specrec.c

这是著名的TCPMP播放器在WINDWOWS,和WINCE下编译通过的源程序.笔者对其中的LIBMAD库做了针对ARM MPU的优化. 并增加了词幕功能.

#ifdef MAIN_DEC
    /* MAIN object type prediction */
    if (hDecoder->object_type == MAIN)
    {
        /* allocate the state only when needed */
        if (hDecoder->pred_stat[channel] == NULL)
        {
            hDecoder->pred_stat[channel] = (pred_state*)faad_malloc(hDecoder->frameLength * sizeof(pred_state));
            reset_all_predictors(hDecoder->pred_stat[channel], hDecoder->frameLength);
        }
    }
#endif

#ifdef LTP_DEC
    if (is_ltp_ot(hDecoder->object_type))
    {
        /* allocate the state only when needed */
        if (hDecoder->lt_pred_stat[channel] == NULL)
        {
            hDecoder->lt_pred_stat[channel] = (int16_t*)faad_malloc(hDecoder->frameLength*4 * sizeof(int16_t));
            memset(hDecoder->lt_pred_stat[channel], 0, hDecoder->frameLength*4 * sizeof(int16_t));
        }
    }
#endif

    if (hDecoder->time_out[channel] != NULL)
    {
        faad_free(hDecoder->time_out[channel]);
        hDecoder->time_out[channel] = NULL;
    }

    {
        mul = 1;
#ifdef SBR_DEC
        hDecoder->sbr_alloced[hDecoder->fr_ch_ele] = 0;
        if ((hDecoder->sbr_present_flag == 1) || (hDecoder->forceUpSampling == 1))
        {
            /* SBR requires 2 times as much output data */
            mul = 2;
            hDecoder->sbr_alloced[hDecoder->fr_ch_ele] = 1;
        }
#endif
        hDecoder->time_out[channel] = (real_t*)faad_malloc(mul*hDecoder->frameLength*sizeof(real_t));
		if (!hDecoder->time_out[channel])
			return 28;
        memset(hDecoder->time_out[channel], 0, mul*hDecoder->frameLength*sizeof(real_t));
    }
#if (defined(PS_DEC) || defined(DRM_PS))
    if (output_channels == 2)
    {
        if (hDecoder->time_out[channel+1] != NULL)
        {
            faad_free(hDecoder->time_out[channel+1]);
            hDecoder->time_out[channel+1] = NULL;
        }

        hDecoder->time_out[channel+1] = (real_t*)faad_malloc(mul*hDecoder->frameLength*sizeof(real_t));
		if (!hDecoder->time_out[channel+1])
			return 28;
        memset(hDecoder->time_out[channel+1], 0, mul*hDecoder->frameLength*sizeof(real_t));
    }
#endif

    if (hDecoder->fb_intermed[channel] != NULL)
    {
        faad_free(hDecoder->fb_intermed[channel]);
        hDecoder->fb_intermed[channel] = NULL;
    }

    hDecoder->fb_intermed[channel] = (real_t*)faad_malloc(hDecoder->frameLength*sizeof(real_t));
	if (!hDecoder->fb_intermed[channel])
		return 28;
    memset(hDecoder->fb_intermed[channel], 0, hDecoder->frameLength*sizeof(real_t));


#ifdef SSR_DEC
    if (hDecoder->object_type == SSR)
    {
        if (hDecoder->ssr_overlap[channel] == NULL)
        {
            hDecoder->ssr_overlap[channel] = (real_t*)faad_malloc(2*hDecoder->frameLength*sizeof(real_t));
            memset(hDecoder->ssr_overlap[channel], 0, 2*hDecoder->frameLength*sizeof(real_t));
        }
        if (hDecoder->prev_fmd[channel] == NULL)
        {
            uint16_t k;
            hDecoder->prev_fmd[channel] = (real_t*)faad_malloc(2*hDecoder->frameLength*sizeof(real_t));
            for (k = 0; k < 2*hDecoder->frameLength; k++)
                hDecoder->prev_fmd[channel][k] = REAL_CONST(-1);
        }
    }
#endif

    return 0;
}

static uint8_t allocate_channel_pair(NeAACDecHandle hDecoder,
                                     uint8_t channel, uint8_t paired_channel)
{
    uint8_t mul = 1;

#ifdef MAIN_DEC
    /* MAIN object type prediction */
    if (hDecoder->object_type == MAIN)
    {
        /* allocate the state only when needed */
        if (hDecoder->pred_stat[channel] == NULL)
        {
            hDecoder->pred_stat[channel] = (pred_state*)faad_malloc(hDecoder->frameLength * sizeof(pred_state));
            reset_all_predictors(hDecoder->pred_stat[channel], hDecoder->frameLength);
        }
        if (hDecoder->pred_stat[paired_channel] == NULL)
        {
            hDecoder->pred_stat[paired_channel] = (pred_state*)faad_malloc(hDecoder->frameLength * sizeof(pred_state));
            reset_all_predictors(hDecoder->pred_stat[paired_channel], hDecoder->frameLength);
        }
    }
#endif

