int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples,
                               enum AVSampleFormat sample_fmt, int align)
{
    int line_size;
    int sample_size = av_get_bytes_per_sample(sample_fmt);
    int planar      = av_sample_fmt_is_planar(sample_fmt);
    if (!sample_size || nb_samples <= 0 || nb_channels <= 0)
        return AVERROR(EINVAL);
    if (!align) {
        if (nb_samples > INT_MAX - 31)
            return AVERROR(EINVAL);
        align = 1;
        nb_samples = FFALIGN(nb_samples, 32);
    }
    if (nb_channels > INT_MAX / align ||
        (int64_t)nb_channels * nb_samples > (INT_MAX - (align * nb_channels)) / sample_size)
        return AVERROR(EINVAL);
    line_size = planar ? FFALIGN(nb_samples * sample_size,               align) :
                         FFALIGN(nb_samples * sample_size * nb_channels, align);
    if (linesize)
        *linesize = line_size;
    return planar ? line_size * nb_channels : line_size;
}
['static int dca_decode_frame(AVCodecContext *avctx, void *data,\n                            int *got_frame_ptr, AVPacket *avpkt)\n{\n    AVFrame *frame     = data;\n    const uint8_t *buf = avpkt->data;\n    int buf_size = avpkt->size;\n    int lfe_samples;\n    int num_core_channels = 0;\n    int i, ret;\n    float  **samples_flt;\n    DCAContext *s = avctx->priv_data;\n    int channels, full_channels;\n    int core_ss_end;\n    s->xch_present = 0;\n    s->dca_buffer_size = ff_dca_convert_bitstream(buf, buf_size, s->dca_buffer,\n                                                  DCA_MAX_FRAME_SIZE + DCA_MAX_EXSS_HEADER_SIZE);\n    if (s->dca_buffer_size == AVERROR_INVALIDDATA) {\n        av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\\n");\n        return AVERROR_INVALIDDATA;\n    }\n    init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);\n    if ((ret = dca_parse_frame_header(s)) < 0) {\n        return ret;\n    }\n    avctx->sample_rate = s->sample_rate;\n    avctx->bit_rate    = s->bit_rate;\n    s->profile = FF_PROFILE_DTS;\n    for (i = 0; i < (s->sample_blocks / 8); i++) {\n        if ((ret = dca_decode_block(s, 0, i))) {\n            av_log(avctx, AV_LOG_ERROR, "error decoding block\\n");\n            return ret;\n        }\n    }\n    num_core_channels = s->prim_channels;\n    if (s->ext_coding)\n        s->core_ext_mask = dca_ext_audio_descr_mask[s->ext_descr];\n    else\n        s->core_ext_mask = 0;\n    core_ss_end = FFMIN(s->frame_size, s->dca_buffer_size) * 8;\n    if (s->core_ext_mask < 0 || s->core_ext_mask & DCA_EXT_XCH) {\n        s->core_ext_mask = FFMAX(s->core_ext_mask, 0);\n        skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);\n        while (core_ss_end - get_bits_count(&s->gb) >= 32) {\n            uint32_t bits = get_bits_long(&s->gb, 32);\n            switch (bits) {\n            case 0x5a5a5a5a: {\n                int ext_amode, xch_fsize;\n                s->xch_base_channel = s->prim_channels;\n                xch_fsize = show_bits(&s->gb, 10);\n                if ((s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize) &&\n                    (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + xch_fsize + 1))\n                    continue;\n                skip_bits(&s->gb, 10);\n                s->core_ext_mask |= DCA_EXT_XCH;\n                if ((ext_amode = get_bits(&s->gb, 4)) != 1) {\n                    av_log(avctx, AV_LOG_ERROR, "XCh extension amode %d not"\n                           " supported!