FFmpeg：播放文件seek功能(附完整源代码)_使用ffmpeg实现seek操作

#include "libavutil/adler32.h"
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libavutil/imgutils.h"

int64_t *pts_array;
uint32_t *crc_array;
int size_of_array;
int number_of_elements;

static int add_crc_to_array(uint32_t crc, int64_t pts)
{
   
    if (size_of_array <= number_of_elements) {
   
        if (size_of_array == 0)
            size_of_array = 10;
        size_of_array *= 2;
        crc_array = av_realloc_f(crc_array, size_of_array, sizeof(uint32_t));
        pts_array = av_realloc_f(pts_array, size_of_array, sizeof(int64_t));
        if ((crc_array == NULL) || (pts_array == NULL)) {
   
            av_log(NULL, AV_LOG_ERROR, "Can't allocate array to store crcs\n");
            return AVERROR(ENOMEM);
        }
    }
    crc_array[number_of_elements] = crc;
    pts_array[number_of_elements] = pts;
    number_of_elements++;
    return 0;
}

static int compare_crc_in_array(uint32_t crc, int64_t pts)
{
   
    int i;
    for (i = 0; i < number_of_elements; i++) {
   
        if (pts_array[i] == pts) {
   
            if (crc_array[i] == crc) {
   
                printf("Comparing 0x%08"PRIx32" %"PRId64" %d is OK\n", crc, pts, i);
                return 0;
            }
            else {
   
                av_log(NULL, AV_LOG_ERROR, "Incorrect crc of a frame after seeking\n");
                return -1;
            }
        }
    }
    av_log(NULL, AV_LOG_ERROR, "Incorrect pts of a frame after seeking\n");
    return -1;
}

static int compute_crc_of_packets(AVFormatContext *fmt_ctx, int video_stream,
                                AVCodecContext *ctx, AVPacket *pkt, AVFrame *fr,
                                uint64_t ts_start, uint64_t ts_end, int no_seeking)
{
   
    int number_of_written_bytes;
    int result;
    int byte_buffer_size;
    uint8_t *byte_buffer;
    uint32_t crc;

    byte_buffer_size = 
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