求助 E0513 不能将 "void *" 类型的值分配到 "AVPacketList *" 类型的实体

#include <assert.h>
#include <stdio.h>
#include <math.h>
#include <SDL.h>

#include <libavutil/log.h>
#include <libavutil/time.h>
#include <libavutil/avstring.h>
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libswscale/swscale.h>
#include <libswresample/swresample.h>

#define SDL_AUDIO_BUFFER_SIZE 1024
#define MAX_AUDIO_FRAME_SIZE 192000

#define AV_SYNC_THRESHOLD 0.01
#define AV_NOSYNC_THRESHOLD 10.0

#define MAX_AUDIOQ_SIZE (5*6*1024)      
#define MAX_VEDIOQ_SIZE (5*256*1024)
#define FF_REFRESH_EVENT (SDL_USEREVENT)
#define FF_QUIT_EVENT (SDL_USEREVENT + 1)

#define VIDEO_PICTURE_QUEUE_SIZE 1

typedef struct PacketQueue {
    AVPacketList* first_pkt, * last_pkt;
    int nb_packets;
    int size;
    SDL_mutex* mutex;
    SDL_cond* cond;
}PacketQueue;

typedef struct VideoPicture {
    AVPicture* pict;   
    int width, height;
    int allocated;        
    double pts;
}VideoPicture;

typedef struct VideoState {
    char filename[1024];
    AVFormatContext* pFormatCtx;
    int videoStream, audioStream;

    AVStream* audio_st;
    AVCodecContext* audio_ctx;
    struct SwrContext* audio_swr_cxt;

    uint8_t audio_buf[(MAX_AUDIO_FRAME_SIZE * 3) / 2];
    unsigned int audio_buf_size;
    unsigned int audio_buf_index;
    PacketQueue audioq;
    AVFrame audio_frame;
    AVPacket audio_pkt;
    uint8_t* audio_pkt_data;
    int audio_pkt_size;

    AVStream* video_st;
    AVCodecContext* video_ctx;
    struct SwsContext* sws_ctx;
    PacketQueue videoq;
    VideoPicture pictq[VIDEO_PICTURE_QUEUE_SIZE];  
    int pictq_size;
    int pictq_rindex;
    int pictq_windex;

    SDL_mutex* pictq_mutex;
    SDL_cond* pictq_cond;
    SDL_Thread* parse_tid;
    SDL_Thread* video_tid;

    double audio_clock;
    double video_clock;

    double frame_timer;
    double frame_last_pts;
    double frame_last_delay;


    int quit;
}VideoState;


SDL_mutex* texture_mutex;

SDL_Window* win;
SDL_Renderer* renderer;
SDL_Texture* texture;

VideoState* global_video_state;

void packet_queue_init(PacketQueue* q) {
    memset(q, 0, sizeof(PacketQueue));
    q->mutex = SDL_CreateMutex();
    q->cond = SDL_CreateCond();
}

int packet_queue_get(PacketQueue* q, AVPacket* pkt, int block) {
    AVPacketList* pktl;
    int ret;

    SDL_LockMutex(q->mutex);
    for (;;) {
        if (global_video_state->quit) {
            fprintf(stderr, "quit from queue_get!\n");
            ret = -1;
            break;
        }

        pktl = q->first_pkt;
        if (pktl) {
            q->first_pkt = pktl->next;
            if (!q->first_pkt)
                q->last_pkt = NULL;
            q->nb_packets--;
            q->size -= pktl->pkt.size;
            *pkt = pktl->pkt;
            av_free(pktl);
            ret = 1;
            break;
        }
        else if (!block) {
            ret = 0;
            break;
        }
        else {
            fprintf(stderr, "queue is empty, so wait a moment and wait a cond signal!\n");
            SDL_CondWait(q->cond, q->mutex);
        }
    }
    SDL_UnlockMutex(q->mutex);
    return ret;
}

int packet_queue_put(PacketQueue* q, AVPacket* pkt) {
    AVPacketList* pktl;

    if (av_dup_packet(pkt) < 0) {
        return -1;
    }

    pktl = av_malloc(sizeof(AVPacketList));
    if (!pktl)
    {
        return -1;
    }

    pktl->pkt = *pkt;
    pktl->next = NULL;

    SDL_LockMutex(q->mutex);
    if (!q->last_pkt)
        q->first_pkt = pktl;
    else
        q->last_pkt->next = pktl;
    q->last_pkt = pktl;
    q->nb_packets++;
    q->size += pktl->pkt.size;

