| /* | |
| * Bink Audio decoder | |
| * Copyright (c) 2007-2011 Peter Ross (pross@xvid.org) | |
| * Copyright (c) 2009 Daniel Verkamp (daniel@drv.nu) | |
| * | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * FFmpeg is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| /** | |
| * @file | |
| * Bink Audio decoder | |
| * | |
| * Technical details here: | |
| * http://wiki.multimedia.cx/index.php?title=Bink_Audio | |
| */ | |
| #include "config_components.h" | |
| #include "libavutil/channel_layout.h" | |
| #include "libavutil/intfloat.h" | |
| #include "libavutil/mem_internal.h" | |
| #include "libavutil/tx.h" | |
| #define BITSTREAM_READER_LE | |
| #include "avcodec.h" | |
| #include "decode.h" | |
| #include "get_bits.h" | |
| #include "codec_internal.h" | |
| #include "internal.h" | |
| #include "wma_freqs.h" | |
| #define MAX_DCT_CHANNELS 6 | |
| #define MAX_CHANNELS 2 | |
| #define BINK_BLOCK_MAX_SIZE (MAX_CHANNELS << 11) | |
| typedef struct BinkAudioContext { | |
| GetBitContext gb; | |
| int version_b; ///< Bink version 'b' | |
| int first; | |
| int channels; | |
| int ch_offset; | |
| int frame_len; ///< transform size (samples) | |
| int overlap_len; ///< overlap size (samples) | |
| int block_size; | |
| int num_bands; | |
| float root; | |
| unsigned int bands[26]; | |
| float previous[MAX_DCT_CHANNELS][BINK_BLOCK_MAX_SIZE / 16]; ///< coeffs from previous audio block | |
| float quant_table[96]; | |
| AVPacket *pkt; | |
| AVTXContext *tx; | |
| av_tx_fn tx_fn; | |
| } BinkAudioContext; | |
| static av_cold int decode_init(AVCodecContext *avctx) | |
| { | |
| BinkAudioContext *s = avctx->priv_data; | |
| int sample_rate = avctx->sample_rate; | |
| int sample_rate_half; | |
| int i, ret; | |
| int frame_len_bits; | |
| int max_channels = avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT ? MAX_CHANNELS : MAX_DCT_CHANNELS; | |
| int channels = avctx->ch_layout.nb_channels; | |
| /* determine frame length */ | |
| if (avctx->sample_rate < 22050) { | |
| frame_len_bits = 9; | |
| } else if (avctx->sample_rate < 44100) { | |
| frame_len_bits = 10; | |
| } else { | |
| frame_len_bits = 11; | |
| } | |
| if (channels < 1 || channels > max_channels) { | |
| av_log(avctx, AV_LOG_ERROR, "invalid number of channels: %d\n", channels); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| av_channel_layout_uninit(&avctx->ch_layout); | |
| av_channel_layout_default(&avctx->ch_layout, channels); | |
| s->version_b = avctx->extradata_size >= 4 && avctx->extradata[3] == 'b'; | |
| if (avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) { | |
| // audio is already interleaved for the RDFT format variant | |
| avctx->sample_fmt = AV_SAMPLE_FMT_FLT; | |
| if (sample_rate > INT_MAX / channels) | |
| return AVERROR_INVALIDDATA; | |
| sample_rate *= channels; | |
| s->channels = 1; | |
| if (!s->version_b) | |
| frame_len_bits += av_log2(channels); | |
| } else { | |
| s->channels = channels; | |
| avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; | |
| } | |
| s->frame_len = 1 << frame_len_bits; | |
| s->overlap_len = s->frame_len / 16; | |
| s->block_size = (s->frame_len - s->overlap_len) * FFMIN(MAX_CHANNELS, s->channels); | |
| sample_rate_half = (sample_rate + 1LL) / 2; | |
| if (avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) | |
| s->root = 2.0 / (sqrt(s->frame_len) * 32768.0); | |
| else | |
| s->root = s->frame_len / (sqrt(s->frame_len) * 32768.0); | |
| for (i = 0; i < 96; i++) { | |
| /* constant is result of 0.066399999/log10(M_E) */ | |
| s->quant_table[i] = expf(i * 0.15289164787221953823f) * s->root; | |
| } | |
| /* calculate number of bands */ | |
| for (s->num_bands = 1; s->num_bands < 25; s->num_bands++) | |
