init

opencv-motion-detect/demuxing_decoding.c

+/*
+ * Copyright (c) 2017 Jun Zhao
+ * Copyright (c) 2017 Kaixuan Liu
+ *
+ * HW Acceleration API (video decoding) decode sample
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+ * @file
+ * HW-Accelerated decoding example.
+ *
+ * @example hw_decode.c
+ * This example shows how to do HW-accelerated decoding with output
+ * frames from the HW video surfaces.
+ */
+
+#include <stdio.h>
+#include <libavcodec/avcodec.h>
+#include <libavformat/avformat.h>
+#include <libavutil/pixdesc.h>
+#include <libavutil/hwcontext.h>
+#include <libavutil/opt.h>
+#include <libavutil/avassert.h>
+#include <libavutil/imgutils.h>
+
+static AVBufferRef *hw_device_ctx = NULL;
+static enum AVPixelFormat hw_pix_fmt;
+static FILE *output_file = NULL;
+
+static int hw_decoder_init(AVCodecContext *ctx, const enum AVHWDeviceType type)
+{
+    int err = 0;
+
+    if ((err = av_hwdevice_ctx_create(&hw_device_ctx, type,
+                                      NULL, NULL, 0)) < 0) {
+        fprintf(stderr, "Failed to create specified HW device.\n");
+        return err;
+    }
+    ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx);
+
+    return err;
+}
+
+static enum AVPixelFormat get_hw_format(AVCodecContext *ctx,
+                                        const enum AVPixelFormat *pix_fmts)
+{
+    const enum AVPixelFormat *p;
+
+    for (p = pix_fmts; *p != -1; p++) {
+        if (*p == hw_pix_fmt)
+            return *p;
+    }
+
+    fprintf(stderr, "Failed to get HW surface format.\n");
+    return AV_PIX_FMT_NONE;
+}
+
+static int decode_write(AVCodecContext *avctx, AVPacket *packet)
+{
+    AVFrame *frame = NULL, *sw_frame = NULL;
+    AVFrame *tmp_frame = NULL;
+    uint8_t *buffer = NULL;
+    int size;
+    int ret = 0;
+
+    ret = avcodec_send_packet(avctx, packet);
+    if (ret < 0) {
+        fprintf(stderr, "Error during decoding\n");
+        return ret;
+    }
+
+    while (1) {
+        if (!(frame = av_frame_alloc()) || !(sw_frame = av_frame_alloc())) {
+            fprintf(stderr, "Can not alloc frame\n");
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+
+        ret = avcodec_receive_frame(avctx, frame);
+        if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
+            av_frame_free(&frame);
+            av_frame_free(&sw_frame);
+            return 0;
+        } else if (ret < 0) {
+            fprintf(stderr, "Error while decoding\n");
+            goto fail;
+        }
+
+        if (frame->format == hw_pix_fmt) {
+            /* retrieve data from GPU to CPU */
+            if ((ret = av_hwframe_transfer_data(sw_frame, frame, 0)) < 0) {
+                fprintf(stderr, "Error transferring the data to system memory\n");
+                goto fail;
+            }
+            tmp_frame = sw_frame;
+        } else
+            tmp_frame = frame;
+
+        size = av_image_get_buffer_size(tmp_frame->format, tmp_frame->width,
+                                        tmp_frame->height, 1);
+        buffer = av_malloc(size);
+        if (!buffer) {
+            fprintf(stderr, "Can not alloc buffer\n");
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+        ret = av_image_copy_to_buffer(buffer, size,
+                                      (const uint8_t * const *)tmp_frame->data,
+                                      (const int *)tmp_frame->linesize, tmp_frame->format,
+                                      tmp_frame->width, tmp_frame->height, 1);
+        if (ret < 0) {
+            fprintf(stderr, "Can not copy image to buffer\n");
+            goto fail;
+        }
+
