libavcodec/adpcm.c:1568: error: Buffer Overrun L2
  Offset: [0, 31] Size: 16.

libavcodec/adpcm.c:1567:14: <Offset trace>
1565.         samplecnt = bytestream_get_be32(&src);
1566. 
1567.         for (i = 0; i < 32; i++)
                   ^
1568.             table[0][i] = (int16_t)bytestream_get_be16(&src);
1569. 

libavcodec/adpcm.c:1567:14: Assignment
1565.         samplecnt = bytestream_get_be32(&src);
1566. 
1567.         for (i = 0; i < 32; i++)
                   ^
1568.             table[0][i] = (int16_t)bytestream_get_be16(&src);
1569. 

libavcodec/adpcm.c:879:1: <Length trace>
877.     }
878. 
879. static int adpcm_decode_frame(AVCodecContext *avctx,
     ^
880.                             void *data, int *data_size,
881.                             AVPacket *avpkt)

libavcodec/adpcm.c:879:1: Array declaration
877.     }
878. 
879. static int adpcm_decode_frame(AVCodecContext *avctx,
     ^
880.                             void *data, int *data_size,
881.                             AVPacket *avpkt)

libavcodec/adpcm.c:1568:13: Array access: Offset: [0, 31] Size: 16
1566. 
1567.         for (i = 0; i < 32; i++)
1568.             table[0][i] = (int16_t)bytestream_get_be16(&src);
                  ^
1569. 
1570.         /* Initialize the previous sample.  */

static int adpcm_decode_frame(AVCodecContext *avctx,
                            void *data, int *data_size,
                            AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    ADPCMContext *c = avctx->priv_data;
    ADPCMChannelStatus *cs;
    int n, m, channel, i;
    int block_predictor[2];
    short *samples;
    short *samples_end;
    const uint8_t *src;
    int st;
    unsigned char last_byte = 0;
    unsigned char nibble;
    int decode_top_nibble_next = 0;
    int diff_channel;
    uint32_t samples_in_chunk;
    int32_t previous_left_sample, previous_right_sample;
    int32_t current_left_sample, current_right_sample;
    int32_t next_left_sample, next_right_sample;
    int32_t coeff1l, coeff2l, coeff1r, coeff2r;
    uint8_t shift_left, shift_right;
    int count1, count2;
    int coeff[2][2], shift[2];
    if (!buf_size)
        return 0;
    if(*data_size/4 < buf_size + 8)
        return -1;
    samples = data;
    samples_end= samples + *data_size/2;
    *data_size= 0;
    src = buf;
    st = avctx->channels == 2 ? 1 : 0;
    switch(avctx->codec->id) {
    case CODEC_ID_ADPCM_IMA_QT:
        n = buf_size - 2*avctx->channels;
        for (channel = 0; channel < avctx->channels; channel++) {
            cs = &(c->status[channel]);
            cs->predictor = (*src++) << 8;
            cs->predictor |= (*src & 0x80);
            cs->predictor &= 0xFF80;
            if(cs->predictor & 0x8000)
                cs->predictor -= 0x10000;
            cs->predictor = av_clip_int16(cs->predictor);
            cs->step_index = (*src++) & 0x7F;
            if (cs->step_index > 88){
                av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
                cs->step_index = 88;
            }
            cs->step = step_table[cs->step_index];
            samples = (short*)data + channel;
            for(m=32; n>0 && m>0; n--, m--) {
                *samples = adpcm_ima_expand_nibble(cs, src[0] & 0x0F, 3);
                samples += avctx->channels;
                *samples = adpcm_ima_expand_nibble(cs, src[0] >> 4  , 3);
                samples += avctx->channels;
                src ++;
            }
        }
        if (st)
            samples--;
        break;
    case CODEC_ID_ADPCM_IMA_WAV:
        if (avctx->block_align != 0 && buf_size > avctx->block_align)
            buf_size = avctx->block_align;
        for(i=0; i<avctx->channels; i++){
            cs = &(c->status[i]);
            cs->predictor = *samples++ = (int16_t)bytestream_get_le16(&src);
            cs->step_index = *src++;
            if (cs->step_index > 88){
                av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\n", cs->step_index);
                cs->step_index = 88;
            }
            if (*src++) av_log(avctx, AV_LOG_ERROR, "unused byte should be null but is %d!!\n", src[-1]);
        }
        while(src < buf + buf_size){
            for(m=0; m<4; m++){
                for(i=0; i<=st; i++)
                    *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] & 0x0F, 3);
                for(i=0; i<=st; i++)
                    *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] >> 4  , 3);
                src++;
            }
            src += 4*st;
        }
        break;
    case CODEC_ID_ADPCM_4XM:
        cs = &(c->status[0]);
        c->status[0].predictor= (int16_t)bytestream_get_le16(&src);
        if(st){
            c->status[1].predictor= (int16_t)bytestream_get_le16(&src);
        }
        c->status[0].step_index= (int16_t)bytestream_get_le16(&src);
        if(st){
            c->status[1].step_index= (int16_t)bytestream_get_le16(&src);
        }
        if (cs->step_index < 0) cs->step_index = 0;
        if (cs->step_index > 88) cs->step_index = 88;
        m= (buf_size - (src - buf))>>st;
        for(i=0; i<m; i++) {
            *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] & 0x0F, 4);
            if (st)
                *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] & 0x0F, 4);
            *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] >> 4, 4);
            if (st)
                *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] >> 4, 4);
        }
        src += m<<st;
        break;
    case CODEC_ID_ADPCM_MS:
        if (avctx->block_align != 0 && buf_size > avctx->block_align)
            buf_size = avctx->block_align;
        n = buf_size - 7 * avctx->channels;
        if (n < 0)
            return -1;
        block_predictor[0] = av_clip(*src++, 0, 6);
        block_predictor[1] = 0;
        if (st)
            block_predictor[1] = av_clip(*src++, 0, 6);
        c->status[0].idelta = (int16_t)bytestream_get_le16(&src);
        if (st){
            c->status[1].idelta = (int16_t)bytestream_get_le16(&src);
        }
        c->status[0].coeff1 = AdaptCoeff1[block_predictor[0]];
        c->status[0].coeff2 = AdaptCoeff2[block_predictor[0]];
        c->status[1].coeff1 = AdaptCoeff1[block_predictor[1]];
        c->status[1].coeff2 = AdaptCoeff2[block_predictor[1]];
        c->status[0].sample1 = bytestream_get_le16(&src);
        if (st) c->status[1].sample1 = bytestream_get_le16(&src);
        c->status[0].sample2 = bytestream_get_le16(&src);
        if (st) c->status[1].sample2 = bytestream_get_le16(&src);
        *samples++ = c->status[0].sample2;
        if (st) *samples++ = c->status[1].sample2;
        *samples++ = c->status[0].sample1;
