2 * Copyright (c) 2015 Anton Khirnov
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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 GPU video surfaces.
36 #include "libavformat/avformat.h"
37 #include "libavformat/avio.h"
39 #include "libavcodec/avcodec.h"
41 #include "libavutil/buffer.h"
42 #include "libavutil/error.h"
43 #include "libavutil/hwcontext.h"
44 #include "libavutil/hwcontext_qsv.h"
45 #include "libavutil/mem.h"
47 typedef struct DecodeContext {
48 AVBufferRef *hw_device_ref;
51 static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts)
53 while (*pix_fmts != AV_PIX_FMT_NONE) {
54 if (*pix_fmts == AV_PIX_FMT_QSV) {
55 DecodeContext *decode = avctx->opaque;
56 AVHWFramesContext *frames_ctx;
57 AVQSVFramesContext *frames_hwctx;
60 /* create a pool of surfaces to be used by the decoder */
61 avctx->hw_frames_ctx = av_hwframe_ctx_alloc(decode->hw_device_ref);
62 if (!avctx->hw_frames_ctx)
63 return AV_PIX_FMT_NONE;
64 frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
65 frames_hwctx = frames_ctx->hwctx;
67 frames_ctx->format = AV_PIX_FMT_QSV;
68 frames_ctx->sw_format = avctx->sw_pix_fmt;
69 frames_ctx->width = FFALIGN(avctx->coded_width, 32);
70 frames_ctx->height = FFALIGN(avctx->coded_height, 32);
71 frames_ctx->initial_pool_size = 32;
73 frames_hwctx->frame_type = MFX_MEMTYPE_VIDEO_MEMORY_DECODER_TARGET;
75 ret = av_hwframe_ctx_init(avctx->hw_frames_ctx);
77 return AV_PIX_FMT_NONE;
79 return AV_PIX_FMT_QSV;
85 fprintf(stderr, "The QSV pixel format not offered in get_format()\n");
87 return AV_PIX_FMT_NONE;
90 static int decode_packet(DecodeContext *decode, AVCodecContext *decoder_ctx,
91 AVFrame *frame, AVFrame *sw_frame,
92 AVPacket *pkt, AVIOContext *output_ctx)
96 ret = avcodec_send_packet(decoder_ctx, pkt);
98 fprintf(stderr, "Error during decoding\n");
105 ret = avcodec_receive_frame(decoder_ctx, frame);
106 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
109 fprintf(stderr, "Error during decoding\n");
113 /* A real program would do something useful with the decoded frame here.
114 * We just retrieve the raw data and write it to a file, which is rather
115 * useless but pedagogic. */
116 ret = av_hwframe_transfer_data(sw_frame, frame, 0);
118 fprintf(stderr, "Error transferring the data to system memory\n");
122 for (i = 0; i < FF_ARRAY_ELEMS(sw_frame->data) && sw_frame->data[i]; i++)
123 for (j = 0; j < (sw_frame->height >> (i > 0)); j++)
124 avio_write(output_ctx, sw_frame->data[i] + j * sw_frame->linesize[i], sw_frame->width);
127 av_frame_unref(sw_frame);
128 av_frame_unref(frame);
137 int main(int argc, char **argv)
139 AVFormatContext *input_ctx = NULL;
140 AVStream *video_st = NULL;
141 AVCodecContext *decoder_ctx = NULL;
142 const AVCodec *decoder;
144 AVPacket pkt = { 0 };
145 AVFrame *frame = NULL, *sw_frame = NULL;
147 DecodeContext decode = { NULL };
149 AVIOContext *output_ctx = NULL;
156 fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]);
160 /* open the input file */
161 ret = avformat_open_input(&input_ctx, argv[1], NULL, NULL);
163 fprintf(stderr, "Cannot open input file '%s': ", argv[1]);
167 /* find the first H.264 video stream */
168 for (i = 0; i < input_ctx->nb_streams; i++) {
169 AVStream *st = input_ctx->streams[i];
171 if (st->codecpar->codec_id == AV_CODEC_ID_H264 && !video_st)
174 st->discard = AVDISCARD_ALL;
177 fprintf(stderr, "No H.264 video stream in the input file\n");
181 /* open the hardware device */
182 ret = av_hwdevice_ctx_create(&decode.hw_device_ref, AV_HWDEVICE_TYPE_QSV,
185 fprintf(stderr, "Cannot open the hardware device\n");
189 /* initialize the decoder */
190 decoder = avcodec_find_decoder_by_name("h264_qsv");
192 fprintf(stderr, "The QSV decoder is not present in libavcodec\n");
196 decoder_ctx = avcodec_alloc_context3(decoder);
198 ret = AVERROR(ENOMEM);
201 decoder_ctx->codec_id = AV_CODEC_ID_H264;
202 if (video_st->codecpar->extradata_size) {
203 decoder_ctx->extradata = av_mallocz(video_st->codecpar->extradata_size +
204 AV_INPUT_BUFFER_PADDING_SIZE);
205 if (!decoder_ctx->extradata) {
206 ret = AVERROR(ENOMEM);
209 memcpy(decoder_ctx->extradata, video_st->codecpar->extradata,
210 video_st->codecpar->extradata_size);
211 decoder_ctx->extradata_size = video_st->codecpar->extradata_size;
213 decoder_ctx->refcounted_frames = 1;
215 decoder_ctx->opaque = &decode;
216 decoder_ctx->get_format = get_format;
218 ret = avcodec_open2(decoder_ctx, NULL, NULL);
220 fprintf(stderr, "Error opening the decoder: ");
224 /* open the output stream */
225 ret = avio_open(&output_ctx, argv[2], AVIO_FLAG_WRITE);
227 fprintf(stderr, "Error opening the output context: ");
231 frame = av_frame_alloc();
232 sw_frame = av_frame_alloc();
233 if (!frame || !sw_frame) {
234 ret = AVERROR(ENOMEM);
238 /* actual decoding */
240 ret = av_read_frame(input_ctx, &pkt);
244 if (pkt.stream_index == video_st->index)
245 ret = decode_packet(&decode, decoder_ctx, frame, sw_frame, &pkt, output_ctx);
247 av_packet_unref(&pkt);
250 /* flush the decoder */
253 ret = decode_packet(&decode, decoder_ctx, frame, sw_frame, &pkt, output_ctx);
258 av_strerror(ret, buf, sizeof(buf));
259 fprintf(stderr, "%s\n", buf);
262 avformat_close_input(&input_ctx);
264 av_frame_free(&frame);
265 av_frame_free(&sw_frame);
267 avcodec_free_context(&decoder_ctx);
269 av_buffer_unref(&decode.hw_device_ref);
271 avio_close(output_ctx);