+        if ((ret = fwrite(buffer, 1, size, output_file)) < 0) {
+            fprintf(stderr, "Failed to dump raw data.\n");
+            goto fail;
+        }
+
+    fail:
+        av_frame_free(&frame);
+        av_frame_free(&sw_frame);
+        av_freep(&buffer);
+        if (ret < 0)
+            return ret;
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    AVFormatContext *input_ctx = NULL;
+    int video_stream, ret;
+    AVStream *video = NULL;
+    AVCodecContext *decoder_ctx = NULL;
+    AVCodec *decoder = NULL;
+    AVPacket packet;
+    enum AVHWDeviceType type;
+    int i;
+
+    if (argc < 4) {
+        fprintf(stderr, "Usage: %s <device type> <input file> <output file>\n", argv[0]);
+        return -1;
+    }
+
+    type = av_hwdevice_find_type_by_name(argv[1]);
+    if (type == AV_HWDEVICE_TYPE_NONE) {
+        fprintf(stderr, "Device type %s is not supported.\n", argv[1]);
+        fprintf(stderr, "Available device types:");
+        while((type = av_hwdevice_iterate_types(type)) != AV_HWDEVICE_TYPE_NONE)
+            fprintf(stderr, " %s", av_hwdevice_get_type_name(type));
+        fprintf(stderr, "\n");
+        return -1;
+    }
+
+    /* open the input file */
+    if (avformat_open_input(&input_ctx, argv[2], NULL, NULL) != 0) {
+        fprintf(stderr, "Cannot open input file '%s'\n", argv[2]);
+        return -1;
+    }
+
+    if (avformat_find_stream_info(input_ctx, NULL) < 0) {
+        fprintf(stderr, "Cannot find input stream information.\n");
+        return -1;
+    }
+
+    /* find the video stream information */
+    ret = av_find_best_stream(input_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0);
+    if (ret < 0) {
+        fprintf(stderr, "Cannot find a video stream in the input file\n");
+        return -1;
+    }
+    video_stream = ret;
+
+    for (i = 0;; i++) {
+        const AVCodecHWConfig *config = avcodec_get_hw_config(decoder, i);
+        if (!config) {
+            fprintf(stderr, "Decoder %s does not support device type %s.\n",
+                    decoder->name, av_hwdevice_get_type_name(type));
+            return -1;
+        }
+        if (config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX &&
+            config->device_type == type) {
+            hw_pix_fmt = config->pix_fmt;
+            break;
+        }
+    }
+
+    if (!(decoder_ctx = avcodec_alloc_context3(decoder)))
+        return AVERROR(ENOMEM);
+
+    video = input_ctx->streams[video_stream];
+    if (avcodec_parameters_to_context(decoder_ctx, video->codecpar) < 0)
+        return -1;
+
+    decoder_ctx->get_format  = get_hw_format;
+
+    if (hw_decoder_init(decoder_ctx, type) < 0)
+        return -1;
+
+    if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0) {
+        fprintf(stderr, "Failed to open codec for stream #%u\n", video_stream);
+        return -1;
+    }
+
+    /* open the file to dump raw data */
+    output_file = fopen(argv[3], "w+");
+
+    /* actual decoding and dump the raw data */
+    while (ret >= 0) {
+        if ((ret = av_read_frame(input_ctx, &packet)) < 0)
+            break;
+
+        if (video_stream == packet.stream_index)
+            ret = decode_write(decoder_ctx, &packet);
+
+        av_packet_unref(&packet);
+    }
+
+    /* flush the decoder */
+    packet.data = NULL;
+    packet.size = 0;
+    ret = decode_write(decoder_ctx, &packet);
+    av_packet_unref(&packet);
+
+    if (output_file)
+        fclose(output_file);
+    avcodec_free_context(&decoder_ctx);
+    avformat_close_input(&input_ctx);
+    av_buffer_unref(&hw_device_ctx);
+
+    return 0;
+}
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