问avcodec:无法解码hevc

EN

ffmpeg -y -f lavfi -i testsrc=size=192x108:rate=1:duration=10 -vcodec libx265 -pix_fmt yuv420p input.265

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

//Using extern "C", because the file is built as C++
extern "C" {
#include <libavcodec/avcodec.h>
}

#define INBUF_SIZE 1024

static void pgm_save(unsigned char* buf, int wrap, int xsize, int ysize,
    char* filename)
{
    FILE* f;
    int i;

    f = fopen(filename, "wb");
    fprintf(f, "P5\n%d %d\n%d\n", xsize, ysize, 255);
    for (i = 0; i < ysize; i++)
        fwrite(buf + i * wrap, 1, xsize, f);
    fclose(f);
}

static void decode(AVCodecContext* dec_ctx, AVFrame* frame, AVPacket* pkt,
    const char* filename)
{
    char buf[1024];
    int ret;

    ret = avcodec_send_packet(dec_ctx, pkt);
    if (ret < 0) {
        fprintf(stderr, "Error sending a packet for decoding\n");
        exit(1);
    }

    while (ret >= 0) {
        ret = avcodec_receive_frame(dec_ctx, frame);
        if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
            return;
        else if (ret < 0) {
            fprintf(stderr, "Error during decoding\n");
            exit(1);
        }

        printf("saving frame %3d\n", dec_ctx->frame_number);
        fflush(stdout);

        /* the picture is allocated by the decoder. no need to
           free it */
        snprintf(buf, sizeof(buf), "%s_%03d.pgm", filename, dec_ctx->frame_number);
        pgm_save(frame->data[0], frame->linesize[0],
            frame->width, frame->height, buf);

        //av_frame_unref(frame);    // <--- I think we need it.
    }

    //av_packet_unref(pkt);  // <--- I think we need it.
}

int main(int argc, char** argv)
{
    const char* filename, * outfilename;
    const AVCodec* codec;
    AVCodecParserContext* parser;
    AVCodecContext* c = NULL;
    FILE* f;
    AVFrame* frame;
    uint8_t inbuf[INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
    uint8_t* data;
    size_t   data_size;
    int ret;
    AVPacket* pkt;

    filename = argv[1];
    outfilename = argv[2];

    pkt = av_packet_alloc();
    if (!pkt)
        exit(1);

    //memset(inbuf + INBUF_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
    memset(inbuf, 0, sizeof(inbuf));

    codec = avcodec_find_decoder(AV_CODEC_ID_HEVC);
    if (!codec) {
        fprintf(stderr, "Codec not found\n");
        exit(1);
    }

    parser = av_parser_init(codec->id);
    if (!parser) {
        fprintf(stderr, "parser not found\n");
        exit(1);
    }

    c = avcodec_alloc_context3(codec);
    if (!c) {
        fprintf(stderr, "Could not allocate video codec context\n");
        exit(1);
    }

    if (avcodec_open2(c, codec, NULL) < 0) {
        fprintf(stderr, "Could not open codec\n");
        exit(1);
    }

    f = fopen(filename, "rb");
    if (!f) {
        fprintf(stderr, "Could not open %s\n", filename);
        exit(1);
    }

    frame = av_frame_alloc();
    if (!frame) {
        fprintf(stderr, "Could not allocate video frame\n");
        exit(1);
    }

    while (!feof(f)) {
        /* read raw data from the input file */
        data_size = fread(inbuf, 1, INBUF_SIZE, f);
        if (!data_size)
            break;

        /* use the parser to split the data into frames */
        data = inbuf;
        while (data_size > 0) {
            ret = av_parser_parse2(parser, c, &pkt->data, &pkt->size,
                data, (int)data_size, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
            if (ret < 0) {
                fprintf(stderr, "Error while parsing\n");
                exit(1);
            }
            data += ret;
            data_size -= ret;


            if (pkt->data) {
                printf("NICE\n");
                decode(c, frame, pkt, outfilename);
            }
        }
    }

    /* flush the decoder */
    decode(c, frame, NULL, outfilename);

    fclose(f);

    av_parser_close(parser);
    avcodec_free_context(&c);
    av_frame_free(&frame);
    av_packet_free(&pkt);

    return 0;
}