\\n", ext_amode);\n                    continue;\n                }\n                dca_parse_audio_coding_header(s, s->xch_base_channel);\n                for (i = 0; i < (s->sample_blocks / 8); i++)\n                    if ((ret = dca_decode_block(s, s->xch_base_channel, i))) {\n                        av_log(avctx, AV_LOG_ERROR, "error decoding XCh extension\\n");\n                        continue;\n                    }\n                s->xch_present = 1;\n                break;\n            }\n            case 0x47004a03:\n                s->core_ext_mask |= DCA_EXT_XXCH;\n                break;\n            case 0x1d95f262: {\n                int fsize96 = show_bits(&s->gb, 12) + 1;\n                if (s->frame_size != (get_bits_count(&s->gb) >> 3) - 4 + fsize96)\n                    continue;\n                av_log(avctx, AV_LOG_DEBUG, "X96 extension found at %d bits\\n",\n                       get_bits_count(&s->gb));\n                skip_bits(&s->gb, 12);\n                av_log(avctx, AV_LOG_DEBUG, "FSIZE96 = %d bytes\\n", fsize96);\n                av_log(avctx, AV_LOG_DEBUG, "REVNO = %d\\n", get_bits(&s->gb, 4));\n                s->core_ext_mask |= DCA_EXT_X96;\n                break;\n            }\n            }\n            skip_bits_long(&s->gb, (-get_bits_count(&s->gb)) & 31);\n        }\n    } else {\n        skip_bits_long(&s->gb, core_ss_end - get_bits_count(&s->gb));\n    }\n    if (s->core_ext_mask & DCA_EXT_X96)\n        s->profile = FF_PROFILE_DTS_96_24;\n    else if (s->core_ext_mask & (DCA_EXT_XCH | DCA_EXT_XXCH))\n        s->profile = FF_PROFILE_DTS_ES;\n    if (s->dca_buffer_size - s->frame_size > 32 &&\n        get_bits_long(&s->gb, 32) == DCA_HD_MARKER)\n        dca_exss_parse_header(s);\n    avctx->profile = s->profile;\n    full_channels = channels = s->prim_channels + !!s->lfe;\n    if (s->amode < 16) {\n        avctx->channel_layout = dca_core_channel_layout[s->amode];\n#if FF_API_REQUEST_CHANNELS\nFF_DISABLE_DEPRECATION_WARNINGS\n        if (s->xch_present && !s->xch_disable &&\n            (!avctx->request_channels ||\n             avctx->request_channels > num_core_channels + !!s->lfe)) {\nFF_ENABLE_DEPRECATION_WARNINGS\n#else\n        if (s->xch_present && !s->xch_disable) {\n#endif\n            avctx->channel_layout |= AV_CH_BACK_CENTER;\n            if (s->lfe) {\n                avctx->channel_layout |= AV_CH_LOW_FREQUENCY;\n                s->channel_order_tab = dca_channel_reorder_lfe_xch[s->amode];\n            } else {\n                s->channel_order_tab = dca_channel_reorder_nolfe_xch[s->amode];\n            }\n        } else {\n            channels = num_core_channels + !!s->lfe;\n            s->xch_present = 0;\n            if (s->lfe) {\n                avctx->channel_layout |= AV_CH_LOW_FREQUENCY;\n                s->channel_order_tab = dca_channel_reorder_lfe[s->amode];\n            } else\n                s->channel_order_tab = dca_channel_reorder_nolfe[s->amode];\n        }\n        if (channels > !!s->lfe &&\n            s->channel_order_tab[channels - 1 - !!s->lfe] < 0)\n            return AVERROR_INVALIDDATA;\n        if (s->prim_channels + !!s->lfe > 2 &&\n            avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {\n            channels = 2;\n            s->output = s->prim_channels == 2 ? s->amode : DCA_STEREO;\n            avctx->channel_layout = AV_CH_LAYOUT_STEREO;\n            if (s->core_downmix && (s->core_downmix_amode == DCA_STEREO ||\n                                    s->core_downmix_amode == DCA_STEREO_TOTAL)) {\n                int sign, code;\n                for (i = 0; i < s->prim_channels + !!s->lfe; i++) {\n                    sign = s->core_downmix_codes[i][0] & 0x100 ? 