static int mjpegb_decode_frame(AVCodecContext *avctx, 

                              void *data, int *data_size,

                              uint8_t *buf, int buf_size)

{

    MJpegDecodeContext *s = avctx->priv_data;

    uint8_t *buf_end, *buf_ptr;

    AVFrame *picture = data;

    GetBitContext hgb; /* for the header */

    uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;

    uint32_t field_size, sod_offs;



    /* no supplementary picture */

    if (buf_size == 0)

        return 0;



    buf_ptr = buf;

    buf_end = buf + buf_size;

    

read_header:

    /* reset on every SOI */

    s->restart_interval = 0;

    s->mjpb_skiptosod = 0;



    init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);



    skip_bits(&hgb, 32); /* reserved zeros */

    

    if (get_bits_long(&hgb, 32) != be2me_32(ff_get_fourcc("mjpg")))

    {

	dprintf("not mjpeg-b (bad fourcc)\n");

	return 0;

    }



    field_size = get_bits_long(&hgb, 32); /* field size */

    dprintf("field size: 0x%x\n", field_size);

    skip_bits(&hgb, 32); /* padded field size */

    second_field_offs = get_bits_long(&hgb, 32);

    dprintf("second field offs: 0x%x\n", second_field_offs);

    if (second_field_offs)

	s->interlaced = 1;



    dqt_offs = get_bits_long(&hgb, 32);

    dprintf("dqt offs: 0x%x\n", dqt_offs);

    if (dqt_offs)

    {

	init_get_bits(&s->gb, buf+dqt_offs, (buf_end - (buf+dqt_offs))*8);

	s->start_code = DQT;

	mjpeg_decode_dqt(s);

    }

    

    dht_offs = get_bits_long(&hgb, 32);

    dprintf("dht offs: 0x%x\n", dht_offs);

    if (dht_offs)

    {

	init_get_bits(&s->gb, buf+dht_offs, (buf_end - (buf+dht_offs))*8);

	s->start_code = DHT;

	mjpeg_decode_dht(s);

    }



    sof_offs = get_bits_long(&hgb, 32);

    dprintf("sof offs: 0x%x\n", sof_offs);

    if (sof_offs)

    {

	init_get_bits(&s->gb, buf+sof_offs, (buf_end - (buf+sof_offs))*8);

	s->start_code = SOF0;

	if (mjpeg_decode_sof(s) < 0)

	    return -1;

    }



    sos_offs = get_bits_long(&hgb, 32);

    dprintf("sos offs: 0x%x\n", sos_offs);

    sod_offs = get_bits_long(&hgb, 32);

    dprintf("sod offs: 0x%x\n", sod_offs);

    if (sos_offs)

    {

//	init_get_bits(&s->gb, buf+sos_offs, (buf_end - (buf+sos_offs))*8);

	init_get_bits(&s->gb, buf+sos_offs, field_size*8);

	s->mjpb_skiptosod = (sod_offs - sos_offs - show_bits(&s->gb, 16));

	s->start_code = SOS;

	mjpeg_decode_sos(s);

    }



    if (s->interlaced) {

        s->bottom_field ^= 1;

        /* if not bottom field, do not output image yet */

        if (s->bottom_field && second_field_offs)

	{

	    buf_ptr = buf + second_field_offs;

	    second_field_offs = 0;

	    goto read_header;

    	}

    }



    //XXX FIXME factorize, this looks very similar to the EOI code



    *picture= s->picture;

    *data_size = sizeof(AVFrame);

    

    if(!s->lossless){

        picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]); 

        picture->qstride= 0;

        picture->qscale_table= s->qscale_table;

        memset(picture->qscale_table, picture->quality, (s->width+15)/16);

        if(avctx->debug & FF_DEBUG_QP)

            av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

        picture->quality*= FF_QP2LAMBDA;

    }



    return buf_ptr - buf;

}

static int mjpegb_decode_frame(AVCodecContext *avctx, 

                              void *data, int *data_size,

                              uint8_t *buf, int buf_size)

{

    MJpegDecodeContext *s = avctx->priv_data;

    uint8_t *buf_end, *buf_ptr;

    AVFrame *picture = data;

    GetBitContext hgb; 

    uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;

    uint32_t field_size, sod_offs;



    

    if (buf_size == 0)

        return 0;



    buf_ptr = buf;

    buf_end = buf + buf_size;

    

read_header:

    

    s->restart_interval = 0;

    s->mjpb_skiptosod = 0;



    init_get_bits(&hgb, buf_ptr, (buf_end - buf_ptr)*8);



    skip_bits(&hgb, 32); 

    

    if (get_bits_long(&hgb, 32) != be2me_32(ff_get_fourcc("mjpg")))

    {

	dprintf("not mjpeg-b (bad fourcc)\n");

	return 0;