    SDL_CondSignal(q->cond);
    SDL_UnlockMutex(q->mutex);
    return 0;
}

double get_audio_clock(VideoState* is) {
    double pts;
    int hw_buf_size, bytes_per_sec, n;

    pts = is->audio_clock;
    hw_buf_size = is->audio_buf_size - is->audio_buf_index;
    bytes_per_sec = 0;
    n = is->audio_ctx->channels * 2;
    if (is->audio_st) {
        bytes_per_sec = is->audio_ctx->sample_rate * n;
    }
    if (bytes_per_sec) {
        pts -= (double)hw_buf_size / bytes_per_sec;
    }
    return pts;
}

int audio_decode_frame(VideoState* is, uint8_t* audio_buf, int buf_size, double* pts_ptr) {
    int len1, data_size = 0, n;
    AVPacket* pkt = &is->audio_pkt;
    double pts;

    for (;;) {
        while (is->audio_pkt_size > 0) {
            int got_frame = 0;
            len1 = avcodec_decode_audio4(is->audio_ctx, &is->audio_frame, &got_frame, pkt);
            if (len1 < 0) {
                printf("Failed to decode audio...\n");
                is->audio_pkt_size = 0;
                break;
            }

            data_size = 0;
            if (got_frame) {
                data_size = 2 * 2 * is->audio_frame.nb_samples;
                assert(data_size <= buf_size);

                swr_convert(is->audio_swr_cxt,
                    &audio_buf,
                    MAX_AUDIO_FRAME_SIZE * 3 / 2,
                    (const uint8_t**)is->audio_frame.data,
                    is->audio_frame.nb_samples);

                is->audio_pkt_size -= len1;
                is->audio_pkt_data += len1;
            }
            if (data_size == 0)
                continue;
            pts = is->audio_clock;
            *pts_ptr = pts;
            n = 2 * is->audio_ctx->channels;

            is->audio_clock += (double)data_size / (double)(n * is->audio_ctx->sample_rate);   

            return data_size;
        }

        if (pkt->data)
            av_free_packet(pkt);

        if (is->quit) {
            printf("Will quit program...\n");
            return -1;
        }

        if (packet_queue_get(&is->audioq, pkt, 0) <= 0) {
            return -1;
        }

        is->audio_pkt_data = pkt->data;
        is->audio_pkt_size = pkt->size;

        if (pkt->pts != AV_NOPTS_VALUE) {
            is->audio_clock = av_q2d(is->audio_st->time_base) * pkt->pts;
        }
    }
}

void audio_callback(void* userdata, uint8_t* stream, int len) {
    VideoState* is = (VideoState*)userdata;
    int len1, audio_size;
    double pts;
    SDL_memset(stream, 0, len);

    while (len > 0) {
        if (is->audio_buf_index >= is->audio_buf_size) {
            audio_size = audio_decode_frame(is, is->audio_buf, sizeof(is->audio_buf), &pts);
            if (audio_size < 0) {
                is->audio_buf_size = 1024 * 2 * 2;
                printf("--------------no audio packet-------------------\n");
                memset(is->audio_buf, 0, is->audio_buf_size);
            }
            else {
                is->audio_buf_size = audio_size;
            }
            is->audio_buf_index = 0;
        }

        len1 = is->audio_buf_size - is->audio_buf_index;
        if (len1 > len)
            len1 = len;
        //memcpy(stream,(uint8_t*)is->audio_buf+is->audio_buf_index,len1);
        SDL_MixAudio(stream, (uint8_t*)is->audio_buf + is->audio_buf_index, len1, SDL_MIX_MAXVOLUME);
        len -= len1;
        stream += len1;
        is->audio_buf_index += len1;
    }
}


static uint32_t sdl_refresh_timer_cb(uint32_t interval, void* dat) {
    SDL_Event event;

    event.type = FF_REFRESH_EVENT;
    event.user.data1 = dat;
    SDL_PushEvent(&event);
    return 0;
}

static void schedule_refresh(VideoState* is, int delay) {
    SDL_AddTimer(delay, sdl_refresh_timer_cb, is);
}

void video_display(VideoState* is) {
    SDL_Rect rect;
    VideoPicture* vp;

    vp = &is->pictq[is->pictq_rindex];
    if (vp->pict) {
        SDL_UpdateYUVTexture(texture, NULL,
            vp->pict->data[0], vp->pict->linesize[0],
            vp->pict->data[1], vp->pict->linesize[1],
            vp->pict->data[2], vp->pict->linesize[2]);

        rect.x = 0;
        rect.y = 0;
        rect.w = is->video_ctx->width;
        rect.h = is->video_ctx->height;