1 : -1;\n                    code = s->core_downmix_codes[i][0] & 0x0FF;\n                    s->downmix_coef[i][0] = (!code ? 0.0f :\n                                             sign * dca_dmixtable[code - 1]);\n                    sign = s->core_downmix_codes[i][1] & 0x100 ? 1 : -1;\n                    code = s->core_downmix_codes[i][1] & 0x0FF;\n                    s->downmix_coef[i][1] = (!code ? 0.0f :\n                                             sign * dca_dmixtable[code - 1]);\n                }\n                s->output = s->core_downmix_amode;\n            } else {\n                int am = s->amode & DCA_CHANNEL_MASK;\n                if (am >= FF_ARRAY_ELEMS(dca_default_coeffs)) {\n                    av_log(s->avctx, AV_LOG_ERROR,\n                           "Invalid channel mode %d\\n", am);\n                    return AVERROR_INVALIDDATA;\n                }\n                if (s->prim_channels + !!s->lfe >\n                    FF_ARRAY_ELEMS(dca_default_coeffs[0])) {\n                    avpriv_request_sample(s->avctx, "Downmixing %d channels",\n                                          s->prim_channels + !!s->lfe);\n                    return AVERROR_PATCHWELCOME;\n                }\n                for (i = 0; i < s->prim_channels + !!s->lfe; i++) {\n                    s->downmix_coef[i][0] = dca_default_coeffs[am][i][0];\n                    s->downmix_coef[i][1] = dca_default_coeffs[am][i][1];\n                }\n            }\n            av_dlog(s->avctx, "Stereo downmix coeffs:\\n");\n            for (i = 0; i < s->prim_channels + !!s->lfe; i++) {\n                av_dlog(s->avctx, "L, input channel %d = %f\\n", i,\n                        s->downmix_coef[i][0]);\n                av_dlog(s->avctx, "R, input channel %d = %f\\n", i,\n                        s->downmix_coef[i][1]);\n            }\n            av_dlog(s->avctx, "\\n");\n        }\n    } else {\n        av_log(avctx, AV_LOG_ERROR, "Non standard configuration %d !\\n", s->amode);\n        return AVERROR_INVALIDDATA;\n    }\n    avctx->channels = channels;\n    frame->nb_samples = 256 * (s->sample_blocks / 8);\n    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {\n        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\\n");\n        return ret;\n    }\n    samples_flt = (float **)frame->extended_data;\n    if (avctx->channels < full_channels) {\n        ret = av_samples_get_buffer_size(NULL, full_channels - channels,\n                                         frame->nb_samples,\n                                         avctx->sample_fmt, 0);\n        if (ret < 0)\n            return ret;\n        av_fast_malloc(&s->extra_channels_buffer,\n                       &s->extra_channels_buffer_size, ret);\n        if (!s->extra_channels_buffer)\n            return AVERROR(ENOMEM);\n        ret = av_samples_fill_arrays((uint8_t **)s->extra_channels, NULL,\n                                     s->extra_channels_buffer,\n                                     full_channels - channels,\n                                     frame->nb_samples, avctx->sample_fmt, 0);\n        if (ret < 0)\n            return ret;\n    }\n    for (i = 0; i < (s->sample_blocks / 8); i++) {\n        int ch;\n        for (ch = 0; ch < channels; ch++)\n            s->samples_chanptr[ch] = samples_flt[ch] + i * 256;\n        for (; ch < full_channels; ch++)\n            s->samples_chanptr[ch] = s->extra_channels[ch - channels] + i * 256;\n        dca_filter_channels(s, i);\n        if ((s->source_pcm_res & 