| if (sample_rate_half <= ff_wma_critical_freqs[s->num_bands - 1]) | |
| break; | |
| /* populate bands data */ | |
| s->bands[0] = 2; | |
| for (i = 1; i < s->num_bands; i++) | |
| s->bands[i] = (ff_wma_critical_freqs[i - 1] * s->frame_len / sample_rate_half) & ~1; | |
| s->bands[s->num_bands] = s->frame_len; | |
| s->first = 1; | |
| if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT) { | |
| float scale = 0.5; | |
| ret = av_tx_init(&s->tx, &s->tx_fn, AV_TX_FLOAT_RDFT, 1, 1 << frame_len_bits, &scale, 0); | |
| } else if (CONFIG_BINKAUDIO_DCT_DECODER) { | |
| float scale = 1.0 / (1 << frame_len_bits); | |
| ret = av_tx_init(&s->tx, &s->tx_fn, AV_TX_FLOAT_DCT, 1, 1 << (frame_len_bits - 1), &scale, 0); | |
| } else { | |
| av_assert0(0); | |
| } | |
| if (ret < 0) | |
| return ret; | |
| s->pkt = avctx->internal->in_pkt; | |
| return 0; | |
| } | |
| static float get_float(GetBitContext *gb) | |
| { | |
| int power = get_bits(gb, 5); | |
| float f = ldexpf(get_bits(gb, 23), power - 23); | |
| if (get_bits1(gb)) | |
| f = -f; | |
| return f; | |
| } | |
| static const uint8_t rle_length_tab[16] = { | |
| 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 32, 64 | |
| }; | |
| /** | |
| * Decode Bink Audio block | |
| * @param[out] out Output buffer (must contain s->block_size elements) | |
| * @return 0 on success, negative error code on failure | |
| */ | |
| static int decode_block(BinkAudioContext *s, float **out, int use_dct, | |
| int channels, int ch_offset) | |
| { | |
| int ch, i, j, k; | |
| float q, quant[25]; | |
| int width, coeff; | |
| GetBitContext *gb = &s->gb; | |
| LOCAL_ALIGNED_32(float, coeffs, [4098]); | |
| if (use_dct) | |
| skip_bits(gb, 2); | |
| for (ch = 0; ch < channels; ch++) { | |
| if (s->version_b) { | |
| if (get_bits_left(gb) < 64) | |
| return AVERROR_INVALIDDATA; | |
| coeffs[0] = av_int2float(get_bits_long(gb, 32)) * s->root; | |
| coeffs[1] = av_int2float(get_bits_long(gb, 32)) * s->root; | |
| } else { | |
| if (get_bits_left(gb) < 58) | |
| return AVERROR_INVALIDDATA; | |
| coeffs[0] = get_float(gb) * s->root; | |
| coeffs[1] = get_float(gb) * s->root; | |
| } | |
| if (get_bits_left(gb) < s->num_bands * 8) | |
| return AVERROR_INVALIDDATA; | |
| for (i = 0; i < s->num_bands; i++) { | |
| int value = get_bits(gb, 8); | |
| quant[i] = s->quant_table[FFMIN(value, 95)]; | |
| } | |
| k = 0; | |
| q = quant[0]; | |
| // parse coefficients | |
| i = 2; | |
| while (i < s->frame_len) { | |
| if (s->version_b) { | |
| j = i + 16; | |
| } else { | |
| int v = get_bits1(gb); | |
| if (v) { | |
| v = get_bits(gb, 4); | |
| j = i + rle_length_tab[v] * 8; | |
| } else { | |
| j = i + 8; | |
| } | |
| } | |
| j = FFMIN(j, s->frame_len); | |
| width = get_bits(gb, 4); | |
| if (width == 0) { | |
| memset(coeffs + i, 0, (j - i) * sizeof(*coeffs)); | |
| i = j; | |
| while (s->bands[k] < i) | |
| q = quant[k++]; | |
| } else { | |
| while (i < j) { | |
| if (s->bands[k] == i) | |
| q = quant[k++]; | |
| coeff = get_bits(gb, width); | |
| if (coeff) { | |
| int v; | |
| v = get_bits1(gb); | |
| if (v) | |
| coeffs[i] = -q * coeff; | |
| else | |
| coeffs[i] = q * coeff; | |
| } else { | |
| coeffs[i] = 0.0f; | |
| } | |
| i++; | |
| } | |
| } | |
| } | |
| if (CONFIG_BINKAUDIO_DCT_DECODER && use_dct) { | |
| coeffs[0] /= 0.5; | |
| s->tx_fn(s->tx, out[ch + ch_offset], coeffs, sizeof(float)); | |
| } else if (CONFIG_BINKAUDIO_RDFT_DECODER) { | |
| for (int i = 2; i < s->frame_len; i += 2) | |
| coeffs[i + 1] *= -1; | |
| coeffs[s->frame_len + 0] = coeffs[1]; | |
| coeffs[s->frame_len + 1] = coeffs[1] = 0; | |
| s->tx_fn(s->tx, out[ch + ch_offset], coeffs, sizeof(AVComplexFloat)); | |
| } | |
| } | |
| for (ch = 0; ch < channels; ch++) { | |
| int j; | |
| int count = s->overlap_len * channels; | |
