2 * Copyright (c) 2015 Anton Khirnov
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:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
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
25 * Intel QSV-accelerated H.264 decoding example.
28 * This example shows how to do QSV-accelerated H.264 decoding with output
29 * frames in the VA-API video surfaces.
36 #include <mfx/mfxvideo.h>
39 #include <va/va_x11.h>
42 #include "libavformat/avformat.h"
43 #include "libavformat/avio.h"
45 #include "libavcodec/avcodec.h"
46 #include "libavcodec/qsv.h"
48 #include "libavutil/error.h"
49 #include "libavutil/mem.h"
51 typedef struct DecodeContext {
52 mfxSession mfx_session;
55 VASurfaceID *surfaces;
56 mfxMemId *surface_ids;
60 mfxFrameInfo frame_info;
63 static mfxStatus frame_alloc(mfxHDL pthis, mfxFrameAllocRequest *req,
64 mfxFrameAllocResponse *resp)
66 DecodeContext *decode = pthis;
69 if (decode->surfaces) {
70 fprintf(stderr, "Multiple allocation requests.\n");
71 return MFX_ERR_MEMORY_ALLOC;
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;
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;
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)
90 err = vaCreateSurfaces(decode->va_dpy, VA_RT_FORMAT_YUV420,
91 req->Info.Width, req->Info.Height,
92 decode->surfaces, req->NumFrameSuggested,
94 if (err != VA_STATUS_SUCCESS) {
95 fprintf(stderr, "Error allocating VA surfaces\n");
98 decode->nb_surfaces = req->NumFrameSuggested;
100 for (i = 0; i < decode->nb_surfaces; i++)
101 decode->surface_ids[i] = &decode->surfaces[i];
103 resp->mids = decode->surface_ids;
104 resp->NumFrameActual = decode->nb_surfaces;
106 decode->frame_info = req->Info;
110 av_freep(&decode->surfaces);
111 av_freep(&decode->surface_ids);
112 av_freep(&decode->surface_used);
114 return MFX_ERR_MEMORY_ALLOC;
117 static mfxStatus frame_free(mfxHDL pthis, mfxFrameAllocResponse *resp)
119 DecodeContext *decode = pthis;
121 if (decode->surfaces)
122 vaDestroySurfaces(decode->va_dpy, decode->surfaces, decode->nb_surfaces);
123 av_freep(&decode->surfaces);
124 av_freep(&decode->surface_ids);
125 av_freep(&decode->surface_used);
126 decode->nb_surfaces = 0;
131 static mfxStatus frame_lock(mfxHDL pthis, mfxMemId mid, mfxFrameData *ptr)
133 return MFX_ERR_UNSUPPORTED;
136 static mfxStatus frame_unlock(mfxHDL pthis, mfxMemId mid, mfxFrameData *ptr)
138 return MFX_ERR_UNSUPPORTED;
141 static mfxStatus frame_get_hdl(mfxHDL pthis, mfxMemId mid, mfxHDL *hdl)
147 static void free_buffer(void *opaque, uint8_t *data)
154 static int get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
156 DecodeContext *decode = avctx->opaque;
158 mfxFrameSurface1 *surf;
159 AVBufferRef *surf_buf;
162 for (idx = 0; idx < decode->nb_surfaces; idx++) {
163 if (!decode->surface_used[idx])
166 if (idx == decode->nb_surfaces) {
167 fprintf(stderr, "No free surfaces\n");
168 return AVERROR(ENOMEM);
171 surf = av_mallocz(sizeof(*surf));
173 return AVERROR(ENOMEM);
174 surf_buf = av_buffer_create((uint8_t*)surf, sizeof(*surf), free_buffer,
175 &decode->surface_used[idx], AV_BUFFER_FLAG_READONLY);