1) && s->xch_present) {\n            float *back_chan = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel]];\n            float *lt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 2]];\n            float *rt_chan   = s->samples_chanptr[s->channel_order_tab[s->xch_base_channel - 1]];\n            s->fdsp.vector_fmac_scalar(lt_chan, back_chan, -M_SQRT1_2, 256);\n            s->fdsp.vector_fmac_scalar(rt_chan, back_chan, -M_SQRT1_2, 256);\n        }\n    }\n    lfe_samples = 2 * s->lfe * (s->sample_blocks / 8);\n    for (i = 0; i < 2 * s->lfe * 4; i++)\n        s->lfe_data[i] = s->lfe_data[i + lfe_samples];\n    ret = ff_side_data_update_matrix_encoding(frame,\n                                              (s->output & ~DCA_LFE) == DCA_STEREO_TOTAL ?\n                                              AV_MATRIX_ENCODING_DOLBY : AV_MATRIX_ENCODING_NONE);\n    if (ret < 0)\n        return ret;\n    *got_frame_ptr = 1;\n    return buf_size;\n}', 'static int dca_parse_frame_header(DCAContext *s)\n{\n    init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);\n    skip_bits_long(&s->gb, 32);\n    s->frame_type        = get_bits(&s->gb, 1);\n    s->samples_deficit   = get_bits(&s->gb, 5) + 1;\n    s->crc_present       = get_bits(&s->gb, 1);\n    s->sample_blocks     = get_bits(&s->gb, 7) + 1;\n    s->frame_size        = get_bits(&s->gb, 14) + 1;\n    if (s->frame_size < 95)\n        return AVERROR_INVALIDDATA;\n    s->amode             = get_bits(&s->gb, 6);\n    s->sample_rate       = avpriv_dca_sample_rates[get_bits(&s->gb, 4)];\n    if (!s->sample_rate)\n        return AVERROR_INVALIDDATA;\n    s->bit_rate_index    = get_bits(&s->gb, 5);\n    s->bit_rate          = dca_bit_rates[s->bit_rate_index];\n    if (!s->bit_rate)\n        return AVERROR_INVALIDDATA;\n    skip_bits1(&s->gb);\n    s->dynrange          = get_bits(&s->gb, 1);\n    s->timestamp         = get_bits(&s->gb, 1);\n    s->aux_data          = get_bits(&s->gb, 1);\n    s->hdcd              = get_bits(&s->gb, 1);\n    s->ext_descr         = get_bits(&s->gb, 3);\n    s->ext_coding        = get_bits(&s->gb, 1);\n    s->aspf              = get_bits(&s->gb, 1);\n    s->lfe               = get_bits(&s->gb, 2);\n    s->predictor_history = get_bits(&s->gb, 1);\n    if (s->lfe > 2) {\n        av_log(s->avctx, AV_LOG_ERROR, "Invalid LFE value: %d\\n", s->lfe);\n        return AVERROR_INVALIDDATA;\n    }\n    if (s->crc_present)\n        s->header_crc    = get_bits(&s->gb, 16);\n    s->multirate_inter   = get_bits(&s->gb, 1);\n    s->version           = get_bits(&s->gb, 4);\n    s->copy_history      = get_bits(&s->gb, 2);\n    s->source_pcm_res    = get_bits(&s->gb, 3);\n    s->front_sum         = get_bits(&s->gb, 1);\n    s->surround_sum      = get_bits(&s->gb, 1);\n    s->dialog_norm       = get_bits(&s->gb, 4);\n    s->output = s->amode;\n    if (s->lfe)\n        s->output |= DCA_LFE;\n#ifdef TRACE\n    av_log(s->avctx, AV_LOG_DEBUG, "frame type: %i\\n", s->frame_type);\n    av_log(s->avctx, AV_LOG_DEBUG, "samples deficit: %i\\n", s->samples_deficit);\n    av_log(s->avctx, AV_LOG_DEBUG, "crc present: %i\\n", s->crc_present);\n    av_log(s->avctx, AV_LOG_DEBUG, "sample blocks: %i (%i samples)\\n",\n           s->sample_blocks, s->sample_blocks * 32);\n    av_log(s->avctx, AV_LOG_DEBUG, "frame size: %i bytes\\n", s->frame_size);\n    av_log(s->avctx, AV_LOG_DEBUG, "amode: %i (%i channels)\\n",\n           s->amode, dca_channels[s->amode]);\n    av_log(s->avctx, AV_LOG_DEBUG, "sample rate: %i Hz\\n",\n           s->sample_rate);\n    av_log(s->avctx, AV_LOG_DEBUG, "bit rate: %i