        if (st) *samples++ = c->status[1].sample1;
        for(;n>0;n--) {
            *samples++ = adpcm_ms_expand_nibble(&c->status[0 ], src[0] >> 4  );
            *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
            src ++;
        }
        break;
    case CODEC_ID_ADPCM_IMA_DK4:
        if (avctx->block_align != 0 && buf_size > avctx->block_align)
            buf_size = avctx->block_align;
        c->status[0].predictor  = (int16_t)bytestream_get_le16(&src);
        c->status[0].step_index = *src++;
        src++;
        *samples++ = c->status[0].predictor;
        if (st) {
            c->status[1].predictor  = (int16_t)bytestream_get_le16(&src);
            c->status[1].step_index = *src++;
            src++;
            *samples++ = c->status[1].predictor;
        }
        while (src < buf + buf_size) {
            *samples++ = adpcm_ima_expand_nibble(&c->status[0],
                src[0] >> 4, 3);
            if (st)
                *samples++ = adpcm_ima_expand_nibble(&c->status[1],
                    src[0] & 0x0F, 3);
            else
                *samples++ = adpcm_ima_expand_nibble(&c->status[0],
                    src[0] & 0x0F, 3);
            src++;
        }
        break;
    case CODEC_ID_ADPCM_IMA_DK3:
        if (avctx->block_align != 0 && buf_size > avctx->block_align)
            buf_size = avctx->block_align;
        if(buf_size + 16 > (samples_end - samples)*3/8)
            return -1;
        c->status[0].predictor  = (int16_t)AV_RL16(src + 10);
        c->status[1].predictor  = (int16_t)AV_RL16(src + 12);
        c->status[0].step_index = src[14];
        c->status[1].step_index = src[15];
        src += 16;
        diff_channel = c->status[1].predictor;
        while (1) {
            DK3_GET_NEXT_NIBBLE();
            adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
            DK3_GET_NEXT_NIBBLE();
            adpcm_ima_expand_nibble(&c->status[1], nibble, 3);
            diff_channel = (diff_channel + c->status[1].predictor) / 2;
            *samples++ = c->status[0].predictor + c->status[1].predictor;
            *samples++ = c->status[0].predictor - c->status[1].predictor;
            DK3_GET_NEXT_NIBBLE();
            adpcm_ima_expand_nibble(&c->status[0], nibble, 3);
            diff_channel = (diff_channel + c->status[1].predictor) / 2;
            *samples++ = c->status[0].predictor + c->status[1].predictor;
            *samples++ = c->status[0].predictor - c->status[1].predictor;
        }
        break;
    case CODEC_ID_ADPCM_IMA_ISS:
        c->status[0].predictor  = (int16_t)AV_RL16(src + 0);
        c->status[0].step_index = src[2];
        src += 4;
        if(st) {
            c->status[1].predictor  = (int16_t)AV_RL16(src + 0);
            c->status[1].step_index = src[2];
            src += 4;
        }
        while (src < buf + buf_size) {
            if (st) {
                *samples++ = adpcm_ima_expand_nibble(&c->status[0],
                    src[0] >> 4  , 3);
                *samples++ = adpcm_ima_expand_nibble(&c->status[1],
                    src[0] & 0x0F, 3);
            } else {
                *samples++ = adpcm_ima_expand_nibble(&c->status[0],
                    src[0] & 0x0F, 3);
                *samples++ = adpcm_ima_expand_nibble(&c->status[0],
                    src[0] >> 4  , 3);
            }
            src++;
        }
        break;
    case CODEC_ID_ADPCM_IMA_WS:
        while (src < buf + buf_size) {
            if (st) {
                *samples++ = adpcm_ima_expand_nibble(&c->status[0],
                    src[0] >> 4  , 3);
                *samples++ = adpcm_ima_expand_nibble(&c->status[1],
                    src[0] & 0x0F, 3);
            } else {
                *samples++ = adpcm_ima_expand_nibble(&c->status[0],
                    src[0] >> 4  , 3);
                *samples++ = adpcm_ima_expand_nibble(&c->status[0],
                    src[0] & 0x0F, 3);
            }
            src++;
        }
        break;
    case CODEC_ID_ADPCM_XA:
        while (buf_size >= 128) {
            xa_decode(samples, src, &c->status[0], &c->status[1],
                avctx->channels);
            src += 128;
            samples += 28 * 8;
            buf_size -= 128;
        }
        break;
    case CODEC_ID_ADPCM_IMA_EA_EACS:
        samples_in_chunk = bytestream_get_le32(&src) >> (1-st);
        if (samples_in_chunk > buf_size-4-(8<<st)) {
            src += buf_size - 4;
            break;
        }
        for (i=0; i<=st; i++)
            c->status[i].step_index = bytestream_get_le32(&src);
        for (i=0; i<=st; i++)
            c->status[i].predictor  = bytestream_get_le32(&src);
        for (; samples_in_chunk; samples_in_chunk--, src++) {
            *samples++ = adpcm_ima_expand_nibble(&c->status[0],  *src>>4,   3);
            *samples++ = adpcm_ima_expand_nibble(&c->status[st], *src&0x0F, 3);
        }
        break;
    case CODEC_ID_ADPCM_IMA_EA_SEAD:
        for (; src < buf+buf_size; src++) {
            *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] >> 4, 6);
            *samples++ = adpcm_ima_expand_nibble(&c->status[st],src[0]&0x0F, 6);
        }
        break;
    case CODEC_ID_ADPCM_EA:
        samples_in_chunk = AV_RL32(src);
        if (samples_in_chunk >= ((buf_size - 12) * 2)) {
            src += buf_size;
            break;
        }
        src += 4;
        current_left_sample   = (int16_t)bytestream_get_le16(&src);
        previous_left_sample  = (int16_t)bytestream_get_le16(&src);
        current_right_sample  = (int16_t)bytestream_get_le16(&src);
        previous_right_sample = (int16_t)bytestream_get_le16(&src);
        for (count1 = 0; count1 < samples_in_chunk/28;count1++) {
            coeff1l = ea_adpcm_table[ *src >> 4       ];
            coeff2l = ea_adpcm_table[(*src >> 4  ) + 4];
            coeff1r = ea_adpcm_table[*src & 0x0F];
            coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];
            src++;
            shift_left  = (*src >> 4  ) + 8;
            shift_right = (*src & 0x0F) + 8;
            src++;
            for (count2 = 0; count2 < 28; count2++) {
                next_left_sample  = (int32_t)((*src & 0xF0) << 24) >> shift_left;
                next_right_sample = (int32_t)((*src & 0x0F) << 28) >> shift_right;
                src++;
                next_left_sample = (next_left_sample +
                    (current_left_sample * coeff1l) +
                    (previous_left_sample * coeff2l) + 0x80) >> 8;
                next_right_sample = (next_right_sample +
                    (current_right_sample * coeff1r) +
                    (previous_right_sample * coeff2r) + 0x80) >> 8;
                previous_left_sample = current_left_sample;
