mirror of
https://github.com/FFmpeg/FFmpeg.git
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272 lines
8.0 KiB
C
272 lines
8.0 KiB
C
/*
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* Copyright (c) 2015 Anton Khirnov
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/**
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* @file
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* Intel QSV-accelerated H.264 decoding example.
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*
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* @example qsvdec.c
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* This example shows how to do QSV-accelerated H.264 decoding with output
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* frames in the GPU video surfaces.
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*/
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#include "config.h"
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#include <stdio.h>
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#include "libavformat/avformat.h"
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#include "libavformat/avio.h"
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#include "libavcodec/avcodec.h"
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#include "libavutil/buffer.h"
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#include "libavutil/error.h"
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#include "libavutil/hwcontext.h"
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#include "libavutil/hwcontext_qsv.h"
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#include "libavutil/mem.h"
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typedef struct DecodeContext {
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AVBufferRef *hw_device_ref;
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} DecodeContext;
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static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts)
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{
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while (*pix_fmts != AV_PIX_FMT_NONE) {
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if (*pix_fmts == AV_PIX_FMT_QSV) {
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DecodeContext *decode = avctx->opaque;
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AVHWFramesContext *frames_ctx;
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AVQSVFramesContext *frames_hwctx;
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int ret;
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/* create a pool of surfaces to be used by the decoder */
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avctx->hw_frames_ctx = av_hwframe_ctx_alloc(decode->hw_device_ref);
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if (!avctx->hw_frames_ctx)
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return AV_PIX_FMT_NONE;
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frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
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frames_hwctx = frames_ctx->hwctx;
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frames_ctx->format = AV_PIX_FMT_QSV;
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frames_ctx->sw_format = avctx->sw_pix_fmt;
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frames_ctx->width = FFALIGN(avctx->coded_width, 32);
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frames_ctx->height = FFALIGN(avctx->coded_height, 32);
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frames_ctx->initial_pool_size = 32;
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frames_hwctx->frame_type = MFX_MEMTYPE_VIDEO_MEMORY_DECODER_TARGET;
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ret = av_hwframe_ctx_init(avctx->hw_frames_ctx);
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if (ret < 0)
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return AV_PIX_FMT_NONE;
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return AV_PIX_FMT_QSV;
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}
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pix_fmts++;
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}
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fprintf(stderr, "The QSV pixel format not offered in get_format()\n");
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return AV_PIX_FMT_NONE;
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}
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static int decode_packet(DecodeContext *decode, AVCodecContext *decoder_ctx,
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AVFrame *frame, AVFrame *sw_frame,
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AVPacket *pkt, AVIOContext *output_ctx)
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{
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int ret = 0;
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ret = avcodec_send_packet(decoder_ctx, pkt);
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if (ret < 0) {
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fprintf(stderr, "Error during decoding\n");
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return ret;
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}
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while (ret >= 0) {
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int i, j;
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ret = avcodec_receive_frame(decoder_ctx, frame);
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if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
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break;
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else if (ret < 0) {
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fprintf(stderr, "Error during decoding\n");
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return ret;
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}
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/* A real program would do something useful with the decoded frame here.