178 return AVERROR(ENOMEM);
181 surf->Info = decode->frame_info;
182 surf->Data.MemId = &decode->surfaces[idx];
184 frame->buf[0] = surf_buf;
185 frame->data[3] = (uint8_t*)surf;
187 decode->surface_used[idx] = 1;
192 static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts)
194 while (*pix_fmts != AV_PIX_FMT_NONE) {
195 if (*pix_fmts == AV_PIX_FMT_QSV) {
196 if (!avctx->hwaccel_context) {
197 DecodeContext *decode = avctx->opaque;
198 AVQSVContext *qsv = av_qsv_alloc_context();
200 return AV_PIX_FMT_NONE;
202 qsv->session = decode->mfx_session;
203 qsv->iopattern = MFX_IOPATTERN_OUT_VIDEO_MEMORY;
205 avctx->hwaccel_context = qsv;
208 return AV_PIX_FMT_QSV;
214 fprintf(stderr, "The QSV pixel format not offered in get_format()\n");
216 return AV_PIX_FMT_NONE;
219 static int decode_packet(DecodeContext *decode, AVCodecContext *decoder_ctx,
220 AVFrame *frame, AVPacket *pkt,
221 AVIOContext *output_ctx)
226 while (pkt->size > 0 || (!pkt->data && got_frame)) {
227 ret = avcodec_decode_video2(decoder_ctx, frame, &got_frame, pkt);
229 fprintf(stderr, "Error during decoding\n");
236 /* A real program would do something useful with the decoded frame here.
237 * We just retrieve the raw data and write it to a file, which is rather
238 * useless but pedagogic. */
240 mfxFrameSurface1 *surf = (mfxFrameSurface1*)frame->data[3];
241 VASurfaceID surface = *(VASurfaceID*)surf->Data.MemId;
243 VAImageFormat img_fmt = {
244 .fourcc = VA_FOURCC_NV12,
245 .byte_order = VA_LSB_FIRST,
256 img.buf = VA_INVALID_ID;
257 img.image_id = VA_INVALID_ID;
259 err = vaCreateImage(decode->va_dpy, &img_fmt,
260 frame->width, frame->height, &img);
261 if (err != VA_STATUS_SUCCESS) {
262 fprintf(stderr, "Error creating an image: %s\n",
264 ret = AVERROR_UNKNOWN;
268 err = vaGetImage(decode->va_dpy, surface, 0, 0,
269 frame->width, frame->height,
271 if (err != VA_STATUS_SUCCESS) {
272 fprintf(stderr, "Error getting an image: %s\n",
274 ret = AVERROR_UNKNOWN;
278 err = vaMapBuffer(decode->va_dpy, img.buf, (void**)&data);
279 if (err != VA_STATUS_SUCCESS) {
280 fprintf(stderr, "Error mapping the image buffer: %s\n",
282 ret = AVERROR_UNKNOWN;
286 for (i = 0; i < img.num_planes; i++)
287 for (j = 0; j < (img.height >> (i > 0)); j++)
288 avio_write(output_ctx, data + img.offsets[i] + j * img.pitches[i], img.width);
291 if (img.buf != VA_INVALID_ID)
292 vaUnmapBuffer(decode->va_dpy, img.buf);
293 if (img.image_id != VA_INVALID_ID)
294 vaDestroyImage(decode->va_dpy, img.image_id);
295 av_frame_unref(frame);
305 int main(int argc, char **argv)
307 AVFormatContext *input_ctx = NULL;
308 AVStream *video_st = NULL;
309 AVCodecContext *decoder_ctx = NULL;
310 const AVCodec *decoder;
312 AVPacket pkt = { 0 };
313 AVFrame *frame = NULL;
315 DecodeContext decode = { NULL };
318 int va_ver_major, va_ver_minor;
320 mfxIMPL mfx_impl = MFX_IMPL_AUTO_ANY;
321 mfxVersion mfx_ver = { { 1, 1 } };
323 mfxFrameAllocator frame_allocator = {
325 .Alloc = frame_alloc,
327 .Unlock = frame_unlock,
328 .GetHDL = frame_get_hdl,
332 AVIOContext *output_ctx = NULL;
339 fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]);