                current_left_sample = av_clip_int16(next_left_sample);
                previous_right_sample = current_right_sample;
                current_right_sample = av_clip_int16(next_right_sample);
                *samples++ = (unsigned short)current_left_sample;
                *samples++ = (unsigned short)current_right_sample;
            }
        }
        break;
    case CODEC_ID_ADPCM_EA_MAXIS_XA:
        for(channel = 0; channel < avctx->channels; channel++) {
            for (i=0; i<2; i++)
                coeff[channel][i] = ea_adpcm_table[(*src >> 4) + 4*i];
            shift[channel] = (*src & 0x0F) + 8;
            src++;
        }
        for (count1 = 0; count1 < (buf_size - avctx->channels) / avctx->channels; count1++) {
            for(i = 4; i >= 0; i-=4) {
                for(channel = 0; channel < avctx->channels; channel++) {
                    int32_t sample = (int32_t)(((*(src+channel) >> i) & 0x0F) << 0x1C) >> shift[channel];
                    sample = (sample +
                             c->status[channel].sample1 * coeff[channel][0] +
                             c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;
                    c->status[channel].sample2 = c->status[channel].sample1;
                    c->status[channel].sample1 = av_clip_int16(sample);
                    *samples++ = c->status[channel].sample1;
                }
            }
            src+=avctx->channels;
        }
        break;
    case CODEC_ID_ADPCM_EA_R1:
    case CODEC_ID_ADPCM_EA_R2:
    case CODEC_ID_ADPCM_EA_R3: {
        const int big_endian = avctx->codec->id == CODEC_ID_ADPCM_EA_R3;
        int32_t previous_sample, current_sample, next_sample;
        int32_t coeff1, coeff2;
        uint8_t shift;
        unsigned int channel;
        uint16_t *samplesC;
        const uint8_t *srcC;
        const uint8_t *src_end = buf + buf_size;
        samples_in_chunk = (big_endian ? bytestream_get_be32(&src)
                                       : bytestream_get_le32(&src)) / 28;
        if (samples_in_chunk > UINT32_MAX/(28*avctx->channels) ||
            28*samples_in_chunk*avctx->channels > samples_end-samples) {
            src += buf_size - 4;
            break;
        }
        for (channel=0; channel<avctx->channels; channel++) {
            int32_t offset = (big_endian ? bytestream_get_be32(&src)
                                         : bytestream_get_le32(&src))
                           + (avctx->channels-channel-1) * 4;
            if ((offset < 0) || (offset >= src_end - src - 4)) break;
            srcC  = src + offset;
            samplesC = samples + channel;
            if (avctx->codec->id == CODEC_ID_ADPCM_EA_R1) {
                current_sample  = (int16_t)bytestream_get_le16(&srcC);
                previous_sample = (int16_t)bytestream_get_le16(&srcC);
            } else {
                current_sample  = c->status[channel].predictor;
                previous_sample = c->status[channel].prev_sample;
            }
            for (count1=0; count1<samples_in_chunk; count1++) {
                if (*srcC == 0xEE) {
                    srcC++;
                    if (srcC > src_end - 30*2) break;
                    current_sample  = (int16_t)bytestream_get_be16(&srcC);
                    previous_sample = (int16_t)bytestream_get_be16(&srcC);
                    for (count2=0; count2<28; count2++) {
                        *samplesC = (int16_t)bytestream_get_be16(&srcC);
                        samplesC += avctx->channels;
                    }
                } else {
                    coeff1 = ea_adpcm_table[ *srcC>>4     ];
                    coeff2 = ea_adpcm_table[(*srcC>>4) + 4];
                    shift = (*srcC++ & 0x0F) + 8;
                    if (srcC > src_end - 14) break;
                    for (count2=0; count2<28; count2++) {
                        if (count2 & 1)
                            next_sample = (int32_t)((*srcC++ & 0x0F) << 28) >> shift;
                        else
                            next_sample = (int32_t)((*srcC   & 0xF0) << 24) >> shift;
                        next_sample += (current_sample  * coeff1) +
                                       (previous_sample * coeff2);
                        next_sample = av_clip_int16(next_sample >> 8);
                        previous_sample = current_sample;
                        current_sample  = next_sample;
                        *samplesC = current_sample;
                        samplesC += avctx->channels;
                    }
                }
            }
            if (avctx->codec->id != CODEC_ID_ADPCM_EA_R1) {
                c->status[channel].predictor   = current_sample;
                c->status[channel].prev_sample = previous_sample;
            }
        }
        src = src + buf_size - (4 + 4*avctx->channels);
        samples += 28 * samples_in_chunk * avctx->channels;
        break;
    }
    case CODEC_ID_ADPCM_EA_XAS:
        if (samples_end-samples < 32*4*avctx->channels
            || buf_size < (4+15)*4*avctx->channels) {
            src += buf_size;
            break;
        }
        for (channel=0; channel<avctx->channels; channel++) {
            int coeff[2][4], shift[4];
            short *s2, *s = &samples[channel];
            for (n=0; n<4; n++, s+=32*avctx->channels) {
                for (i=0; i<2; i++)
                    coeff[i][n] = ea_adpcm_table[(src[0]&0x0F)+4*i];
                shift[n] = (src[2]&0x0F) + 8;
                for (s2=s, i=0; i<2; i++, src+=2, s2+=avctx->channels)
                    s2[0] = (src[0]&0xF0) + (src[1]<<8);
            }
            for (m=2; m<32; m+=2) {
                s = &samples[m*avctx->channels + channel];
                for (n=0; n<4; n++, src++, s+=32*avctx->channels) {
                    for (s2=s, i=0; i<8; i+=4, s2+=avctx->channels) {
                        int level = (int32_t)((*src & (0xF0>>i)) << (24+i)) >> shift[n];
                        int pred  = s2[-1*avctx->channels] * coeff[0][n]
                                  + s2[-2*avctx->channels] * coeff[1][n];
                        s2[0] = av_clip_int16((level + pred + 0x80) >> 8);
                    }
                }
            }
        }
        samples += 32*4*avctx->channels;
        break;
    case CODEC_ID_ADPCM_IMA_AMV:
    case CODEC_ID_ADPCM_IMA_SMJPEG:
        c->status[0].predictor = (int16_t)bytestream_get_le16(&src);
        c->status[0].step_index = bytestream_get_le16(&src);
        if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
            src+=4;
        while (src < buf + buf_size) {
            char hi, lo;
            lo = *src & 0x0F;
            hi = *src >> 4;
            if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)