    }



    field_size = get_bits_long(&hgb, 32); 

    dprintf("field size: 0x%x\n", field_size);

    skip_bits(&hgb, 32); 

    second_field_offs = get_bits_long(&hgb, 32);

    dprintf("second field offs: 0x%x\n", second_field_offs);

    if (second_field_offs)

	s->interlaced = 1;



    dqt_offs = get_bits_long(&hgb, 32);

    dprintf("dqt offs: 0x%x\n", dqt_offs);

    if (dqt_offs)

    {

	init_get_bits(&s->gb, buf+dqt_offs, (buf_end - (buf+dqt_offs))*8);

	s->start_code = DQT;

	mjpeg_decode_dqt(s);

    }

    

    dht_offs = get_bits_long(&hgb, 32);

    dprintf("dht offs: 0x%x\n", dht_offs);

    if (dht_offs)

    {

	init_get_bits(&s->gb, buf+dht_offs, (buf_end - (buf+dht_offs))*8);

	s->start_code = DHT;

	mjpeg_decode_dht(s);

    }



    sof_offs = get_bits_long(&hgb, 32);

    dprintf("sof offs: 0x%x\n", sof_offs);

    if (sof_offs)

    {

	init_get_bits(&s->gb, buf+sof_offs, (buf_end - (buf+sof_offs))*8);

	s->start_code = SOF0;

	if (mjpeg_decode_sof(s) < 0)

	    return -1;

    }



    sos_offs = get_bits_long(&hgb, 32);

    dprintf("sos offs: 0x%x\n", sos_offs);

    sod_offs = get_bits_long(&hgb, 32);

    dprintf("sod offs: 0x%x\n", sod_offs);

    if (sos_offs)

    {



	init_get_bits(&s->gb, buf+sos_offs, field_size*8);

	s->mjpb_skiptosod = (sod_offs - sos_offs - show_bits(&s->gb, 16));

	s->start_code = SOS;

	mjpeg_decode_sos(s);

    }



    if (s->interlaced) {

        s->bottom_field ^= 1;

        

        if (s->bottom_field && second_field_offs)

	{

	    buf_ptr = buf + second_field_offs;

	    second_field_offs = 0;

	    goto read_header;

    	}

    }



    



    *picture= s->picture;

    *data_size = sizeof(AVFrame);

    

    if(!s->lossless){

        picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]); 

        picture->qstride= 0;

        picture->qscale_table= s->qscale_table;

        memset(picture->qscale_table, picture->quality, (s->width+15)/16);

        if(avctx->debug & FF_DEBUG_QP)

            av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

        picture->quality*= FF_QP2LAMBDA;

    }



    return buf_ptr - buf;

}

static int FUNC_0(AVCodecContext *VAR_0, 

                              void *VAR_1, int *VAR_2,

                              uint8_t *VAR_3, int VAR_4)

{

    MJpegDecodeContext *s = VAR_0->priv_data;

    uint8_t *buf_end, *buf_ptr;

    AVFrame *picture = VAR_1;

    GetBitContext hgb; 

    uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;

    uint32_t field_size, sod_offs;



    

    if (VAR_4 == 0)

        return 0;



    buf_ptr = VAR_3;

    buf_end = VAR_3 + VAR_4;

    

read_header:

    

    s->restart_interval = 0;

    s->mjpb_skiptosod = 0;



    init_get_bits(&hgb, buf_ptr, (buf_end - buf_ptr)*8);



    skip_bits(&hgb, 32); 

    

    if (get_bits_long(&hgb, 32) != be2me_32(ff_get_fourcc("mjpg")))

    {

	dprintf("not mjpeg-b (bad fourcc)\n");

	return 0;

    }



    field_size = get_bits_long(&hgb, 32); 

    dprintf("field size: 0x%x\n", field_size);

    skip_bits(&hgb, 32); 

    second_field_offs = get_bits_long(&hgb, 32);

    dprintf("second field offs: 0x%x\n", second_field_offs);

    if (second_field_offs)

	s->interlaced = 1;



    dqt_offs = get_bits_long(&hgb, 32);

    dprintf("dqt offs: 0x%x\n", dqt_offs);

    if (dqt_offs)

    {

	init_get_bits(&s->gb, VAR_3+dqt_offs, (buf_end - (VAR_3+dqt_offs))*8);

	s->start_code = DQT;

	mjpeg_decode_dqt(s);

    }

    

    dht_offs = get_bits_long(&hgb, 32);

    dprintf("dht offs: 0x%x\n", dht_offs);

    if (dht_offs)

    {

	init_get_bits(&s->gb, VAR_3+dht_offs, (buf_end - (VAR_3+dht_offs))*8);

	s->start_code = DHT;

	mjpeg_decode_dht(s);

    }



    sof_offs = get_bits_long(&hgb, 32);

    dprintf("sof offs: 0x%x\n", sof_offs);

    if (sof_offs)

