early-access version 1432
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pineappleEA
252
externals/ffmpeg/doc/examples/hw_decode.c
vendored
Executable file
252
externals/ffmpeg/doc/examples/hw_decode.c
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/*
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* Copyright (c) 2017 Jun Zhao
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* Copyright (c) 2017 Kaixuan Liu
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*
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* HW Acceleration API (video decoding) decode sample
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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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* HW-Accelerated decoding example.
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*
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* @example hw_decode.c
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* This example shows how to do HW-accelerated decoding with output
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* frames from the HW video surfaces.
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*/
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#include <stdio.h>
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#include <libavcodec/avcodec.h>
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#include <libavformat/avformat.h>
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#include <libavutil/pixdesc.h>
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#include <libavutil/hwcontext.h>
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#include <libavutil/opt.h>
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#include <libavutil/avassert.h>
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#include <libavutil/imgutils.h>
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static AVBufferRef *hw_device_ctx = NULL;
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static enum AVPixelFormat hw_pix_fmt;
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static FILE *output_file = NULL;
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static int hw_decoder_init(AVCodecContext *ctx, const enum AVHWDeviceType type)
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{
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int err = 0;
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if ((err = av_hwdevice_ctx_create(&hw_device_ctx, type,
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NULL, NULL, 0)) < 0) {
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fprintf(stderr, "Failed to create specified HW device.\n");
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return err;
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}
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ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx);
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return err;
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}
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static enum AVPixelFormat get_hw_format(AVCodecContext *ctx,
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const enum AVPixelFormat *pix_fmts)
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{
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const enum AVPixelFormat *p;
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for (p = pix_fmts; *p != -1; p++) {
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if (*p == hw_pix_fmt)
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return *p;
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}
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fprintf(stderr, "Failed to get HW surface format.\n");
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return AV_PIX_FMT_NONE;
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}
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static int decode_write(AVCodecContext *avctx, AVPacket *packet)
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{
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AVFrame *frame = NULL, *sw_frame = NULL;
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AVFrame *tmp_frame = NULL;
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uint8_t *buffer = NULL;
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int size;
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int ret = 0;
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ret = avcodec_send_packet(avctx, packet);
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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 (1) {
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if (!(frame = av_frame_alloc()) || !(sw_frame = av_frame_alloc())) {
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fprintf(stderr, "Can not alloc frame\n");
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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ret = avcodec_receive_frame(avctx, frame);
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if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
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av_frame_free(&frame);
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av_frame_free(&sw_frame);
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return 0;
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} else if (ret < 0) {
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fprintf(stderr, "Error while decoding\n");
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goto fail;
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}
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if (frame->format == hw_pix_fmt) {
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/* retrieve data from GPU to CPU */
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if ((ret = av_hwframe_transfer_data(sw_frame, frame, 0)) < 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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tmp_frame = sw_frame;
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} else
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tmp_frame = frame;
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size = av_image_get_buffer_size(tmp_frame->format, tmp_frame->width,
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tmp_frame->height, 1);
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buffer = av_malloc(size);
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if (!buffer) {
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fprintf(stderr, "Can not alloc buffer\n");
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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ret = av_image_copy_to_buffer(buffer, size,
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(const uint8_t * const *)tmp_frame->data,
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(const int *)tmp_frame->linesize, tmp_frame->format,
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tmp_frame->width, tmp_frame->height, 1);
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if (ret < 0) {
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fprintf(stderr, "Can not copy image to buffer\n");
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goto fail;
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}
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if ((ret = fwrite(buffer, 1, size, output_file)) < 0) {
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fprintf(stderr, "Failed to dump raw data.\n");
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goto fail;
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}
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fail:
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av_frame_free(&frame);
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av_frame_free(&sw_frame);
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av_freep(&buffer);
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if (ret < 0)
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return ret;
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}
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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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int video_stream, ret;
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AVStream *video = NULL;
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AVCodecContext *decoder_ctx = NULL;
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AVCodec *decoder = NULL;
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AVPacket packet;
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enum AVHWDeviceType type;
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int i;
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if (argc < 4) {
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fprintf(stderr, "Usage: %s <device type> <input file> <output file>\n", argv[0]);
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return -1;
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}
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type = av_hwdevice_find_type_by_name(argv[1]);
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if (type == AV_HWDEVICE_TYPE_NONE) {
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fprintf(stderr, "Device type %s is not supported.\n", argv[1]);
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fprintf(stderr, "Available device types:");
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while((type = av_hwdevice_iterate_types(type)) != AV_HWDEVICE_TYPE_NONE)
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fprintf(stderr, " %s", av_hwdevice_get_type_name(type));
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fprintf(stderr, "\n");
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return -1;
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}
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/* open the input file */
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if (avformat_open_input(&input_ctx, argv[2], NULL, NULL) != 0) {
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fprintf(stderr, "Cannot open input file '%s'\n", argv[2]);
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return -1;
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}
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if (avformat_find_stream_info(input_ctx, NULL) < 0) {
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fprintf(stderr, "Cannot find input stream information.\n");
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return -1;
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}
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/* find the video stream information */
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ret = av_find_best_stream(input_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0);
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if (ret < 0) {
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fprintf(stderr, "Cannot find a video stream in the input file\n");
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return -1;
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}
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video_stream = ret;
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for (i = 0;; i++) {
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const AVCodecHWConfig *config = avcodec_get_hw_config(decoder, i);
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if (!config) {
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fprintf(stderr, "Decoder %s does not support device type %s.\n",
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decoder->name, av_hwdevice_get_type_name(type));
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return -1;
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}
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if (config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX &&
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config->device_type == type) {
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hw_pix_fmt = config->pix_fmt;
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break;
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}
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}
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if (!(decoder_ctx = avcodec_alloc_context3(decoder)))
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return AVERROR(ENOMEM);
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video = input_ctx->streams[video_stream];
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if (avcodec_parameters_to_context(decoder_ctx, video->codecpar) < 0)
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return -1;
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decoder_ctx->get_format = get_hw_format;
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if (hw_decoder_init(decoder_ctx, type) < 0)
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return -1;
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if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0) {
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fprintf(stderr, "Failed to open codec for stream #%u\n", video_stream);
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return -1;
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}
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/* open the file to dump raw data */
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output_file = fopen(argv[3], "w+");
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/* actual decoding and dump the raw data */
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while (ret >= 0) {
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if ((ret = av_read_frame(input_ctx, &packet)) < 0)
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break;
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if (video_stream == packet.stream_index)
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ret = decode_write(decoder_ctx, &packet);
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av_packet_unref(&packet);
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}
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/* flush the decoder */
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packet.data = NULL;
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packet.size = 0;
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ret = decode_write(decoder_ctx, &packet);
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av_packet_unref(&packet);
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if (output_file)
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fclose(output_file);
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avcodec_free_context(&decoder_ctx);
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avformat_close_input(&input_ctx);
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av_buffer_unref(&hw_device_ctx);
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return 0;
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}
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