#ifdef LTP_DEC
    if (is_ltp_ot(hDecoder->object_type))
    {
        /* allocate the state only when needed */
        if (hDecoder->lt_pred_stat[channel] == NULL)
        {
            hDecoder->lt_pred_stat[channel] = (int16_t*)faad_malloc(hDecoder->frameLength*4 * sizeof(int16_t));
            memset(hDecoder->lt_pred_stat[channel], 0, hDecoder->frameLength*4 * sizeof(int16_t));
        }
        if (hDecoder->lt_pred_stat[paired_channel] == NULL)
        {
            hDecoder->lt_pred_stat[paired_channel] = (int16_t*)faad_malloc(hDecoder->frameLength*4 * sizeof(int16_t));
            memset(hDecoder->lt_pred_stat[paired_channel], 0, hDecoder->frameLength*4 * sizeof(int16_t));
        }
    }
#endif

    if (hDecoder->time_out[channel] == NULL)
    {
        mul = 1;
#ifdef SBR_DEC
        hDecoder->sbr_alloced[hDecoder->fr_ch_ele] = 0;
        if ((hDecoder->sbr_present_flag == 1) || (hDecoder->forceUpSampling == 1))
        {
            /* SBR requires 2 times as much output data */
            mul = 2;
            hDecoder->sbr_alloced[hDecoder->fr_ch_ele] = 1;
        }
#endif
        hDecoder->time_out[channel] = (real_t*)faad_malloc(mul*hDecoder->frameLength*sizeof(real_t));
		if (!hDecoder->time_out[channel])
			return 28;
        memset(hDecoder->time_out[channel], 0, mul*hDecoder->frameLength*sizeof(real_t));
    }
    if (hDecoder->time_out[paired_channel] == NULL)
    {
        hDecoder->time_out[paired_channel] = (real_t*)faad_malloc(mul*hDecoder->frameLength*sizeof(real_t));
		if (!hDecoder->time_out[paired_channel])
			return 28;
        memset(hDecoder->time_out[paired_channel], 0, mul*hDecoder->frameLength*sizeof(real_t));
    }

    if (hDecoder->fb_intermed[channel] == NULL)
    {
        hDecoder->fb_intermed[channel] = (real_t*)faad_malloc(hDecoder->frameLength*sizeof(real_t));
		if (!hDecoder->fb_intermed[channel])
			return 28;
        memset(hDecoder->fb_intermed[channel], 0, hDecoder->frameLength*sizeof(real_t));
    }
    if (hDecoder->fb_intermed[paired_channel] == NULL)
    {
        hDecoder->fb_intermed[paired_channel] = (real_t*)faad_malloc(hDecoder->frameLength*sizeof(real_t));
		if (!hDecoder->fb_intermed[paired_channel])
			return 28;
        memset(hDecoder->fb_intermed[paired_channel], 0, hDecoder->frameLength*sizeof(real_t));
    }

#ifdef SSR_DEC
    if (hDecoder->object_type == SSR)
    {
        if (hDecoder->ssr_overlap[cpe->channel] == NULL)
        {
            hDecoder->ssr_overlap[cpe->channel] = (real_t*)faad_malloc(2*hDecoder->frameLength*sizeof(real_t));
            memset(hDecoder->ssr_overlap[cpe->channel], 0, 2*hDecoder->frameLength*sizeof(real_t));
        }
        if (hDecoder->ssr_overlap[cpe->paired_channel] == NULL)
        {
            hDecoder->ssr_overlap[cpe->paired_channel] = (real_t*)faad_malloc(2*hDecoder->frameLength*sizeof(real_t));
            memset(hDecoder->ssr_overlap[cpe->paired_channel], 0, 2*hDecoder->frameLength*sizeof(real_t));
        }
        if (hDecoder->prev_fmd[cpe->channel] == NULL)
        {
            uint16_t k;
            hDecoder->prev_fmd[cpe->channel] = (real_t*)faad_malloc(2*hDecoder->frameLength*sizeof(real_t));
            for (k = 0; k < 2*hDecoder->frameLength; k++)
                hDecoder->prev_fmd[cpe->channel][k] = REAL_CONST(-1);
        }
        if (hDecoder->prev_fmd[cpe->paired_channel] == NULL)
        {
            uint16_t k;
            hDecoder->prev_fmd[cpe->paired_channel] = (real_t*)faad_malloc(2*hDecoder->frameLength*sizeof(real_t));
            for (k = 0; k < 2*hDecoder->frameLength; k++)
                hDecoder->prev_fmd[cpe->paired_channel][k] = REAL_CONST(-1);
        }
    }
#endif

    return 0;
}

extern uint8_t safestack(uint8_t (*)(NeAACDecHandle hDecoder, ic_stream *ics),NeAACDecHandle hDecoder, ic_stream *ics,void**);

uint8_t sbrDecode(NeAACDecHandle hDecoder, ic_stream *ics)
{
		uint8_t channel = hDecoder->channel;
		uint8_t retval;
        uint8_t ele = hDecoder->fr_ch_ele;