        SDL_LockMutex(texture_mutex);
        SDL_RenderClear(renderer);
        SDL_RenderCopy(renderer, texture, NULL, &rect);
        SDL_RenderPresent(renderer);
        SDL_UnlockMutex(texture_mutex);
    }
}

void video_refresh_timer(void* userdata) {
    VideoState* is = (VideoState*)userdata;
    VideoPicture* vp;
    /*
    actual_delay：
    delay：
    sync_threshold
    ref_clock：
    diff：
    */
    double actual_delay, delay, sync_threshold, ref_clock, diff;

    if (is->video_st) {
        if (is->pictq_size == 0) {
            schedule_refresh(is, 1);
        }
        else {
            vp = &is->pictq[is->pictq_rindex];

            delay = vp->pts - is->frame_last_pts;
            if (delay <= 0 || delay >= 1.0) {
                delay = is->frame_last_delay;
            }

            is->frame_last_delay = delay;
            is->frame_last_pts = vp->pts;

            ref_clock = get_audio_clock(is);
            diff = vp->pts - ref_clock;

            sync_threshold = (delay > AV_SYNC_THRESHOLD) ? delay : AV_SYNC_THRESHOLD;
            if (fabs(diff) < AV_NOSYNC_THRESHOLD) {
                if (diff <= -sync_threshold) {
                    delay = 0;
                }
                else if (diff >= sync_threshold) {
                    delay *= 2;
                }
            }

            is->frame_timer += delay;
            actual_delay = is->frame_timer - (av_gettime() / 1000000.0);

            if (actual_delay < AV_SYNC_THRESHOLD) {
                actual_delay = AV_SYNC_THRESHOLD;
            }

            schedule_refresh(is, (int)(actual_delay * 1000 + 0.5));
            video_display(is);
            if (++is->pictq_rindex == VIDEO_PICTURE_QUEUE_SIZE) {
                is->pictq_rindex = 0;
            }

            SDL_LockMutex(is->pictq_mutex);
            is->pictq_size--;
            SDL_CondSignal(is->pictq_cond);
            SDL_UnlockMutex(is->pictq_mutex);
        }
    }
    else {
        schedule_refresh(is, 100);
    }
}

void alloc_picture(void* userdata) {
    VideoState* is = (VideoState*)userdata;
    VideoPicture* vp = &is->pictq[is->pictq_windex];

    if (vp->pict) {
        avpicture_free(vp->pict);
        free(vp->pict);
    }

    SDL_LockMutex(texture_mutex);
    vp->pict = (AVPicture*)malloc(sizeof(AVPicture));
    if (vp->pict) {
        avpicture_alloc(vp->pict,
            AV_PIX_FMT_YUV420P,
            is->video_ctx->width,
            is->video_ctx->height);
    }
    SDL_UnlockMutex(texture_mutex);

    vp->width = is->video_ctx->width;
    vp->height = is->video_ctx->height;
    vp->allocated = 1;
}

int queue_picture(VideoState* is, AVFrame* pFrame, double pts) {
    VideoPicture* vp;
    int dst_pix_fmt;
    AVPicture pict;

    SDL_LockMutex(is->pictq_mutex);
    while (is->pictq_size >= VIDEO_PICTURE_QUEUE_SIZE && !is->quit) {
        SDL_CondWait(is->pictq_cond, is->pictq_mutex);
    }
    SDL_UnlockMutex(is->pictq_mutex);

    if (is->quit) {
        printf("quit from queue picture...\n");
        return -1;
    }

    vp = &is->pictq[is->pictq_windex];
    if (!vp->pict ||
        vp->width != is->video_ctx->width ||
        vp->height != is->video_ctx->height) {
        vp->allocated = 0;
        alloc_picture(is);
        if (is->quit) {
            printf("quit from queue picture 2...\n");
            return -1;
        }
    }

    if (vp->pict) {
        vp->pts = pts;

        sws_scale(is->sws_ctx, (uint8_t const* const*)pFrame->data,
            pFrame->linesize, 0, is->video_ctx->height,
            vp->pict->data, vp->pict->linesize);

        if (++is->pictq_windex == VIDEO_PICTURE_QUEUE_SIZE) {
            is->pictq_windex = 0;
        }
        SDL_LockMutex(is->pictq_mutex);
        is->pictq_size++;
        SDL_UnlockMutex(is->pictq_mutex);
    }
    return 0;
}

double synchronize_video(VideoState* is, AVFrame* src_frame, double pts) {
    double frame_delay;

    if (pts != 0) {
        is->video_clock = pts;
    }
    else {
        pts = is->video_clock;
    }

