;
419 
420  decoder_ctx->opaque = &decode;
421  decoder_ctx->get_buffer2 = get_buffer;
422  decoder_ctx->get_format = get_format;
423 
424  ret = avcodec_open2(decoder_ctx, NULL, NULL);
425  if (ret < 0) {
426  fprintf(stderr, "Error opening the decoder: ");
427  goto finish;
428  }
429 
430  /* open the output stream */
431  ret = avio_open(&output_ctx, argv[2], AVIO_FLAG_WRITE);
432  if (ret < 0) {
433  fprintf(stderr, "Error opening the output context: ");
434  goto finish;
435  }
436 
437  frame = av_frame_alloc();
438  if (!frame) {
439  ret = AVERROR(ENOMEM);
440  goto finish;
441  }
442 
443  /* actual decoding */
444  while (ret >= 0) {
445  ret = av_read_frame(input_ctx, &pkt);
446  if (ret < 0)
447  break;
448 
449  if (pkt.stream_index == video_st->index)
450  ret = decode_packet(&decode, decoder_ctx, frame, &pkt, output_ctx);
451 
452  av_packet_unref(&pkt);
453  }
454 
455  /* flush the decoder */
456  pkt.data = NULL;
457  pkt.size = 0;
458  ret = decode_packet(&decode, decoder_ctx, frame, &pkt, output_ctx);
459 
460 finish:
461  if (ret < 0) {
462  char buf[1024];
463  av_strerror(ret, buf, sizeof(buf));
464  fprintf(stderr, "%s\n", buf);
465  }
466 
467  avformat_close_input(&input_ctx);
468 
469  av_frame_free(&frame);
470 
471  if (decoder_ctx)
472  av_freep(&decoder_ctx->hwaccel_context);
473  avcodec_free_context(&decoder_ctx);
474 
475  free_surfaces(&decode);
476 
477  if (decode.mfx_session)
478  MFXClose(decode.mfx_session);
479  if (decode.va_dpy)
480  vaTerminate(decode.va_dpy);
481  if (dpy)
482  XCloseDisplay(dpy);
483 
484  avio_close(output_ctx);
485 
486  return ret;
487 }
int avio_open(AVIOContext **s, const char *url, int flags)
Create and initialize a AVIOContext for accessing the resource indicated by url.
Definition: aviobuf.c:1055
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:155
Buffered I/O operations.
This structure describes decoded (raw) audio or video data.
Definition: frame.h:187
mfxSession mfx_session
Definition: qsvdec.c:52
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
Memory handling functions.
AVBufferRef * buf[AV_NUM_DATA_POINTERS]
AVBuffer references backing the data for this frame.
Definition: frame.h:370
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:4066
int index
stream index in AVFormatContext
Definition: avformat.h:890
int size
Definition: avcodec.h:1658
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:621
static mfxStatus frame_lock(mfxHDL pthis, mfxMemId mid, mfxFrameData *ptr)
Definition: qsvdec.c:122
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:222
discard all
Definition: avcodec.h:822
static AVPacket pkt
AVCodec.
Definition: avcodec.h:3681
Format I/O context.
Definition: avformat.h:1349
int * surface_used
Definition: qsvdec.c:57
#define img
static mfxStatus frame_alloc(mfxHDL pthis, mfxFrameAllocRequest *req, mfxFrameAllocResponse *resp)
Definition: qsvdec.c:63
uint8_t
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:150
void * hwaccel_context
Hardware accelerator context.
Definition: avcodec.h:3064
static mfxStatus frame_get_hdl(mfxHDL pthis, mfxMemId mid, mfxHDL *hdl)
Definition: qsvdec.c:132
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1847
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1417
static AVFrame * frame
static void finish(void)
Definition: movenc.c:344
uint8_t * data
Definition: avcodec.h:1657
static int flags
Definition: log.c:57
#define AV_BUFFER_FLAG_READONLY
Always treat the buffer as read-only, even when it has only one reference.
