utils.c

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static AVClass av_codec_context_class = { "AVCodecContext", context_to_name, options };

void avcodec_get_context_defaults2(AVCodecContext *s, enum CodecType codec_type){
    int flags=0;
    memset(s, 0, sizeof(AVCodecContext));

    s->av_class= &av_codec_context_class;

    s->codec_type = codec_type;
    if(codec_type == CODEC_TYPE_AUDIO)
        flags= AV_OPT_FLAG_AUDIO_PARAM;
    else if(codec_type == CODEC_TYPE_VIDEO)
        flags= AV_OPT_FLAG_VIDEO_PARAM;
    else if(codec_type == CODEC_TYPE_SUBTITLE)
        flags= AV_OPT_FLAG_SUBTITLE_PARAM;
    av_opt_set_defaults2(s, flags, flags);

    s->rc_eq= "tex^qComp";
    s->time_base= (AVRational){0,1};
    s->get_buffer= avcodec_default_get_buffer;
    s->release_buffer= avcodec_default_release_buffer;
    s->get_format= avcodec_default_get_format;
    s->execute= avcodec_default_execute;
    s->sample_aspect_ratio= (AVRational){0,1};
    s->pix_fmt= PIX_FMT_NONE;
    s->sample_fmt= SAMPLE_FMT_S16; // FIXME: set to NONE

    s->palctrl = NULL;
    s->reget_buffer= avcodec_default_reget_buffer;
}

AVCodecContext *avcodec_alloc_context2(enum CodecType codec_type){
    AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));

    if(avctx==NULL) return NULL;

    avcodec_get_context_defaults2(avctx, codec_type);

    return avctx;
}

void avcodec_get_context_defaults(AVCodecContext *s){
    avcodec_get_context_defaults2(s, CODEC_TYPE_UNKNOWN);
}

AVCodecContext *avcodec_alloc_context(void){
    return avcodec_alloc_context2(CODEC_TYPE_UNKNOWN);
}

void avcodec_get_frame_defaults(AVFrame *pic){
    memset(pic, 0, sizeof(AVFrame));

    pic->pts= AV_NOPTS_VALUE;
    pic->key_frame= 1;
}

AVFrame *avcodec_alloc_frame(void){
    AVFrame *pic= av_malloc(sizeof(AVFrame));

    if(pic==NULL) return NULL;

    avcodec_get_frame_defaults(pic);

    return pic;
}

int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)
{
    int ret= -1;

    entangled_thread_counter++;
    if(entangled_thread_counter != 1){
        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
        goto end;
    }

    if(avctx->codec)
        goto end;

    if (codec->priv_data_size > 0) {
        avctx->priv_data = av_mallocz(codec->priv_data_size);
        if (!avctx->priv_data) {
            ret = AVERROR(ENOMEM);
            goto end;
        }
    } else {
        avctx->priv_data = NULL;
    }

    if(avctx->coded_width && avctx->coded_height)
        avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
    else if(avctx->width && avctx->height)
        avcodec_set_dimensions(avctx, avctx->width, avctx->height);

    if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height)){
        av_freep(&avctx->priv_data);
        ret = AVERROR(EINVAL);
        goto end;
    }

    avctx->codec = codec;
    avctx->codec_id = codec->id;
    avctx->frame_number = 0;
    if(avctx->codec->init){
        ret = avctx->codec->init(avctx);
        if (ret < 0) {
            av_freep(&avctx->priv_data);
            avctx->codec= NULL;
            goto end;
        }
    }
    ret=0;
end:
    entangled_thread_counter--;
    return ret;
}

int attribute_align_arg avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
                         const short *samples)
{
    if(buf_size < FF_MIN_BUFFER_SIZE && 0){
        av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
        return -1;
    }
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){
        int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)samples);
        avctx->frame_number++;
        return ret;
    }else
        return 0;
}

int attribute_align_arg avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
                         const AVFrame *pict)
{
    if(buf_size < FF_MIN_BUFFER_SIZE){
        av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");
        return -1;
    }
    if(avcodec_check_dimensions(avctx,avctx->width,avctx->height))
        return -1;
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){
        int ret = avctx->codec->encode(avctx, buf, buf_size, (void *)pict);
        avctx->frame_number++;
        emms_c(); //needed to avoid an emms_c() call before every return;

        return ret;
    }else
        return 0;
}

int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
                            const AVSubtitle *sub)
{
    int ret;
    ret = avctx->codec->encode(avctx, buf, buf_size, (void *)sub);
    avctx->frame_number++;
    return ret;
}

int attribute_align_arg avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
                         int *got_picture_ptr,
                         uint8_t *buf, int buf_size)
{
    int ret;

    *got_picture_ptr= 0;
    if((avctx->coded_width||avctx->coded_height) && avcodec_check_dimensions(avctx,avctx->coded_width,avctx->coded_height))
        return -1;
    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || buf_size){
        ret = avctx->codec->decode(avctx, picture, got_picture_ptr,
                                buf, buf_size);

        emms_c(); //needed to avoid an emms_c() call before every return;

        if (*got_picture_ptr)
            avctx->frame_number++;
    }else
        ret= 0;

    return ret;
}

int attribute_align_arg avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
                         int *frame_size_ptr,
                         uint8_t *buf, int buf_size)
{
    int ret;

    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || buf_size){
        //FIXME remove the check below _after_ ensuring that all audio check that the available space is enough
        if(*frame_size_ptr < AVCODEC_MAX_AUDIO_FRAME_SIZE){
            av_log(avctx, AV_LOG_ERROR, "buffer smaller than AVCODEC_MAX_AUDIO_FRAME_SIZE\n");
            return -1;
        }
        if(*frame_size_ptr < FF_MIN_BUFFER_SIZE ||
        *frame_size_ptr < avctx->channels * avctx->frame_size * sizeof(int16_t)){
            av_log(avctx, AV_LOG_ERROR, "buffer %d too small\n", *frame_size_ptr);
            return -1;
        }

        ret = avctx->codec->decode(avctx, samples, frame_size_ptr,
                                buf, buf_size);
        avctx->frame_number++;
    }else{
        ret= 0;
        *frame_size_ptr=0;
    }
    return ret;
}

#if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
                         int *frame_size_ptr,
                         uint8_t *buf, int buf_size){
    *frame_size_ptr= AVCODEC_MAX_AUDIO_FRAME_SIZE;
    return avcodec_decode_audio2(avctx, samples, frame_size_ptr, buf, buf_size);
}
#endif

int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
                            int *got_sub_ptr,
                            const uint8_t *buf, int buf_size)
{
    int ret;

    *got_sub_ptr = 0;
    ret = avctx->codec->decode(avctx, sub, got_sub_ptr,
                               (uint8_t *)buf, buf_size);
    if (*got_sub_ptr)
        avctx->frame_number++;
    return ret;
}

int avcodec_close(AVCodecContext *avctx)
{
    entangled_thread_counter++;
    if(entangled_thread_counter != 1){
        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");
        entangled_thread_counter--;
        return -1;
    }

    if (ENABLE_THREADS && avctx->thread_opaque)
        avcodec_thread_free(avctx);
    if (avctx->codec->avclose)
        avctx->codec->avclose(avctx);
    avcodec_default_free_buffers(avctx);
    av_freep(&avctx->priv_data);
    avctx->codec = NULL;
    entangled_thread_counter--;
    return 0;
}

AVCodec *avcodec_find_encoder(enum CodecID id)
{
    AVCodec *p;
    p = first_avcodec;
    while (p) {
        if (p->encode != NULL && p->id == id)
            return p;
        p = p->next;