    frame_delay = av_q2d(is->video_ctx->time_base);

    frame_delay += src_frame->repeat_pict * (frame_delay * 0.5);
    is->video_clock += frame_delay;

    return pts;
}

int video_thread(void* arg) {
    VideoState* is = (VideoState*)arg;
    AVPacket packet, * pkt = &packet;
    int frameFinished;
    AVFrame* pFrame;
    double pts;

    pFrame = av_frame_alloc();

    for (;;) {
        if (packet_queue_get(&is->videoq, pkt, 1) < 0) {
            break;
        }

        avcodec_decode_video2(is->video_ctx, pFrame, &frameFinished, pkt);  

        if ((pts = av_frame_get_best_effort_timestamp(pFrame)) == AV_NOPTS_VALUE) {
            pts = 0;
        }
        pts *= av_q2d(is->video_st->time_base);

        if (frameFinished) {
            pts = synchronize_video(is, pFrame, pts);
            if (queue_picture(is, pFrame, pts) < 0) {
                break;
            }
        }

        av_free_packet(pkt);
    }
    av_frame_free(&pFrame);
    return 0;
}

int stream_component_open(VideoState* is, int stream_index) {
    int64_t in_channel_layout, out_channel_layout;
    AVFormatContext* pFormatCtx = is->pFormatCtx;
    AVCodecContext* codecCtx = NULL;
    AVCodec* codec = NULL;
    SDL_AudioSpec new_spec, old_spec;

    codec = avcodec_find_decoder(pFormatCtx->streams[stream_index]->codec->codec_id);
    if (!codec) {
        printf("UnSupport codec!\n");
        return -1;
    }

    codecCtx = avcodec_alloc_context3(codec);
    if (!codecCtx) {
        printf("Failed to alloc codec context\n");
        return -1;
    }

    if (avcodec_copy_context(codecCtx, pFormatCtx->streams[stream_index]->codec) < 0) {
        printf("Failed to copy codec context\n");
        return -1;
    }

    if (codecCtx->codec_type == AVMEDIA_TYPE_AUDIO) {
        new_spec.freq = codecCtx->sample_rate;
        new_spec.format = AUDIO_S16SYS;
        new_spec.channels = codecCtx->channels;
        new_spec.silence = 0;
        new_spec.samples = SDL_AUDIO_BUFFER_SIZE;
        new_spec.callback = audio_callback;
        new_spec.userdata = is;

        if (SDL_OpenAudio(&new_spec, &old_spec) < 0) {
            printf("SDL_OpenAudio: %s\n", SDL_GetError());
            return -1;
        }
    }

    if (avcodec_open2(codecCtx, codec, NULL) < 0) {
        printf("Failed to open codec\n");
        return -1;
    }

    switch (codecCtx->codec_type) {
    case AVMEDIA_TYPE_AUDIO:
        is->audioStream = stream_index;
        is->audio_st = pFormatCtx->streams[stream_index];
        is->audio_ctx = codecCtx;
        is->audio_buf_size = 0;
        is->audio_buf_index = 0;

        memset(&is->audio_pkt, 0, sizeof(is->audio_pkt));
        packet_queue_init(&is->audioq);

        SDL_PauseAudio(0);

        in_channel_layout = av_get_default_channel_layout(is->audio_ctx->channels);
        out_channel_layout = in_channel_layout;

        is->audio_swr_cxt = swr_alloc();
        swr_alloc_set_opts(is->audio_swr_cxt,
            out_channel_layout,
            AV_SAMPLE_FMT_S16,
            is->audio_ctx->sample_rate,
            in_channel_layout,
            is->audio_ctx->sample_fmt,
            is->audio_ctx->sample_rate,
            0,
            NULL);

        swr_init(is->audio_swr_cxt);
        break;
    case AVMEDIA_TYPE_VIDEO:
        is->videoStream = stream_index;
        is->video_st = pFormatCtx->streams[stream_index];
        is->video_ctx = codecCtx;

        is->frame_timer = (double)av_gettime() / 1000000.0;
        is->frame_last_delay = 40e-3;

        packet_queue_init(&is->videoq);
        is->sws_ctx = sws_getContext(is->video_ctx->width,
            is->video_ctx->height,
            is->video_ctx->pix_fmt,
            is->video_ctx->width,
            is->video_ctx->height,
            AV_PIX_FMT_YUV420P,
            SWS_BILINEAR,
            NULL, NULL, NULL);
        is->video_tid = SDL_CreateThread(video_thread, "video_thread", is);
        break;
    default:
        break;
    }
    return 0;
}