                FFSWAP(char, hi, lo);
            *samples++ = adpcm_ima_expand_nibble(&c->status[0],
                lo, 3);
            *samples++ = adpcm_ima_expand_nibble(&c->status[0],
                hi, 3);
            src++;
        }
        break;
    case CODEC_ID_ADPCM_CT:
        while (src < buf + buf_size) {
            if (st) {
                *samples++ = adpcm_ct_expand_nibble(&c->status[0],
                    src[0] >> 4);
                *samples++ = adpcm_ct_expand_nibble(&c->status[1],
                    src[0] & 0x0F);
            } else {
                *samples++ = adpcm_ct_expand_nibble(&c->status[0],
                    src[0] >> 4);
                *samples++ = adpcm_ct_expand_nibble(&c->status[0],
                    src[0] & 0x0F);
            }
            src++;
        }
        break;
    case CODEC_ID_ADPCM_SBPRO_4:
    case CODEC_ID_ADPCM_SBPRO_3:
    case CODEC_ID_ADPCM_SBPRO_2:
        if (!c->status[0].step_index) {
            *samples++ = 128 * (*src++ - 0x80);
            if (st)
              *samples++ = 128 * (*src++ - 0x80);
            c->status[0].step_index = 1;
        }
        if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) {
            while (src < buf + buf_size) {
                *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
                    src[0] >> 4, 4, 0);
                *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
                    src[0] & 0x0F, 4, 0);
                src++;
            }
        } else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {
            while (src < buf + buf_size && samples + 2 < samples_end) {
                *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
                     src[0] >> 5        , 3, 0);
                *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
                    (src[0] >> 2) & 0x07, 3, 0);
                *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
                    src[0] & 0x03, 2, 0);
                src++;
            }
        } else {
            while (src < buf + buf_size && samples + 3 < samples_end) {
                *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
                     src[0] >> 6        , 2, 2);
                *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
                    (src[0] >> 4) & 0x03, 2, 2);
                *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],
                    (src[0] >> 2) & 0x03, 2, 2);
                *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],
                    src[0] & 0x03, 2, 2);
                src++;
            }
        }
        break;
    case CODEC_ID_ADPCM_SWF:
    {
        GetBitContext gb;
        const int *table;
        int k0, signmask, nb_bits, count;
        int size = buf_size*8;
        init_get_bits(&gb, buf, size);
        nb_bits = get_bits(&gb, 2)+2;
        table = swf_index_tables[nb_bits-2];
        k0 = 1 << (nb_bits-2);
        signmask = 1 << (nb_bits-1);
        while (get_bits_count(&gb) <= size - 22*avctx->channels) {
            for (i = 0; i < avctx->channels; i++) {
                *samples++ = c->status[i].predictor = get_sbits(&gb, 16);
                c->status[i].step_index = get_bits(&gb, 6);
            }
            for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {
                int i;
                for (i = 0; i < avctx->channels; i++) {
                    int delta = get_bits(&gb, nb_bits);
                    int step = step_table[c->status[i].step_index];
                    long vpdiff = 0;
                    int k = k0;
                    do {
                        if (delta & k)
                            vpdiff += step;
                        step >>= 1;
                        k >>= 1;
                    } while(k);
                    vpdiff += step;
                    if (delta & signmask)
                        c->status[i].predictor -= vpdiff;
                    else
                        c->status[i].predictor += vpdiff;
                    c->status[i].step_index += table[delta & (~signmask)];
                    c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);
                    c->status[i].predictor = av_clip_int16(c->status[i].predictor);
                    *samples++ = c->status[i].predictor;
                    if (samples >= samples_end) {
                        av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");
                        return -1;
                    }
                }
            }
        }
        src += buf_size;
        break;
    }
    case CODEC_ID_ADPCM_YAMAHA:
        while (src < buf + buf_size) {
            if (st) {
                *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
                        src[0] & 0x0F);
                *samples++ = adpcm_yamaha_expand_nibble(&c->status[1],
                        src[0] >> 4  );
            } else {
                *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
                        src[0] & 0x0F);
                *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],
                        src[0] >> 4  );
            }
            src++;
        }
        break;
    case CODEC_ID_ADPCM_THP:
    {
        int table[2][16];
        unsigned int samplecnt;
        int prev[2][2];
        int ch;
        if (buf_size < 80) {
            av_log(avctx, AV_LOG_ERROR, "frame too small\n");
            return -1;
        }
        src+=4;
        samplecnt = bytestream_get_be32(&src);
        for (i = 0; i < 32; i++)
            table[0][i] = (int16_t)bytestream_get_be16(&src);
        for (i = 0; i < 4; i++)
            prev[0][i] = (int16_t)bytestream_get_be16(&src);
        if (samplecnt >= (samples_end - samples) /  (st + 1)) {
            av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\n");
            return -1;
        }
        for (ch = 0; ch <= st; ch++) {
            samples = (unsigned short *) data + ch;
            for (i = 0; i < samplecnt / 14; i++) {
                int index = (*src >> 4) & 7;
                unsigned int exp = 28 - (*src++ & 15);
                int factor1 = table[ch][index * 2];
                int factor2 = table[ch][index * 2 + 1];
                for (n = 0; n < 14; n++) {
                    int32_t sampledat;
                    if(n&1) sampledat=  *src++    <<28;
                    else    sampledat= (*src&0xF0)<<24;
                    sampledat = ((prev[ch][0]*factor1
                                + prev[ch][1]*factor2) >> 11) + (sampledat>>exp);
                    *samples = av_clip_int16(sampledat);
                    prev[ch][1] = prev[ch][0];