bits/s\\n",\n           s->bit_rate);\n    av_log(s->avctx, AV_LOG_DEBUG, "dynrange: %i\\n", s->dynrange);\n    av_log(s->avctx, AV_LOG_DEBUG, "timestamp: %i\\n", s->timestamp);\n    av_log(s->avctx, AV_LOG_DEBUG, "aux_data: %i\\n", s->aux_data);\n    av_log(s->avctx, AV_LOG_DEBUG, "hdcd: %i\\n", s->hdcd);\n    av_log(s->avctx, AV_LOG_DEBUG, "ext descr: %i\\n", s->ext_descr);\n    av_log(s->avctx, AV_LOG_DEBUG, "ext coding: %i\\n", s->ext_coding);\n    av_log(s->avctx, AV_LOG_DEBUG, "aspf: %i\\n", s->aspf);\n    av_log(s->avctx, AV_LOG_DEBUG, "lfe: %i\\n", s->lfe);\n    av_log(s->avctx, AV_LOG_DEBUG, "predictor history: %i\\n",\n           s->predictor_history);\n    av_log(s->avctx, AV_LOG_DEBUG, "header crc: %i\\n", s->header_crc);\n    av_log(s->avctx, AV_LOG_DEBUG, "multirate inter: %i\\n",\n           s->multirate_inter);\n    av_log(s->avctx, AV_LOG_DEBUG, "version number: %i\\n", s->version);\n    av_log(s->avctx, AV_LOG_DEBUG, "copy history: %i\\n", s->copy_history);\n    av_log(s->avctx, AV_LOG_DEBUG,\n           "source pcm resolution: %i (%i bits/sample)\\n",\n           s->source_pcm_res, dca_bits_per_sample[s->source_pcm_res]);\n    av_log(s->avctx, AV_LOG_DEBUG, "front sum: %i\\n", s->front_sum);\n    av_log(s->avctx, AV_LOG_DEBUG, "surround sum: %i\\n", s->surround_sum);\n    av_log(s->avctx, AV_LOG_DEBUG, "dialog norm: %i\\n", s->dialog_norm);\n    av_log(s->avctx, AV_LOG_DEBUG, "\\n");\n#endif\n    s->subframes         = get_bits(&s->gb, 4) + 1;\n    return dca_parse_audio_coding_header(s, 0);\n}', 'static inline unsigned int get_bits(GetBitContext *s, int n)\n{\n    register int tmp;\n    OPEN_READER(re, s);\n    UPDATE_CACHE(re, s);\n    tmp = SHOW_UBITS(re, s, n);\n    LAST_SKIP_BITS(re, s, n);\n    CLOSE_READER(re, s);\n    return tmp;\n}', 'static av_always_inline av_const uint32_t av_bswap32(uint32_t x)\n{\n    return AV_BSWAP32C(x);\n}', 'int av_samples_fill_arrays(uint8_t **audio_data, int *linesize,\n                           const uint8_t *buf, int nb_channels, int nb_samples,\n                           enum AVSampleFormat sample_fmt, int align)\n{\n    int ch, planar, buf_size, line_size;\n    planar   = av_sample_fmt_is_planar(sample_fmt);\n    buf_size = av_samples_get_buffer_size(&line_size, nb_channels, nb_samples,\n                                          sample_fmt, align);\n    if (buf_size < 0)\n        return buf_size;\n    audio_data[0] = buf;\n    for (ch = 1; planar && ch < nb_channels; ch++)\n        audio_data[ch] = audio_data[ch-1] + line_size;\n    if (linesize)\n        *linesize = line_size;\n    return 0;\n}', 'int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples,\n                               enum AVSampleFormat sample_fmt, int align)\n{\n    int line_size;\n    int sample_size = av_get_bytes_per_sample(sample_fmt);\n    int planar      = av_sample_fmt_is_planar(sample_fmt);\n    if (!sample_size || nb_samples <= 0 || nb_channels <= 0)\n        return AVERROR(EINVAL);\n    if (!align) {\n        if (nb_samples > INT_MAX - 31)\n            return AVERROR(EINVAL);\n        align = 1;\n        nb_samples = FFALIGN(nb_samples, 32);\n    }\n    if (nb_channels > INT_MAX / align ||\n        (int64_t)nb_channels * nb_samples > (INT_MAX - (align * nb_channels)) / sample_size)\n        return AVERROR(EINVAL);\n    line_size = planar ? FFALIGN(nb_samples * sample_size,               align) :\n                         FFALIGN(nb_samples * sample_size * nb_channels, align);\n    if (linesize)\n        *linesize = line_size;\n    return planar ? line_size * nb_channels : line_size;\n}']