Definition: buffer.h:113
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:205
static mfxStatus frame_unlock(mfxHDL pthis, mfxMemId mid, mfxFrameData *ptr)
Definition: qsvdec.c:127
int width
width and height of the video frame
Definition: frame.h:239
static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts)
Definition: qsvdec.c:193
int main(int argc, char **argv)
Definition: qsvdec.c:306
error code definitions
mfxFrameInfo frame_info
Definition: qsvdec.c:60
#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:163
int avio_close(AVIOContext *s)
Close the resource accessed by the AVIOContext s and free it.
Definition: aviobuf.c:1091
mfxMemId * surface_ids
Definition: qsvdec.c:56
AVStream * video_st
Definition: movenc.c:59
AVBufferRef * av_buffer_create(uint8_t *data, int size, void(*free)(void *opaque, uint8_t *data), void *opaque, int flags)
Create an AVBuffer from an existing array.
Definition: buffer.c:28
int iopattern
The IO pattern to use.
Definition: qsv.h:46
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:229
#define fail()
Definition: checkasm.h:89
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:4084
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1405
VASurfaceID * surfaces
Definition: qsvdec.c:55
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:157
static const chunk_decoder decoder[8]
Definition: dfa.c:328
int refcounted_frames
If non-zero, the decoded audio and video frames returned from avcodec_decode_video2() and avcodec_dec...
Definition: avcodec.h:2664
Stream structure.
Definition: avformat.h:889
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: utils.c:2227
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:172
enum AVCodecID codec_id
Definition: avcodec.h:1749
main external API structure.
Definition: avcodec.h:1732
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:589
void * buf
Definition: avisynth_c.h:690
int extradata_size
Definition: avcodec.h:1848
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
callback to negotiate the pixelFormat
Definition: avcodec.h:2010
AVQSVContext * av_qsv_alloc_context(void)
Allocate a new context.
Definition: qsv_api.c:38
int nb_surfaces
Definition: qsvdec.c:58
HW acceleration through QSV, data[3] contains a pointer to the mfxFrameSurface1 structure.
Definition: pixfmt.h:236
int(* get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags)
This callback is called at the beginning of each frame to get data buffer(s) for it.
Definition: avcodec.h:2649
static int get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Definition: qsvdec.c:155
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: utils.c:1242
This struct is used for communicating QSV parameters between libavcodec and the caller.
Definition: qsv.h:36
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1710
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:262
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:498
static int decode_packet(DecodeContext *decode, AVCodecContext *decoder_ctx, AVFrame *frame, AVPacket *pkt, AVIOContext *output_ctx)
Definition: qsvdec.c:220
AVCodec * avcodec_find_decoder_by_name(const char *name)
Find a registered decoder with the specified name.
Definition: utils.c:3173
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:201
int av_strerror(int errnum, char *errbuf, size_t errbuf_size)
Put a description of the AVERROR code errnum in errbuf.
Definition: error.c:105
A reference to a data buffer.
Definition: buffer.h:81
Main libavformat public API header.
static void free_buffer(void *opaque, uint8_t *data)
Definition: qsvdec.c:148
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
Definition: error.h:71
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4203
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:769
VADisplay va_dpy
Definition: qsvdec.c:53
static void free_surfaces(DecodeContext *decode)
Definition: qsvdec.c:138
int avformat_open_input(AVFormatContext **ps, const char *url, AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:510
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:4080
int height
Definition: frame.h:239
#define av_freep(p)
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: ffmpeg.c:2257
static mfxStatus frame_free(mfxHDL pthis, mfxFrameAllocResponse *resp)
Definition: qsvdec.c:117
AVCodecParameters * codecpar
Definition: avformat.h:1252
#define av_malloc_array(a, b)
int stream_index
Definition: avcodec.h:1659
enum AVDiscard discard
Selects which packets can be discarded at will and do not need to be demuxed.
Definition: avformat.h:952
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
This structure stores compressed data.
Definition: avcodec.h:1634
void av_register_all(void)
Initialize libavformat and register all the muxers, demuxers and protocols.
Definition: allformats.c:385
mfxSession session
If non-NULL, the session to use for encoding or decoding.
Definition: qsv.h:41
void * opaque
Private data of the user, can be used to carry app specific stuff.
Definition: avcodec.h:1789