        /* following case can happen when forceUpSampling == 1 */
        if (hDecoder->sbr[ele] == NULL)
        {
            hDecoder->sbr[ele] = sbrDecodeInit(hDecoder->frameLength,
                hDecoder->element_id[ele], 2*get_sample_rate(hDecoder->sf_index),
                hDecoder->downSampledSBR
#ifdef DRM
                , 0
#endif
                );
        }

        if (ics->window_sequence == EIGHT_SHORT_SEQUENCE)
            hDecoder->sbr[ele]->maxAACLine = 8*ics->swb_offset[max(ics->max_sfb-1, 0)];
        else
            hDecoder->sbr[ele]->maxAACLine = ics->swb_offset[max(ics->max_sfb-1, 0)];

        /* check if any of the PS tools is used */
#if (defined(PS_DEC) || defined(DRM_PS))
        if (hDecoder->ps_used[ele] == 0)
        {
#endif
            retval = sbrDecodeSingleFrame(hDecoder->sbr[ele], hDecoder->time_out[channel],
                hDecoder->postSeekResetFlag, hDecoder->downSampledSBR);
#if (defined(PS_DEC) || defined(DRM_PS))
        } else {
            retval = sbrDecodeSingleFramePS(hDecoder->sbr[ele], hDecoder->time_out[channel],
                hDecoder->time_out[channel+1], hDecoder->postSeekResetFlag,
                hDecoder->downSampledSBR);
        }
#endif
		return retval;
}

uint8_t sbrDecodeCouple(NeAACDecHandle hDecoder, ic_stream *ics1)
{
		uint8_t paired_channel = hDecoder->paired_channel;
		uint8_t channel = hDecoder->channel;
		uint8_t retval;
        uint8_t ele = hDecoder->fr_ch_ele;

        /* following case can happen when forceUpSampling == 1 */
        if (hDecoder->sbr[ele] == NULL)
        {
            hDecoder->sbr[ele] = sbrDecodeInit(hDecoder->frameLength,
                hDecoder->element_id[ele], 2*get_sample_rate(hDecoder->sf_index),
                hDecoder->downSampledSBR
#ifdef DRM
                , 0
#endif
                );
        }

        if (ics1->window_sequence == EIGHT_SHORT_SEQUENCE)
            hDecoder->sbr[ele]->maxAACLine = 8*ics1->swb_offset[max(ics1->max_sfb-1, 0)];
        else
            hDecoder->sbr[ele]->maxAACLine = ics1->swb_offset[max(ics1->max_sfb-1, 0)];

        retval = sbrDecodeCoupleFrame(hDecoder->sbr[ele],
            hDecoder->time_out[channel], hDecoder->time_out[paired_channel],
            hDecoder->postSeekResetFlag, hDecoder->downSampledSBR);

		return retval;
}

uint8_t reconstruct_single_channel(NeAACDecHandle hDecoder, ic_stream *ics)
{
    uint8_t retval;
	uint8_t channel = hDecoder->channel;
    uint8_t output_channels;

#ifdef PROFILE
    int64_t count = faad_get_ts();
#endif

    /* always allocate 2 channels, PS can always "suddenly" turn up */
#if ( (defined(DRM) && defined(DRM_PS)) )
    output_channels = 2;
#elif defined(PS_DEC)
    if (hDecoder->ps_used[hDecoder->fr_ch_ele])
        output_channels = 2;
    else
        output_channels = 1;
#endif

    if (hDecoder->element_output_channels[hDecoder->fr_ch_ele] == 0)
    {
        /* element_output_channels not set yet */
        hDecoder->element_output_channels[hDecoder->fr_ch_ele] = output_channels;
    } else if (hDecoder->element_output_channels[hDecoder->fr_ch_ele] != output_channels) {
        /* element inconsistency */

        /* this only happens if PS is actually found but not in the first frame
         * this means that there is only 1 bitstream element!
         */

        /* reset the allocation */
        hDecoder->element_alloced[hDecoder->fr_ch_ele] = 0;

        hDecoder->element_output_channels[hDecoder->fr_ch_ele] = output_channels;

        //return 21;
    }

    if (hDecoder->element_alloced[hDecoder->fr_ch_ele] == 0)
    {
        retval = allocate_single_channel(hDecoder, channel, output_channels);
        if (retval > 0)
            return retval;

        hDecoder->element_alloced[hDecoder->fr_ch_ele] = 1;
    }

	ics->buffer = hDecoder->time_out[channel];

    /* dequantisation and scaling */
    retval = quant_to_spec(hDecoder, ics, hDecoder->d.spec_data[0], hDecoder->frameLength);
    if (retval > 0)
        return retval;

#ifdef PROFILE