    {

	init_get_bits(&s->gb, VAR_3+sof_offs, (buf_end - (VAR_3+sof_offs))*8);

	s->start_code = SOF0;

	if (mjpeg_decode_sof(s) < 0)

	    return -1;

    }



    sos_offs = get_bits_long(&hgb, 32);

    dprintf("sos offs: 0x%x\n", sos_offs);

    sod_offs = get_bits_long(&hgb, 32);

    dprintf("sod offs: 0x%x\n", sod_offs);

    if (sos_offs)

    {



	init_get_bits(&s->gb, VAR_3+sos_offs, field_size*8);

	s->mjpb_skiptosod = (sod_offs - sos_offs - show_bits(&s->gb, 16));

	s->start_code = SOS;

	mjpeg_decode_sos(s);

    }



    if (s->interlaced) {

        s->bottom_field ^= 1;

        

        if (s->bottom_field && second_field_offs)

	{

	    buf_ptr = VAR_3 + second_field_offs;

	    second_field_offs = 0;

	    goto read_header;

    	}

    }



    



    *picture= s->picture;

    *VAR_2 = sizeof(AVFrame);

    

    if(!s->lossless){

        picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]); 

        picture->qstride= 0;

        picture->qscale_table= s->qscale_table;

        memset(picture->qscale_table, picture->quality, (s->width+15)/16);

        if(VAR_0->debug & FF_DEBUG_QP)

            av_log(VAR_0, AV_LOG_DEBUG, "QP: %d\n", picture->quality);

        picture->quality*= FF_QP2LAMBDA;

    }



    return buf_ptr - VAR_3;

}

static int FUNC_0(AVCodecContext *VAR_0,
void *VAR_1, int *VAR_2,
uint8_t *VAR_3, int VAR_4)
{ MJpegDecodeContext *s = VAR_0->priv_data; uint8_t *buf_end, *buf_ptr; AVFrame *picture = VAR_1; GetBitContext hgb; uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs; uint32_t field_size, sod_offs; if (VAR_4 == 0)
return 0; buf_ptr = VAR_3; buf_end = VAR_3 + VAR_4; read_header:
s->restart_interval = 0; s->mjpb_skiptosod = 0; init_get_bits(&hgb, buf_ptr, (buf_end - buf_ptr)*8); skip_bits(&hgb, 32); if (get_bits_long(&hgb, 32) != be2me_32(ff_get_fourcc("mjpg")))
{ dprintf("not mjpeg-b (bad fourcc)\n"); return 0; } field_size = get_bits_long(&hgb, 32); dprintf("field size: 0x%x\n", field_size); skip_bits(&hgb, 32); second_field_offs = get_bits_long(&hgb, 32); dprintf("second field offs: 0x%x\n", second_field_offs); if (second_field_offs)
s->interlaced = 1; dqt_offs = get_bits_long(&hgb, 32); dprintf("dqt offs: 0x%x\n", dqt_offs); if (dqt_offs)
{ init_get_bits(&s->gb, VAR_3+dqt_offs, (buf_end - (VAR_3+dqt_offs))*8); s->start_code = DQT; mjpeg_decode_dqt(s); } dht_offs = get_bits_long(&hgb, 32); dprintf("dht offs: 0x%x\n", dht_offs); if (dht_offs)
{ init_get_bits(&s->gb, VAR_3+dht_offs, (buf_end - (VAR_3+dht_offs))*8); s->start_code = DHT; mjpeg_decode_dht(s); } sof_offs = get_bits_long(&hgb, 32); dprintf("sof offs: 0x%x\n", sof_offs); if (sof_offs)
{ init_get_bits(&s->gb, VAR_3+sof_offs, (buf_end - (VAR_3+sof_offs))*8); s->start_code = SOF0; if (mjpeg_decode_sof(s) < 0)
return -1; } sos_offs = get_bits_long(&hgb, 32); dprintf("sos offs: 0x%x\n", sos_offs); sod_offs = get_bits_long(&hgb, 32); dprintf("sod offs: 0x%x\n", sod_offs); if (sos_offs)
{ init_get_bits(&s->gb, VAR_3+sos_offs, field_size*8); s->mjpb_skiptosod = (sod_offs - sos_offs - show_bits(&s->gb, 16)); s->start_code = SOS; mjpeg_decode_sos(s); } if (s->interlaced) { s->bottom_field ^= 1; if (s->bottom_field && second_field_offs)
{ buf_ptr = VAR_3 + second_field_offs; second_field_offs = 0; goto read_header; } } *picture= s->picture; *VAR_2 = sizeof(AVFrame); if(!s->lossless){ picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]); picture->qstride= 0; picture->qscale_table= s->qscale_table; memset(picture->qscale_table, picture->quality, (s->width+15)/16); if(VAR_0->debug & FF_DEBUG_QP)
av_log(VAR_0, AV_LOG_DEBUG, "QP: %d\n", picture->quality); picture->quality*= FF_QP2LAMBDA; } return buf_ptr - VAR_3; }