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* We just retrieve the raw data and write it to a file, which is rather
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* useless but pedagogic. */
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ret = av_hwframe_transfer_data(sw_frame, frame, 0);
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if (ret < 0) {
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fprintf(stderr, "Error transferring the data to system memory\n");
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goto fail;
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}
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for (i = 0; i < FF_ARRAY_ELEMS(sw_frame->data) && sw_frame->data[i]; i++)
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for (j = 0; j < (sw_frame->height >> (i > 0)); j++)
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avio_write(output_ctx, sw_frame->data[i] + j * sw_frame->linesize[i], sw_frame->width);
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fail:
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av_frame_unref(sw_frame);
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av_frame_unref(frame);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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AVFormatContext *input_ctx = NULL;
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AVStream *video_st = NULL;
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AVCodecContext *decoder_ctx = NULL;
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const AVCodec *decoder;
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AVPacket pkt = { 0 };
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AVFrame *frame = NULL, *sw_frame = NULL;
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DecodeContext decode = { NULL };
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AVIOContext *output_ctx = NULL;
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int ret, i;
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if (argc < 3) {
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fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]);
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return 1;
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}
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/* open the input file */
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ret = avformat_open_input(&input_ctx, argv[1], NULL, NULL);
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if (ret < 0) {
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fprintf(stderr, "Cannot open input file '%s': ", argv[1]);
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goto finish;
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}
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/* find the first H.264 video stream */
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for (i = 0; i < input_ctx->nb_streams; i++) {
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AVStream *st = input_ctx->streams[i];
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if (st->codecpar->codec_id == AV_CODEC_ID_H264 && !video_st)
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video_st = st;
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else
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st->discard = AVDISCARD_ALL;
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}
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if (!video_st) {
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fprintf(stderr, "No H.264 video stream in the input file\n");
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goto finish;
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}
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/* open the hardware device */
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ret = av_hwdevice_ctx_create(&decode.hw_device_ref, AV_HWDEVICE_TYPE_QSV,
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"auto", NULL, 0);
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if (ret < 0) {
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fprintf(stderr, "Cannot open the hardware device\n");
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goto finish;
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}
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/* initialize the decoder */
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decoder = avcodec_find_decoder_by_name("h264_qsv");
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if (!decoder) {
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fprintf(stderr, "The QSV decoder is not present in libavcodec\n");
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goto finish;
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}
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decoder_ctx = avcodec_alloc_context3(decoder);
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if (!decoder_ctx) {
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ret = AVERROR(ENOMEM);
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goto finish;
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}
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decoder_ctx->codec_id = AV_CODEC_ID_H264;
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if (video_st->codecpar->extradata_size) {
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decoder_ctx->extradata = av_mallocz(video_st->codecpar->extradata_size +
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AV_INPUT_BUFFER_PADDING_SIZE);
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if (!decoder_ctx->extradata) {
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ret = AVERROR(ENOMEM);
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goto finish;
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}
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memcpy(decoder_ctx->extradata, video_st->codecpar->extradata,
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video_st->codecpar->extradata_size);
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decoder_ctx->extradata_size = video_st->codecpar->extradata_size;
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}
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decoder_ctx->opaque = &decode;
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decoder_ctx->get_format = get_format;
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ret = avcodec_open2(decoder_ctx, NULL, NULL);
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if (ret < 0) {
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fprintf(stderr, "Error opening the decoder: ");
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goto finish;
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}
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/* open the output stream */
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ret = avio_open(&output_ctx, argv[2], AVIO_FLAG_WRITE);
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if (ret < 0) {
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fprintf(stderr, "Error opening the output context: ");
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goto finish;
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}
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frame = av_frame_alloc();
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sw_frame = av_frame_alloc();
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if (!frame || !sw_frame) {
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ret = AVERROR(ENOMEM);
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goto finish;
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}
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/* actual decoding */
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while (ret >= 0) {
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ret = av_read_frame(input_ctx, &pkt);
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if (ret < 0)
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break;
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if (pkt.stream_index == video_st->index)
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ret = decode_packet(&decode, decoder_ctx, frame, sw_frame, &pkt, output_ctx);
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av_packet_unref(&pkt);
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}
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/* flush the decoder */
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pkt.data = NULL;
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pkt.size = 0;
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ret = decode_packet(&decode, decoder_ctx, frame, sw_frame, &pkt, output_ctx);
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finish:
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if (ret < 0) {
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char buf[1024];
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av_strerror(ret, buf, sizeof(buf));
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fprintf(stderr, "%s\n", buf);
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}
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avformat_close_input(&input_ctx);
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av_frame_free(&frame);
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av_frame_free(&sw_frame);
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avcodec_free_context(&decoder_ctx);
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av_buffer_unref(&decode.hw_device_ref);
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avio_close(output_ctx);
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return ret;
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}
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