                    prev[ch][0] = *samples++;
                    samples += st;
                }
            }
        }
        samples -= st;
        break;
    }
    default:
        return -1;
    }
    *data_size = (uint8_t *)samples - (uint8_t *)data;
    return src - buf;
}
['static int adpcm_decode_frame(AVCodecContext *avctx,\n                            void *data, int *data_size,\n                            AVPacket *avpkt)\n{\n    const uint8_t *buf = avpkt->data;\n    int buf_size = avpkt->size;\n    ADPCMContext *c = avctx->priv_data;\n    ADPCMChannelStatus *cs;\n    int n, m, channel, i;\n    int block_predictor[2];\n    short *samples;\n    short *samples_end;\n    const uint8_t *src;\n    int st;\n    unsigned char last_byte = 0;\n    unsigned char nibble;\n    int decode_top_nibble_next = 0;\n    int diff_channel;\n    uint32_t samples_in_chunk;\n    int32_t previous_left_sample, previous_right_sample;\n    int32_t current_left_sample, current_right_sample;\n    int32_t next_left_sample, next_right_sample;\n    int32_t coeff1l, coeff2l, coeff1r, coeff2r;\n    uint8_t shift_left, shift_right;\n    int count1, count2;\n    int coeff[2][2], shift[2];\n    if (!buf_size)\n        return 0;\n    if(*data_size/4 < buf_size + 8)\n        return -1;\n    samples = data;\n    samples_end= samples + *data_size/2;\n    *data_size= 0;\n    src = buf;\n    st = avctx->channels == 2 ? 1 : 0;\n    switch(avctx->codec->id) {\n    case CODEC_ID_ADPCM_IMA_QT:\n        n = buf_size - 2*avctx->channels;\n        for (channel = 0; channel < avctx->channels; channel++) {\n            cs = &(c->status[channel]);\n            cs->predictor = (*src++) << 8;\n            cs->predictor |= (*src & 0x80);\n            cs->predictor &= 0xFF80;\n            if(cs->predictor & 0x8000)\n                cs->predictor -= 0x10000;\n            cs->predictor = av_clip_int16(cs->predictor);\n            cs->step_index = (*src++) & 0x7F;\n            if (cs->step_index > 88){\n                av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\\n", cs->step_index);\n                cs->step_index = 88;\n            }\n            cs->step = step_table[cs->step_index];\n            samples = (short*)data + channel;\n            for(m=32; n>0 && m>0; n--, m--) {\n                *samples = adpcm_ima_expand_nibble(cs, src[0] & 0x0F, 3);\n                samples += avctx->channels;\n                *samples = adpcm_ima_expand_nibble(cs, src[0] >> 4  , 3);\n                samples += avctx->channels;\n                src ++;\n            }\n        }\n        if (st)\n            samples--;\n        break;\n    case CODEC_ID_ADPCM_IMA_WAV:\n        if (avctx->block_align != 0 && buf_size > avctx->block_align)\n            buf_size = avctx->block_align;\n        for(i=0; i<avctx->channels; i++){\n            cs = &(c->status[i]);\n            cs->predictor = *samples++ = (int16_t)bytestream_get_le16(&src);\n            cs->step_index = *src++;\n            if (cs->step_index > 88){\n                av_log(avctx, AV_LOG_ERROR, "ERROR: step_index = %i\\n", cs->step_index);\n                cs->step_index = 88;\n            }\n            if (*src++) av_log(avctx, AV_LOG_ERROR, "unused byte should be null but is %d!!\\n", src[-1]);\n        }\n        while(src < buf + buf_size){\n            for(m=0; m<4; m++){\n                for(i=0; i<=st; i++)\n                    *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] & 0x0F, 3);\n                for(i=0; i<=st; i++)\n                    *samples++ = adpcm_ima_expand_nibble(&c->status[i], src[4*i] >> 4  , 3);\n                src++;\n            }\n            src += 4*st;\n        }\n        break;\n    case CODEC_ID_ADPCM_4XM:\n        cs = &(c->status[0]);\n        c->status[0].predictor= (int16_t)bytestream_get_le16(&src);\n        if(st){\n            c->status[1].predictor= (int16_t)bytestream_get_le16(&src);\n        }\n        c->status[0].step_index= (int16_t)bytestream_get_le16(&src);\n        if(st){\n            c->status[1].step_index= (int16_t)bytestream_get_le16(&src);\n        }\n        if (cs->step_index < 0) cs->step_index = 0;\n        if (cs->step_index > 88) cs->step_index = 88;\n        m= (buf_size - (src - buf))>>st;\n        for(i=0; i<m; i++) {\n            *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] & 0x0F, 4);\n            if (st)\n                *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] & 0x0F, 4);\n            *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[i] >> 4, 4);\n            if (st)\n                *samples++ = adpcm_ima_expand_nibble(&c->status[1], src[i+m] >> 4, 4);\n        }\n        src += m<<st;\n        break;\n    case CODEC_ID_ADPCM_MS:\n        if (avctx->block_align != 0 && buf_size > avctx->block_align)\n            buf_size = avctx->block_align;\n        n = buf_size - 7 * avctx->channels;\n        if (n < 0)\n            return -1;\n        block_predictor[0] = av_clip(*src++, 0, 6);\n        block_predictor[1] = 0;\n        if (st)\n            block_predictor[1] = av_clip(*src++, 0, 6);\n        c->status[0].idelta = (int16_t)bytestream_get_le16(&src);\n        if (st){\n            c->status[1].idelta = (int16_t)bytestream_get_le16(&src);\n        }\n        c->status[0].coeff1 = AdaptCoeff1[block_predictor[0]];\n        c->status[0].coeff2 = AdaptCoeff2[block_predictor[0]];\n        c->status[1].coeff1 = AdaptCoeff1[block_predictor[1]];\n        c->status[1].coeff2 = AdaptCoeff2[block_predictor[1]];\n        c->status[0].sample1 = bytestream_get_le16(&src);\n        if (st) c->status[1].sample1 = bytestream_get_le16(&src);\n        c->status[0].sample2 = bytestream_get_le16(&src);\n        if (st) c->status[1].sample2 = bytestream_get_le16(&src);\n        *samples++ = c->status[0].sample2;\n        if (st) *samples++ = c->status[1].sample2;\n        *samples++ = c->status[0].sample1;\n        if (st) *samples++ = c->status[1].sample1;\n        for(;n>0;n--) {\n            *samples++ = adpcm_ms_expand_nibble(&c->status[0 ], src[0] >> 4  );\n            *samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);\n            src ++;\n        }\n        break;\n    case CODEC_ID_ADPCM_IMA_DK4:\n        if (avctx->block_align != 0 && buf_size > avctx->block_align)\n            buf_size = avctx->block_align;\n        c->status[0].predictor  = (int16_t)bytestream_get_le16(&src);\n        c->status[0].step_index = *src++;\n        src++;\n        *samples++ = c->status[0].predictor;\n        if (st) {\n            c->status[1].predictor  = (int16_t)bytestream_get_le16(&src);\n            c->status[1].step_index = *src++;\n            src++;\n            *samples++ = c->status[1].predictor;\n        }\n        while (src < buf + buf_size) {\n            *samples++ = adpcm_ima_expand_nibble(&c->status[0],\n                src[0] >> 4, 3);\n            if (st)\n                *samples++ = adpcm_ima_expand_nibble(&c->status[1],\n                    src[0] & 0x0F, 3);\n            else\n                *samples++ = adpcm_ima_expand_nibble(&c->status[0],\n                    src[0] & 0x0F, 3);\n            src++;\n        }\n        break;\n    case CODEC_ID_ADPCM_IMA_DK3:\n        if (avctx->block_align != 0 && buf_size > avctx->block_align)\n            buf_size = avctx->block_align;\n        if(buf_size + 16 > (samples_end - samples)*3/8)\n            return -1;\n        c->status[0].predictor  = (int16_t)AV_RL16(src + 10);\n        c->status[1].predictor  = (int16_t)AV_RL16(src + 12);\n        c->status[0].step_index = src[14];\n        c->status[1].step_index = src[15];\n        src += 16;\n        diff_channel = c->status[1].predictor;\n        while (1) {\n            DK3_GET_NEXT_NIBBLE();\n            adpcm_ima_expand_nibble(&c->status[0], nibble, 3);\n            DK3_GET_NEXT_NIBBLE();\n            adpcm_ima_expand_nibble(&c->status[1], nibble, 3);\n            diff_channel = (diff_channel + c->status[1].predictor) / 2;\n            *samples++ = c->status[0].predictor + c->status[1].predictor;\n            *samples++ = c->status[0].predictor - c->status[1].predictor;\n            DK3_GET_NEXT_NIBBLE();\n            adpcm_ima_expand_nibble(&c->status[0], nibble, 3);\n            diff_channel = (diff_channel + c->status[1].predictor) / 2;\n            *samples++ = c->status[0].predictor + c->status[1].predictor;\n            *samples++ = c->status[0].predictor - c->status[1].predictor;\n        }\n        break;\n    case CODEC_ID_ADPCM_IMA_ISS:\n        c->status[0].predictor  = (int16_t)AV_RL16(src + 0);\n        c->status[0].step_index = src[2];\n        src += 4;\n        if(st) {\n            c->status[1].predictor  = (int16_t)AV_RL16(src + 0);\n            c->status[1].step_index = src[2];\n            src += 4;\n        }\n        while (src < buf + buf_size) {\n            if (st) {\n                *samples++ = adpcm_ima_expand_nibble(&c->status[0],\n                    src[0] >> 4  , 3);\n                *samples++ = adpcm_ima_expand_nibble(&c->status[1],\n                    src[0] & 0x0F, 3);\n            } else {\n                *samples++ = adpcm_ima_expand_nibble(&c->status[0],\n                    src[0] & 0x0F, 3);\n                *samples++ = adpcm_ima_expand_nibble(&c->status[0],\n                    src[0] >> 4  , 3);\n            }\n            src++;\n        }\n        break;\n    case CODEC_ID_ADPCM_IMA_WS:\n        while (src < buf + buf_size) {\n            if (st) {\n                *samples++ = adpcm_ima_expand_nibble(&c->status[0],\n                    src[0] >> 4  , 3);\n                *samples++ = adpcm_ima_expand_nibble(&c->status[1],\n                    src[0] & 0x0F, 3);\n            } else {\n                *samples++ = adpcm_ima_expand_nibble(&c->status[0],\n                    src[0] >> 4  , 3);\n                *samples++ = adpcm_ima_expand_nibble(&c->status[0],\n                    src[0] & 0x0F, 3);\n            }\n            src++;\n        }\n        break;\n    case CODEC_ID_ADPCM_XA:\n        while (buf_size >= 128) {\n            xa_decode(samples, src, &c->status[0], &c->status[1],\n                avctx->channels);\n            src += 128;\n            samples += 28 * 8;\n            buf_size -= 128;\n        }\n        break;\n    case CODEC_ID_ADPCM_IMA_EA_EACS:\n        samples_in_chunk = bytestream_get_le32(&src) >> (1-st);\n        if (samples_in_chunk > buf_size-4-(8<<st)) {\n            src += buf_size - 4;\n            break;\n        }\n        for (i=0; i<=st; i++)\n            c->status[i].step_index = bytestream_get_le32(&src);\n        for (i=0; i<=st; i++)\n            c->status[i].predictor  = bytestream_get_le32(&src);\n        for (; samples_in_chunk; samples_in_chunk--, src++) {\n            *samples++ = adpcm_ima_expand_nibble(&c->status[0],  *src>>4,   3);\n            *samples++ = adpcm_ima_expand_nibble(&c->status[st], *src&0x0F, 3);\n        }\n        break;\n    case CODEC_ID_ADPCM_IMA_EA_SEAD:\n        for (; src < buf+buf_size; src++) {\n            *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] >> 4, 6);\n            *samples++ = adpcm_ima_expand_nibble(&c->status[st],src[0]&0x0F, 6);\n        }\n        break;\n    case CODEC_ID_ADPCM_EA:\n        samples_in_chunk = AV_RL32(src);\n        if (samples_in_chunk >= ((buf_size - 12) * 2)) {\n            src += buf_size;\n            break;\n        }\n        src += 4;\n        current_left_sample   = (int16_t)bytestream_get_le16(&src);\n        previous_left_sample  = (int16_t)bytestream_get_le16(&src);\n        current_right_sample  = (int16_t)bytestream_get_le16(&src);\n        previous_right_sample = (int16_t)bytestream_get_le16(&src);\n        for (count1 = 0; count1 < samples_in_chunk/28;count1++) {\n            coeff1l = ea_adpcm_table[ *src >> 4       ];\n            coeff2l = ea_adpcm_table[(*src >> 4  ) + 4];\n            coeff1r = ea_adpcm_table[*src & 0x0F];\n            coeff2r = ea_adpcm_table[(*src & 0x0F) + 4];\n            src++;\n            shift_left  = (*src >> 4  ) + 8;\n            shift_right = (*src & 0x0F) + 8;\n            src++;\n            for (count2 = 0; count2 < 28; count2++) {\n                next_left_sample  = (int32_t)((*src & 0xF0) << 24) >> shift_left;\n                next_right_sample = (int32_t)((*src & 0x0F) << 28) >> shift_right;\n                src++;\n                next_left_sample = (next_left_sample +\n                    (current_left_sample * coeff1l) +\n                    (previous_left_sample * coeff2l) + 0x80) >> 8;\n                next_right_sample = (next_right_sample +\n                    (current_right_sample * coeff1r) +\n                    (previous_right_sample * coeff2r) + 0x80) >> 8;\n                previous_left_sample = current_left_sample;\n                current_left_sample = av_clip_int16(next_left_sample);\n                previous_right_sample = current_right_sample;\n                current_right_sample = av_clip_int16(next_right_sample);\n                *samples++ = (unsigned short)current_left_sample;\n                *samples++ = (unsigned short)current_right_sample;\n            }\n        }\n        break;\n    case CODEC_ID_ADPCM_EA_MAXIS_XA:\n        for(channel = 0; channel < avctx->channels; channel++) {\n            for (i=0; i<2; i++)\n                coeff[channel][i] = ea_adpcm_table[(*src >> 4) + 4*i];\n            shift[channel] = (*src & 0x0F) + 8;\n            src++;\n        }\n        for (count1 = 0; count1 < (buf_size - avctx->channels) / avctx->channels; count1++) {\n            for(i = 4; i >= 0; i-=4) {\n                for(channel = 0; channel < avctx->channels; channel++) {\n                    int32_t sample = (int32_t)(((*(src+channel) >> i) & 0x0F) << 0x1C) >> shift[channel];\n                    sample = (sample +\n                             c->status[channel].sample1 * coeff[channel][0] +\n                             c->status[channel].sample2 * coeff[channel][1] + 0x80) >> 8;\n                    c->status[channel].sample2 = c->status[channel].sample1;\n                    c->status[channel].sample1 = av_clip_int16(sample);\n                    *samples++ = c->status[channel].sample1;\n                }\n            }\n            src+=avctx->channels;\n        }\n        break;\n    case CODEC_ID_ADPCM_EA_R1:\n    case CODEC_ID_ADPCM_EA_R2:\n    case CODEC_ID_ADPCM_EA_R3: {\n        const int big_endian = avctx->codec->id == CODEC_ID_ADPCM_EA_R3;\n        int32_t previous_sample, current_sample, next_sample;\n        int32_t coeff1, coeff2;\n        uint8_t shift;\n        unsigned int channel;\n        uint16_t *samplesC;\n        const uint8_t *srcC;\n        const uint8_t *src_end = buf + buf_size;\n        samples_in_chunk = (big_endian ? bytestream_get_be32(&src)\n                                       : bytestream_get_le32(&src)) / 28;\n        if (samples_in_chunk > UINT32_MAX/(28*avctx->channels) ||\n            28*samples_in_chunk*avctx->channels > samples_end-samples) {\n            src += buf_size - 4;\n            break;\n        }\n        for (channel=0; channel<avctx->channels; channel++) {\n            int32_t offset = (big_endian ? bytestream_get_be32(&src)\n                                         : bytestream_get_le32(&src))\n                           + (avctx->channels-channel-1) * 4;\n            if ((offset < 0) || (offset >= src_end - src - 4)) break;\n            srcC  = src + offset;\n            samplesC = samples + channel;\n            if (avctx->codec->id == CODEC_ID_ADPCM_EA_R1) {\n                current_sample  = (int16_t)bytestream_get_le16(&srcC);\n                previous_sample = (int16_t)bytestream_get_le16(&srcC);\n            } else {\n                current_sample  = c->status[channel].predictor;\n                previous_sample = c->status[channel].prev_sample;\n            }\n            for (count1=0; count1<samples_in_chunk; count1++) {\n                if (*srcC == 0xEE) {\n                    srcC++;\n                    if (srcC > src_end - 30*2) break;\n                    current_sample  = (int16_t)bytestream_get_be16(&srcC);\n                    previous_sample = (int16_t)bytestream_get_be16(&srcC);\n                    for (count2=0; count2<28; count2++) {\n                        *samplesC = (int16_t)bytestream_get_be16(&srcC);\n                        samplesC += avctx->channels;\n                    }\n                } else {\n                    coeff1 = ea_adpcm_table[ *srcC>>4     ];\n                    coeff2 = ea_adpcm_table[(*srcC>>4) + 4];\n                    shift = (*srcC++ & 0x0F) + 8;\n                    if (srcC > src_end - 14) break;\n                    for (count2=0; count2<28; count2++) {\n                        if (count2 & 1)\n                            next_sample = (int32_t)((*srcC++ & 0x0F) << 28) >> shift;\n                        else\n                            next_sample = (int32_t)((*srcC   & 0xF0) << 24) >> shift;\n                        next_sample += (current_sample  * coeff1) +\n                                       (previous_sample * coeff2);\n                        next_sample = av_clip_int16(next_sample >> 8);\n                        previous_sample = current_sample;\n                        current_sample  = next_sample;\n                        *samplesC = current_sample;\n                        samplesC += avctx->channels;\n                    }\n                }\n            }\n            if (avctx->codec->id != CODEC_ID_ADPCM_EA_R1) {\n                c->status[channel].predictor   = current_sample;\n                c->status[channel].prev_sample = previous_sample;\n            }\n        }\n        src = src + buf_size - (4 + 4*avctx->channels);\n        samples += 28 * samples_in_chunk * avctx->channels;\n        break;\n    }\n    case CODEC_ID_ADPCM_EA_XAS:\n        if (samples_end-samples < 32*4*avctx->channels\n            || buf_size < (4+15)*4*avctx->channels) {\n            src += buf_size;\n            break;\n        }\n        for (channel=0; channel<avctx->channels; channel++) {\n            int coeff[2][4], shift[4];\n            short *s2, *s = &samples[channel];\n            for (n=0; n<4; n++, s+=32*avctx->channels) {\n                for (i=0; i<2; i++)\n                    coeff[i][n] = ea_adpcm_table[(src[0]&0x0F)+4*i];\n                shift[n] = (src[2]&0x0F) + 8;\n                for (s2=s, i=0; i<2; i++, src+=2, s2+=avctx->channels)\n                    s2[0] = (src[0]&0xF0) + (src[1]<<8);\n            }\n            for (m=2; m<32; m+=2) {\n                s = &samples[m*avctx->channels + channel];\n                for (n=0; n<4; n++, src++, s+=32*avctx->channels) {\n                    for (s2=s, i=0; i<8; i+=4, s2+=avctx->channels) {\n                        int level = (int32_t)((*src & (0xF0>>i)) << (24+i)) >> shift[n];\n                        int pred  = s2[-1*avctx->channels] * coeff[0][n]\n                                  + s2[-2*avctx->channels] * coeff[1][n];\n                        s2[0] = av_clip_int16((level + pred + 0x80) >> 8);\n                    }\n                }\n            }\n        }\n        samples += 32*4*avctx->channels;\n        break;\n    case CODEC_ID_ADPCM_IMA_AMV:\n    case CODEC_ID_ADPCM_IMA_SMJPEG:\n        c->status[0].predictor = (int16_t)bytestream_get_le16(&src);\n        c->status[0].step_index = bytestream_get_le16(&src);\n        if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)\n            src+=4;\n        while (src < buf + buf_size) {\n            char hi, lo;\n            lo = *src & 0x0F;\n            hi = *src >> 4;\n            if (avctx->codec->id == CODEC_ID_ADPCM_IMA_AMV)\n                FFSWAP(char, hi, lo);\n            *samples++ = adpcm_ima_expand_nibble(&c->status[0],\n                lo, 3);\n            *samples++ = adpcm_ima_expand_nibble(&c->status[0],\n                hi, 3);\n            src++;\n        }\n        break;\n    case CODEC_ID_ADPCM_CT:\n        while (src < buf + buf_size) {\n            if (st) {\n                *samples++ = adpcm_ct_expand_nibble(&c->status[0],\n                    src[0] >> 4);\n                *samples++ = adpcm_ct_expand_nibble(&c->status[1],\n                    src[0] & 0x0F);\n            } else {\n                *samples++ = adpcm_ct_expand_nibble(&c->status[0],\n                    src[0] >> 4);\n                *samples++ = adpcm_ct_expand_nibble(&c->status[0],\n                    src[0] & 0x0F);\n            }\n            src++;\n        }\n        break;\n    case CODEC_ID_ADPCM_SBPRO_4:\n    case CODEC_ID_ADPCM_SBPRO_3:\n    case CODEC_ID_ADPCM_SBPRO_2:\n        if (!c->status[0].step_index) {\n            *samples++ = 128 * (*src++ - 0x80);\n            if (st)\n              *samples++ = 128 * (*src++ - 0x80);\n            c->status[0].step_index = 1;\n        }\n        if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_4) {\n            while (src < buf + buf_size) {\n                *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],\n                    src[0] >> 4, 4, 0);\n                *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],\n                    src[0] & 0x0F, 4, 0);\n                src++;\n            }\n        } else if (avctx->codec->id == CODEC_ID_ADPCM_SBPRO_3) {\n            while (src < buf + buf_size && samples + 2 < samples_end) {\n                *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],\n                     src[0] >> 5        , 3, 0);\n                *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],\n                    (src[0] >> 2) & 0x07, 3, 0);\n                *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],\n                    src[0] & 0x03, 2, 0);\n                src++;\n            }\n        } else {\n            while (src < buf + buf_size && samples + 3 < samples_end) {\n                *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],\n                     src[0] >> 6        , 2, 2);\n                *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],\n                    (src[0] >> 4) & 0x03, 2, 2);\n                *samples++ = adpcm_sbpro_expand_nibble(&c->status[0],\n                    (src[0] >> 2) & 0x03, 2, 2);\n                *samples++ = adpcm_sbpro_expand_nibble(&c->status[st],\n                    src[0] & 0x03, 2, 2);\n                src++;\n            }\n        }\n        break;\n    case CODEC_ID_ADPCM_SWF:\n    {\n        GetBitContext gb;\n        const int *table;\n        int k0, signmask, nb_bits, count;\n        int size = buf_size*8;\n        init_get_bits(&gb, buf, size);\n        nb_bits = get_bits(&gb, 2)+2;\n        table = swf_index_tables[nb_bits-2];\n        k0 = 1 << (nb_bits-2);\n        signmask = 1 << (nb_bits-1);\n        while (get_bits_count(&gb) <= size - 22*avctx->channels) {\n            for (i = 0; i < avctx->channels; i++) {\n                *samples++ = c->status[i].predictor = get_sbits(&gb, 16);\n                c->status[i].step_index = get_bits(&gb, 6);\n            }\n            for (count = 0; get_bits_count(&gb) <= size - nb_bits*avctx->channels && count < 4095; count++) {\n                int i;\n                for (i = 0; i < avctx->channels; i++) {\n                    int delta = get_bits(&gb, nb_bits);\n                    int step = step_table[c->status[i].step_index];\n                    long vpdiff = 0;\n                    int k = k0;\n                    do {\n                        if (delta & k)\n                            vpdiff += step;\n                        step >>= 1;\n                        k >>= 1;\n                    } while(k);\n                    vpdiff += step;\n                    if (delta & signmask)\n                        c->status[i].predictor -= vpdiff;\n                    else\n                        c->status[i].predictor += vpdiff;\n                    c->status[i].step_index += table[delta & (~signmask)];\n                    c->status[i].step_index = av_clip(c->status[i].step_index, 0, 88);\n                    c->status[i].predictor = av_clip_int16(c->status[i].predictor);\n                    *samples++ = c->status[i].predictor;\n                    if (samples >= samples_end) {\n                        av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\\n");\n                        return -1;\n                    }\n                }\n            }\n        }\n        src += buf_size;\n        break;\n    }\n    case CODEC_ID_ADPCM_YAMAHA:\n        while (src < buf + buf_size) {\n            if (st) {\n                *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],\n                        src[0] & 0x0F);\n                *samples++ = adpcm_yamaha_expand_nibble(&c->status[1],\n                        src[0] >> 4  );\n            } else {\n                *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],\n                        src[0] & 0x0F);\n                *samples++ = adpcm_yamaha_expand_nibble(&c->status[0],\n                        src[0] >> 4  );\n            }\n            src++;\n        }\n        break;\n    case CODEC_ID_ADPCM_THP:\n    {\n        int table[2][16];\n        unsigned int samplecnt;\n        int prev[2][2];\n        int ch;\n        if (buf_size < 80) {\n            av_log(avctx, AV_LOG_ERROR, "frame too small\\n");\n            return -1;\n        }\n        src+=4;\n        samplecnt = bytestream_get_be32(&src);\n        for (i = 0; i < 32; i++)\n            table[0][i] = (int16_t)bytestream_get_be16(&src);\n        for (i = 0; i < 4; i++)\n            prev[0][i] = (int16_t)bytestream_get_be16(&src);\n        if (samplecnt >= (samples_end - samples) /  (st + 1)) {\n            av_log(avctx, AV_LOG_ERROR, "allocated output buffer is too small\\n");\n            return -1;\n        }\n        for (ch = 0; ch <= st; ch++) {\n            samples = (unsigned short *) data + ch;\n            for (i = 0; i < samplecnt / 14; i++) {\n                int index = (*src >> 4) & 7;\n                unsigned int exp = 28 - (*src++ & 15);\n                int factor1 = table[ch][index * 2];\n                int factor2 = table[ch][index * 2 + 1];\n                for (n = 0; n < 14; n++) {\n                    int32_t sampledat;\n                    if(n&1) sampledat=  *src++    <<28;\n                    else    sampledat= (*src&0xF0)<<24;\n                    sampledat = ((prev[ch][0]*factor1\n                                + prev[ch][1]*factor2) >> 11) + (sampledat>>exp);\n                    *samples = av_clip_int16(sampledat);\n                    prev[ch][1] = prev[ch][0];\n                    prev[ch][0] = *samples++;\n                    samples += st;\n                }\n            }\n        }\n        samples -= st;\n        break;\n    }\n    default:\n        return -1;\n    }\n    *data_size = (uint8_t *)samples - (uint8_t *)data;\n    return src - buf;\n}']