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  • Simple FFMpeg player for Android

    23 janvier 2017, par don11995

    I have a problem with the output of AVFrame (AVPicture) into the ANativeWindow. I wrote simpe test code :

    void *Player::readThread(void * reserved) {
    
    ALOGD("Read thread started!");
    
    VideoState *state =  (VideoState *) reserved;
    

    
    int err = 0;
    
    int ret;
    
    int i;
    
    AVFormatContext *formatContext = NULL;
    
    AVCodecContext *codecContext = NULL;
    
    AVCodecParameters *codecParams = NULL;
    
    AVCodecID codecID = AV_CODEC_ID_NONE;
    
    AVCodec *decoder = NULL;
    
    AVFrame *frame = NULL;
    
    AVFrame *frameRGBA = NULL;
    
    AVPacket packet;
    
    struct SwsContext *img2RGBAContext;
    
    ANativeWindow_Buffer windowBuffer;
    
    uint8_t *RGBABuffer = NULL;
    
    int RGBABufferSize = 0;
    
    int got = 0;
    
    int windowWidth = 640;
    
    int windowHeight = 480;
    

    
    const char *url = state->url.c_str();
    
    if (url == NULL || strlen(url) <= 0) {
    
        err = ERROR_UNKNOWN_URI;
    
        goto exit;
    
    }
    
    ALOGD("URL to play: %s", url);
    

    
    state->isPlaying = true;
    

    
    formatContext = avformat_alloc_context();
    
    if (formatContext == NULL) {
    
        err = ERROR_OUT_OF_MEMORY;
    
        goto exit;
    
    }
    
    ALOGD("formatContext allocated");
    

    
    frame = av_frame_alloc();
    
    if (frame == NULL) {
    
        err = ERROR_OUT_OF_MEMORY;
    
        goto exit;
    
    }
    
    ALOGD("frame allocated");
    

    
    frameRGBA = av_frame_alloc();
    
    if (frameRGBA == NULL) {
    
        err = ERROR_OUT_OF_MEMORY;
    
        goto exit;
    
    }
    
    ALOGD("frameRGBA allocated");
    

    
    ret = avformat_open_input(&formatContext, url, NULL, NULL);
    
    if (ret != 0) {
    
        err = ERROR_CAN_NOT_OPEN_URI;
    
        goto exit;
    
    }
    
    ALOGD("formatContext opened");
    

    
    ret = avformat_find_stream_info(formatContext, NULL);
    
    if (ret != 0) {
    
        err = ERROR_CAN_NOT_FIND_STREAM_INFO;
    
        goto exit;
    
    }
    
    ALOGD("file info found");
    

    
    for (i = 0; i < formatContext->nb_streams; i++) {
    
        AVStream *stream = formatContext->streams[i];
    
        AVCodecParameters *codecParams = stream->codecpar;
    
        AVCodecID codecID = codecParams->codec_id;
    
        AVMediaType type = codecParams->codec_type;
    
        const char *codecName = avcodec_get_name(codecID);
    
        switch (type) {
    
            case AVMEDIA_TYPE_AUDIO:
    
                ALOGD("Stream [%d]: type=AUDIO codecName=%s",i,codecName);
    
                break;
    
            case AVMEDIA_TYPE_VIDEO:
    
                ALOGD("Stream [%d]: type=VIDEO codecName=%s",i,codecName);
    
                if (state->video_stream == -1) {
    
                    state->video_stream = i;
    
                }
    
                break;
    
            case AVMEDIA_TYPE_SUBTITLE:
    
                ALOGD("Stream [%d]: type=SUBTITLE codecName=%s",i,codecName);
    
                break;
    
            default:
    
                ALOGD("Stream [%d]: type=UNKNOWN codecName=%s",i,codecName);
    
                break;
    
        }
    
    }
    

    
    if (state->video_stream == -1) {
    
        err = ERROR_CAN_NOT_FIND_ANY_STREAM;
    
        goto exit;
    
    }
    
    ALOGD("Video stream index: %d",state->video_stream);
    

    
    codecParams = formatContext->streams[state->video_stream]->codecpar;
    
    codecID = codecParams->codec_id;
    
    if (codecID == AV_CODEC_ID_NONE) {
    
        err = ERROR_UNKNOWN_CODEC;
    
        goto exit;
    
    }
    
    ALOGD("Codec found");
    

    
    decoder = avcodec_find_decoder(codecID);
    
    if (decoder == NULL) {
    
        err = ERROR_CAN_NOT_FIND_DECODER;
    
        goto exit;
    
    }
    
    ALOGD("Decoder found");
    

    
    codecContext = avcodec_alloc_context3(decoder);
    
    if (codecContext == NULL) {
    
        err = ERROR_OUT_OF_MEMORY;
    
        goto exit;
    