int decode_thread(void* arg) {
    VideoState* is = (VideoState*)arg;
    AVFormatContext* pFormatCtx = NULL;
    AVPacket packet, * ptk = &packet;
    SDL_Event event;

    int i, ret = 0;
    int video_index = -1;
    int audio_index = -1;

    is->videoStream = -1;
    is->audioStream = -1;

    global_video_state = is;

    if (avformat_open_input(&pFormatCtx, is->filename, NULL, NULL) < 0) {
        printf("Failed to open file[%s] context\n", is->filename);
        return -1;
    }

    is->pFormatCtx = pFormatCtx;

    if (avformat_find_stream_info(pFormatCtx, NULL) < 0) {
        printf("Failed to get detail stream infomation\n");
        return -1;
    }

    for (i = 0; i < pFormatCtx->nb_streams; i++) {
        if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO && video_index < 0)
            video_index = i;
        if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO && audio_index < 0)
            audio_index = i;
    }

    if (video_index < 0 || audio_index < 0) {
        printf("Failed to find stream index for audio/video\n");
        return -1;
    }

    av_dump_format(pFormatCtx, audio_index, is->filename, 0);
    av_dump_format(pFormatCtx, video_index, is->filename, 0);

    ret = stream_component_open(is, audio_index);
    if (ret < 0) {
        printf("Failed to initialize audio data\n");
        goto fail;
    }
    ret = stream_component_open(is, video_index);
    if (ret < 0) {
        printf("Failed to initialize video data\n");
        goto fail;
    }

    win = SDL_CreateWindow("Media Player",
        SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
        is->video_ctx->width, is->video_ctx->height,
        SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE
    );

    renderer = SDL_CreateRenderer(win, -1, 0);

    texture = SDL_CreateTexture(renderer,
        SDL_PIXELFORMAT_IYUV,
        SDL_TEXTUREACCESS_STREAMING,
        is->video_ctx->width,
        is->video_ctx->height);

    for (;;) {
        if (is->quit) {
            SDL_CondSignal(is->videoq.cond);
            SDL_CondSignal(is->audioq.cond);
            break;
        }

        if (is->audioq.size > MAX_AUDIOQ_SIZE ||
            is->videoq.size > MAX_VEDIOQ_SIZE) {
            SDL_Delay(10);
            continue;
        }

        if (av_read_frame(is->pFormatCtx, ptk) < 0) {
            if (is->pFormatCtx->pb->error == 0) {
                SDL_Delay(100);
                continue;
            }
            else {
                break;
            }
        }
        if (ptk->stream_index == is->videoStream) {
            packet_queue_put(&is->videoq, ptk);
            printf("put video queue, size:%d\n", is->videoq.nb_packets);
        }
        else if (ptk->stream_index == is->audioStream) {
            packet_queue_put(&is->audioq, ptk);
            printf("put audio queue, size:%d\n", is->audioq.nb_packets);
        }
        else {
            av_free_packet(ptk);
        }
    }

    while (!is->quit) {
        SDL_Delay(100);
    }

fail:
    event.type = FF_QUIT_EVENT;
    event.user.data1 = is;
    SDL_PushEvent(&event);

    return 0;
}

int main(int argc, char* argv[]) {
    int ret = -1;

    SDL_Event event;
    VideoState* is;

    if (argc < 2) {
        fprintf(stderr, "Usage: test <file>\n");
        return ret;
    }

    is = av_malloc(sizeof(VideoState));

    av_register_all();
    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {
        printf("Failed to initialize SDL - %s\n", SDL_GetError());
        return ret;
    }
    texture_mutex = SDL_CreateMutex();

    av_strlcpy(is->filename, argv[1], sizeof(is->filename));

    is->pictq_mutex = SDL_CreateMutex();
    is->pictq_cond = SDL_CreateCond();

    schedule_refresh(is, 40);   
    is->parse_tid = SDL_CreateThread(decode_thread, "decode_thread", is);
    if (!is->parse_tid) {
        av_free(is);
        goto __FAIL;
    }

    for (;;) {
        SDL_WaitEvent(&event);
        switch (event.type) {
        case FF_QUIT_EVENT:
        case SDL_QUIT:
            printf("receive a QUIT event:%d\n", event.type);
            is->quit = 1;
            goto __QUIT;
            break;
        case FF_REFRESH_EVENT:
            video_refresh_timer(event.user.data1);
            break;
        default:
            break;
        }
    }

__QUIT:
    ret = 0;

__FAIL:
    SDL_Quit();
    return ret;
}