343 /* open the input file */
344 ret = avformat_open_input(&input_ctx, argv[1], NULL, NULL);
346 fprintf(stderr, "Cannot open input file '%s': ", argv[1]);
350 /* find the first H.264 video stream */
351 for (i = 0; i < input_ctx->nb_streams; i++) {
352 AVStream *st = input_ctx->streams[i];
354 if (st->codec->codec_id == AV_CODEC_ID_H264 && !video_st)
357 st->discard = AVDISCARD_ALL;
360 fprintf(stderr, "No H.264 video stream in the input file\n");
364 /* initialize VA-API */
365 dpy = XOpenDisplay(NULL);
367 fprintf(stderr, "Cannot open the X display\n");
370 decode.va_dpy = vaGetDisplay(dpy);
371 if (!decode.va_dpy) {
372 fprintf(stderr, "Cannot open the VA display\n");
376 err = vaInitialize(decode.va_dpy, &va_ver_major, &va_ver_minor);
377 if (err != VA_STATUS_SUCCESS) {
378 fprintf(stderr, "Cannot initialize VA: %s\n", vaErrorStr(err));
381 fprintf(stderr, "Initialized VA v%d.%d\n", va_ver_major, va_ver_minor);
383 /* initialize an MFX session */
384 err = MFXInit(mfx_impl, &mfx_ver, &decode.mfx_session);
385 if (err != MFX_ERR_NONE) {
386 fprintf(stderr, "Error initializing an MFX session\n");
390 MFXVideoCORE_SetHandle(decode.mfx_session, MFX_HANDLE_VA_DISPLAY, decode.va_dpy);
391 MFXVideoCORE_SetFrameAllocator(decode.mfx_session, &frame_allocator);
393 /* initialize the decoder */
394 decoder = avcodec_find_decoder_by_name("h264_qsv");
396 fprintf(stderr, "The QSV decoder is not present in libavcodec\n");
400 decoder_ctx = avcodec_alloc_context3(decoder);
402 ret = AVERROR(ENOMEM);
405 decoder_ctx->codec_id = AV_CODEC_ID_H264;
406 if (video_st->codec->extradata_size) {
407 decoder_ctx->extradata = av_mallocz(video_st->codec->extradata_size +
408 FF_INPUT_BUFFER_PADDING_SIZE);
409 if (!decoder_ctx->extradata) {
410 ret = AVERROR(ENOMEM);
413 memcpy(decoder_ctx->extradata, video_st->codec->extradata,
414 video_st->codec->extradata_size);
415 decoder_ctx->extradata_size = video_st->codec->extradata_size;
417 decoder_ctx->refcounted_frames = 1;
419 decoder_ctx->opaque = &decode;
420 decoder_ctx->get_buffer2 = get_buffer;
421 decoder_ctx->get_format = get_format;
423 ret = avcodec_open2(decoder_ctx, NULL, NULL);
425 fprintf(stderr, "Error opening the decoder: ");
429 /* open the output stream */
430 ret = avio_open(&output_ctx, argv[2], AVIO_FLAG_WRITE);
432 fprintf(stderr, "Error opening the output context: ");
436 frame = av_frame_alloc();
438 ret = AVERROR(ENOMEM);
442 /* actual decoding */
444 ret = av_read_frame(input_ctx, &pkt);
448 if (pkt.stream_index == video_st->index)
449 ret = decode_packet(&decode, decoder_ctx, frame, &pkt, output_ctx);
451 av_packet_unref(&pkt);
454 /* flush the decoder */
457 ret = decode_packet(&decode, decoder_ctx, frame, &pkt, output_ctx);
462 av_strerror(ret, buf, sizeof(buf));
463 fprintf(stderr, "%s\n", buf);
466 avformat_close_input(&input_ctx);
468 av_frame_free(&frame);
470 if (decode.mfx_session)
471 MFXClose(decode.mfx_session);
473 vaTerminate(decode.va_dpy);
478 av_freep(&decoder_ctx->hwaccel_context);
479 avcodec_free_context(&decoder_ctx);
481 avio_close(output_ctx);