    }
    
    ALOGD("codecContext created");
    

    
    ret = avcodec_parameters_to_context(codecContext, codecParams);
    
    if (ret < 0) {
    
        err = ERROR_CAN_NOT_START_DECODER;
    
        goto exit;
    
    }
    
    ALOGD("codecContext params was set");
    

    
    ret = avcodec_open2(codecContext, decoder, NULL);
    
    if (ret != 0) {
    
        err = ERROR_CAN_NOT_START_DECODER;
    
        goto exit;
    
    }
    
    ALOGD("Decoder opened");
    

    
    if (state->window != NULL) {
    
        ANativeWindow_setBuffersGeometry(state->window, codecParams->width, codecParams->height, WINDOW_FORMAT_RGB_565);
    
        ALOGD("Window geometry changed");
    
    }
    

    
    if (codecParams->width>0 && codecParams->height>0) {
    
        ALOGD("Video width: %d\nVideo height: %d",codecParams->width, codecParams->height);
    
        img2RGBAContext = sws_getCachedContext(
    
            NULL,
    
            codecParams->width,
    
            codecParams->height,
    
            (AVPixelFormat)codecParams->format,
    
            codecParams->width,
    
            codecParams->height,
    
            AV_PIX_FMT_RGB565,
    
            SWS_BICUBIC,
    
            NULL,
    
            NULL,
    
            NULL);
    
        if (img2RGBAContext == NULL) {
    
            err = ERROR_OUT_OF_MEMORY;
    
            goto exit;
    
        }
    
    } else {
    
        err = ERROR_CAN_NOT_START_DECODER;
    
        goto exit;
    
    }
    
    ALOGD("img2RGBAContext created");
    

    
    RGBABufferSize = av_image_get_buffer_size(AV_PIX_FMT_RGB565, codecParams->width, codecParams->height, 1);
    
    RGBABuffer = (uint8_t *)malloc(RGBABufferSize*sizeof(uint8_t));
    
    if (RGBABuffer == NULL) {
    
        err = ERROR_OUT_OF_MEMORY;
    
        goto exit;
    
    }
    
    ALOGD("frameRGBABuffer size %d bytes",RGBABufferSize);
    

    
    ret = av_image_alloc(frameRGBA->data, frameRGBA->linesize, codecParams->width, codecParams->height, AV_PIX_FMT_RGB565, 1);
    
    if (ret < 0) {
    
        err = ERROR_OUT_OF_MEMORY;
    
        goto exit;
    
    }
    

    
    while (av_read_frame(formatContext, &packet) >= 0 && state->isPlaying) {
    
        if (packet.stream_index != state->video_stream) {
    
            ALOGD("Packet is not a video packet. Discard.");
    
            av_packet_unref(&packet);
    
            continue;
    
        }
    
        ret = avcodec_send_packet(codecContext, &packet);
    
        if (ret != 0) {
    
            ALOGE("Can not send packet to decode");
    
            av_packet_unref(&packet);
    
            continue;
    
        }
    
        ret = avcodec_receive_frame(codecContext, frame);
    
        if (ret != 0) {
    
            ALOGE("Can not receive decoded frame yet");
    
            av_packet_unref(&packet);
    
            continue;
    
        }
    
        ALOGD("Converting image to RGB565...");
    
        sws_scale(img2RGBAContext, frame->data, frame->linesize, 0, codecParams->height, frameRGBA->data, frameRGBA->linesize);
    
        ALOGD("Image converted to RGB565");
    
        av_image_copy_to_buffer(RGBABuffer,
    
            RGBABufferSize,
    
            frameRGBA->data,
    
            frameRGBA->linesize,
    
            AV_PIX_FMT_RGB565,
    
            codecParams->width,
    
            codecParams->height,
    
            1);
    
        ALOGD("Image wrote into frameRGBABuffer");
    
        if (ANativeWindow_lock(state->window, &windowBuffer, NULL) == 0) {
    
            ALOGD("Writing %d bytes to windowBuffer", RGBABufferSize);
    
            memcpy(windowBuffer.bits, RGBABuffer, RGBABufferSize);
    
            ANativeWindow_unlockAndPost(state->window);
    
            ALOGD("Image displayed");
    
        } else {
    
            ALOGE("Can not display frame");
    
        }
    
        av_packet_unref(&packet);
    
    }
    

    
    exit:
    
    ALOGD("Releasing resources...");
    
    if (err!=0) {
    
        state->isPlaying = false;
    
        #if !LOG_NDEBUG
    
            switch (err) {
    
                case  ERROR_OUT_OF_MEMORY:
    
