790f793844
There are lots of files that don't need it: The number of object files that actually need it went down from 2011 to 884 here. Keep it for external users in order to not cause breakages. Also improve the other headers a bit while just at it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
257 lines
7.9 KiB
C
257 lines
7.9 KiB
C
/*
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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 HW-accelerated decoding API usage.example
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* @example hw_decode.c
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*
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* Perform HW-accelerated decoding with output frames from HW video
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* 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/mem.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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const AVCodec *decoder = NULL;
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AVPacket *packet = NULL;
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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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packet = av_packet_alloc();
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if (!packet) {
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fprintf(stderr, "Failed to allocate AVPacket\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+b");
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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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ret = decode_write(decoder_ctx, NULL);
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if (output_file)
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fclose(output_file);
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av_packet_free(&packet);
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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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