| if (!s->first) { | |
| j = ch; | |
| for (i = 0; i < s->overlap_len; i++, j += channels) | |
| out[ch + ch_offset][i] = (s->previous[ch + ch_offset][i] * (count - j) + | |
| out[ch + ch_offset][i] * j) / count; | |
| } | |
| memcpy(s->previous[ch + ch_offset], &out[ch + ch_offset][s->frame_len - s->overlap_len], | |
| s->overlap_len * sizeof(*s->previous[ch + ch_offset])); | |
| } | |
| s->first = 0; | |
| return 0; | |
| } | |
| static av_cold int decode_end(AVCodecContext *avctx) | |
| { | |
| BinkAudioContext * s = avctx->priv_data; | |
| av_tx_uninit(&s->tx); | |
| return 0; | |
| } | |
| static void get_bits_align32(GetBitContext *s) | |
| { | |
| int n = (-get_bits_count(s)) & 31; | |
| if (n) skip_bits(s, n); | |
| } | |
| static int binkaudio_receive_frame(AVCodecContext *avctx, AVFrame *frame) | |
| { | |
| BinkAudioContext *s = avctx->priv_data; | |
| GetBitContext *gb = &s->gb; | |
| int new_pkt, ret; | |
| again: | |
| new_pkt = !s->pkt->data; | |
| if (!s->pkt->data) { | |
| ret = ff_decode_get_packet(avctx, s->pkt); | |
| if (ret < 0) { | |
| s->ch_offset = 0; | |
| return ret; | |
| } | |
| if (s->pkt->size < 4) { | |
| av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); | |
| ret = AVERROR_INVALIDDATA; | |
| goto fail; | |
| } | |
| ret = init_get_bits8(gb, s->pkt->data, s->pkt->size); | |
| if (ret < 0) | |
| goto fail; | |
| /* skip reported size */ | |
| skip_bits_long(gb, 32); | |
| } | |
| /* get output buffer */ | |
| if (s->ch_offset == 0) { | |
| frame->nb_samples = s->frame_len; | |
| if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
| goto fail; | |
| if (!new_pkt) | |
| frame->pts = AV_NOPTS_VALUE; | |
| } | |
| if (decode_block(s, (float **)frame->extended_data, | |
| avctx->codec->id == AV_CODEC_ID_BINKAUDIO_DCT, | |
| FFMIN(MAX_CHANNELS, s->channels - s->ch_offset), s->ch_offset)) { | |
| av_log(avctx, AV_LOG_ERROR, "Incomplete packet\n"); | |
| ret = AVERROR_INVALIDDATA; | |
| goto fail; | |
| } | |
| s->ch_offset += MAX_CHANNELS; | |
| get_bits_align32(gb); | |
| if (!get_bits_left(gb)) { | |
| memset(gb, 0, sizeof(*gb)); | |
| av_packet_unref(s->pkt); | |
| } | |
| if (s->ch_offset >= s->channels) { | |
| s->ch_offset = 0; | |
| } else { | |
| goto again; | |
| } | |
| frame->nb_samples = s->block_size / FFMIN(avctx->ch_layout.nb_channels, MAX_CHANNELS); | |
| return 0; | |
| fail: | |
| s->ch_offset = 0; | |
| av_packet_unref(s->pkt); | |
| return ret; | |
| } | |
| static void decode_flush(AVCodecContext *avctx) | |
| { | |
| BinkAudioContext *const s = avctx->priv_data; | |
| /* s->pkt coincides with avctx->internal->in_pkt | |
| * and is unreferenced generically when flushing. */ | |
| s->first = 1; | |
| s->ch_offset = 0; | |
| } | |
| const FFCodec ff_binkaudio_rdft_decoder = { | |
| .p.name = "binkaudio_rdft", | |
| CODEC_LONG_NAME("Bink Audio (RDFT)"), | |
| .p.type = AVMEDIA_TYPE_AUDIO, | |
| .p.id = AV_CODEC_ID_BINKAUDIO_RDFT, | |
| .priv_data_size = sizeof(BinkAudioContext), | |
| .init = decode_init, | |
| .flush = decode_flush, | |
| .close = decode_end, | |
| FF_CODEC_RECEIVE_FRAME_CB(binkaudio_receive_frame), | |
| .p.capabilities = AV_CODEC_CAP_DR1, | |
| .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | |
| }; | |
| const FFCodec ff_binkaudio_dct_decoder = { | |
| .p.name = "binkaudio_dct", | |
| CODEC_LONG_NAME("Bink Audio (DCT)"), | |
| .p.type = AVMEDIA_TYPE_AUDIO, | |
| .p.id = AV_CODEC_ID_BINKAUDIO_DCT, | |
| .priv_data_size = sizeof(BinkAudioContext), | |
| .init = decode_init, | |
| .flush = decode_flush, | |
| .close = decode_end, | |
| FF_CODEC_RECEIVE_FRAME_CB(binkaudio_receive_frame), | |
| .p.capabilities = AV_CODEC_CAP_DR1, | |
| .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | |
| }; |