                    ALOGE("Out of memory!");
    
                    break;
    
                case  ERROR_CAN_NOT_OPEN_URI:
    
                    ALOGE("Can not open URI: %s", url);
    
                    break;
    
                case  ERROR_UNKNOWN_URI:
    
                    ALOGE("Unknown URI to open!");
    
                    break;
    
                default:
    
                    ALOGE("Unknown error");
    
                    break;
    
            }
    
        #endif
    
        // TODO: send error to listener
    
    }
    
    sws_freeContext(img2RGBAContext);
    
    free(RGBABuffer);
    
    av_free(frame);
    
    av_freep(&frameRGBA->data[0]);
    
    av_packet_unref(&packet);
    
    avcodec_close(codecContext);
    
    avformat_close_input(&formatContext);
    
    avformat_free_context(formatContext);
    
    ALOGD("Read thread closed!");
    
}

    I faced with the next problem in some videos :
    enter image description here
    For example, this video gives me next logs :

    10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: Read thread started!
    
10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: URL to play: http://www.ex.ua/load/280797285
    
10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: formatContext allocated
    
10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: frame allocated
    
10-23 14:53:42.212 26970-4527/com.don.ffmpegplayer D/Player: frameRGBA allocated
    
10-23 14:53:42.846 26970-4527/com.don.ffmpegplayer D/Player: formatContext opened
    
10-23 14:53:42.879 26970-4527/com.don.ffmpegplayer D/Player: file info found
    
10-23 14:53:42.879 26970-4527/com.don.ffmpegplayer D/Player: Stream [0]: type=VIDEO codecName=h264
    
10-23 14:53:42.879 26970-4527/com.don.ffmpegplayer D/Player: Stream [1]: type=AUDIO codecName=ac3
    
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Stream [2]: type=AUDIO codecName=ac3
    
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Stream [3]: type=AUDIO codecName=ac3
    
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Stream [4]: type=SUBTITLE codecName=subrip
    
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Video stream index: 0
    
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Codec found
    
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Decoder found
    
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: codecContext created
    
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: codecContext params was set
    
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Decoder opened
    
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Window geometry changed
    
10-23 14:53:42.880 26970-4527/com.don.ffmpegplayer D/Player: Video width: 1024
    
                                                             Video height: 424
    
10-23 14:53:42.882 26970-4527/com.don.ffmpegplayer D/Player: img2RGBAContext created
    
10-23 14:53:42.882 26970-4527/com.don.ffmpegplayer D/Player: frameRGBABuffer size 868352 bytes
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer E/Player: Can not receive decoded frame yet
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.889 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.890 26970-4527/com.don.ffmpegplayer D/Player: Packet is not a video packet. Discard.
    
10-23 14:53:42.899 26970-4527/com.don.ffmpegplayer E/Player: Can not receive decoded frame yet
    
10-23 14:53:42.905 26970-4527/com.don.ffmpegplayer D/Player: Converting image to RGB565...
    
10-23 14:53:42.918 26970-4527/com.don.ffmpegplayer D/Player: Image converted to RGB565
    
10-23 14:53:42.919 26970-4527/com.don.ffmpegplayer D/Player: Image wrote into frameRGBABuffer
    
10-23 14:53:42.920 26970-4527/com.don.ffmpegplayer D/Player: Writing 868352 bytes to windowBuffer
    
10-23 14:53:42.921 26970-4527/com.don.ffmpegplayer D/Player: Image displayed
    
10-23 14:53:42.926 26970-4527/com.don.ffmpegplayer D/Player: Converting image to RGB565...
    
10-23 14:53:42.934 26970-4527/com.don.ffmpegplayer D/Player: Image converted to RGB565
    
10-23 14:53:42.935 26970-4527/com.don.ffmpegplayer D/Player: Image wrote into frameRGBABuffer
    
10-23 14:53:42.936 26970-4527/com.don.ffmpegplayer D/Player: Writing 868352 bytes to windowBuffer
    
10-23 14:53:42.937 26970-4527/com.don.ffmpegplayer D/Player: Image displayed

    What am I doing wrong ? If I understood correctly, I need to follow next steps :

    1. Get decoded AVFrame from decoder
    2. Convert AVFrame data to RGB565 or RGB8888
    3. Get pixel data from converted frame
    4. Write it to native window

    But in this code two points confuse me : is ANative_setBuffersGeometry called correctly and why frameRGBABuffer size is 868352 bytes ? If video size is 1024*424 frameRGBABuffer size must be width*height*4, isn’t it ? If I change frameRGBABuffer size to width*height*4 program carashes after first image diplayed. I pass video dimmensions to ANative_setBuffersGeometry.

    For any help thanks in anvance.

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