static int twinvq_read_bitstream(AVCodecContext *avctx, TwinVQContext *tctx, const uint8_t *buf, int buf_size) { TwinVQFrameData *bits = &tctx->bits; const TwinVQModeTab *mtab = tctx->mtab; int channels = tctx->avctx->channels; int sub; GetBitContext gb; int i, j, k; if (buf_size * 8 < avctx->bit_rate * mtab->size / avctx->sample_rate + 8) { av_log(avctx, AV_LOG_ERROR, "Frame too small (%d bytes). Truncated file?\n", buf_size); return AVERROR(EINVAL); } init_get_bits(&gb, buf, buf_size * 8); skip_bits(&gb, get_bits(&gb, 8)); bits->window_type = get_bits(&gb, TWINVQ_WINDOW_TYPE_BITS); if (bits->window_type > 8) { av_log(avctx, AV_LOG_ERROR, "Invalid window type, broken sample?\n"); return AVERROR_INVALIDDATA; } bits->ftype = ff_twinvq_wtype_to_ftype_table[tctx->bits.window_type]; sub = mtab->fmode[bits->ftype].sub; read_cb_data(tctx, &gb, bits->main_coeffs, bits->ftype); for (i = 0; i < channels; i++) for (j = 0; j < sub; j++) for (k = 0; k < mtab->fmode[bits->ftype].bark_n_coef; k++) bits->bark1[i][j][k] = get_bits(&gb, mtab->fmode[bits->ftype].bark_n_bit); for (i = 0; i < channels; i++) for (j = 0; j < sub; j++) bits->bark_use_hist[i][j] = get_bits1(&gb); if (bits->ftype == TWINVQ_FT_LONG) { for (i = 0; i < channels; i++) bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS); } else { for (i = 0; i < channels; i++) { bits->gain_bits[i] = get_bits(&gb, TWINVQ_GAIN_BITS); for (j = 0; j < sub; j++) bits->sub_gain_bits[i * sub + j] = get_bits(&gb, TWINVQ_SUB_GAIN_BITS); } } for (i = 0; i < channels; i++) { bits->lpc_hist_idx[i] = get_bits(&gb, mtab->lsp_bit0); bits->lpc_idx1[i] = get_bits(&gb, mtab->lsp_bit1); for (j = 0; j < mtab->lsp_split; j++) bits->lpc_idx2[i][j] = get_bits(&gb, mtab->lsp_bit2); } if (bits->ftype == TWINVQ_FT_LONG) { read_cb_data(tctx, &gb, bits->ppc_coeffs, 3); for (i = 0; i < channels; i++) { bits->p_coef[i] = get_bits(&gb, mtab->ppc_period_bit); bits->g_coef[i] = get_bits(&gb, mtab->pgain_bit); } } return 0; }