| /* |
| * ATRAC3+ compatible decoder |
| * |
| * Copyright (c) 2010-2013 Maxim Poliakovski |
| * |
| * 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 |
| * Sony ATRAC3+ compatible decoder. |
| * |
| * Container formats used to store its data: |
| * RIFF WAV (.at3) and Sony OpenMG (.oma, .aa3). |
| * |
| * Technical description of this codec can be found here: |
| * http://wiki.multimedia.cx/index.php?title=ATRAC3plus |
| * |
| * Kudos to Benjamin Larsson and Michael Karcher |
| * for their precious technical help! |
| */ |
| |
| #include <stdint.h> |
| #include <string.h> |
| |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/float_dsp.h" |
| #include "avcodec.h" |
| #include "get_bits.h" |
| #include "internal.h" |
| #include "atrac.h" |
| #include "atrac3plus.h" |
| |
| typedef struct ATRAC3PContext { |
| GetBitContext gb; |
| AVFloatDSPContext *fdsp; |
| |
| DECLARE_ALIGNED(32, float, samples)[2][ATRAC3P_FRAME_SAMPLES]; ///< quantized MDCT spectrum |
| DECLARE_ALIGNED(32, float, mdct_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< output of the IMDCT |
| DECLARE_ALIGNED(32, float, time_buf)[2][ATRAC3P_FRAME_SAMPLES]; ///< output of the gain compensation |
| DECLARE_ALIGNED(32, float, outp_buf)[2][ATRAC3P_FRAME_SAMPLES]; |
| |
| AtracGCContext gainc_ctx; ///< gain compensation context |
| FFTContext mdct_ctx; |
| FFTContext ipqf_dct_ctx; ///< IDCT context used by IPQF |
| |
| Atrac3pChanUnitCtx *ch_units; ///< global channel units |
| |
| int num_channel_blocks; ///< number of channel blocks |
| uint8_t channel_blocks[5]; ///< channel configuration descriptor |
| uint64_t my_channel_layout; ///< current channel layout |
| } ATRAC3PContext; |
| |
| static av_cold int atrac3p_decode_close(AVCodecContext *avctx) |
| { |
| ATRAC3PContext *ctx = avctx->priv_data; |
| |
| av_freep(&ctx->ch_units); |
| av_freep(&ctx->fdsp); |
| |
| ff_mdct_end(&ctx->mdct_ctx); |
| ff_mdct_end(&ctx->ipqf_dct_ctx); |
| |
| return 0; |
| } |
| |
| static av_cold int set_channel_params(ATRAC3PContext *ctx, |
| AVCodecContext *avctx) |
| { |
| memset(ctx->channel_blocks, 0, sizeof(ctx->channel_blocks)); |
| |
| switch (avctx->channels) { |
| case 1: |
| if (avctx->channel_layout != AV_CH_FRONT_LEFT) |
| avctx->channel_layout = AV_CH_LAYOUT_MONO; |
| |
| ctx->num_channel_blocks = 1; |
| ctx->channel_blocks[0] = CH_UNIT_MONO; |
| break; |
| case 2: |
| avctx->channel_layout = AV_CH_LAYOUT_STEREO; |
| ctx->num_channel_blocks = 1; |
| ctx->channel_blocks[0] = CH_UNIT_STEREO; |
| break; |
| case 3: |
| avctx->channel_layout = AV_CH_LAYOUT_SURROUND; |
| ctx->num_channel_blocks = 2; |
| ctx->channel_blocks[0] = CH_UNIT_STEREO; |
| ctx->channel_blocks[1] = CH_UNIT_MONO; |
| break; |
| case 4: |
| avctx->channel_layout = AV_CH_LAYOUT_4POINT0; |
| ctx->num_channel_blocks = 3; |
| ctx->channel_blocks[0] = CH_UNIT_STEREO; |
| ctx->channel_blocks[1] = CH_UNIT_MONO; |
| ctx->channel_blocks[2] = CH_UNIT_MONO; |
| break; |
| case 6: |
| avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK; |
| ctx->num_channel_blocks = 4; |
| ctx->channel_blocks[0] = CH_UNIT_STEREO; |
| ctx->channel_blocks[1] = CH_UNIT_MONO; |
| ctx->channel_blocks[2] = CH_UNIT_STEREO; |
| ctx->channel_blocks[3] = CH_UNIT_MONO; |
| break; |
| case 7: |
| avctx->channel_layout = AV_CH_LAYOUT_6POINT1_BACK; |
| ctx->num_channel_blocks = 5; |
| ctx->channel_blocks[0] = CH_UNIT_STEREO; |
| ctx->channel_blocks[1] = CH_UNIT_MONO; |
| ctx->channel_blocks[2] = CH_UNIT_STEREO; |
| ctx->channel_blocks[3] = CH_UNIT_MONO; |
| ctx->channel_blocks[4] = CH_UNIT_MONO; |
| break; |
| case 8: |
| avctx->channel_layout = AV_CH_LAYOUT_7POINT1; |
| ctx->num_channel_blocks = 5; |
| ctx->channel_blocks[0] = CH_UNIT_STEREO; |
| ctx->channel_blocks[1] = CH_UNIT_MONO; |
| ctx->channel_blocks[2] = CH_UNIT_STEREO; |
| ctx->channel_blocks[3] = CH_UNIT_STEREO; |
| ctx->channel_blocks[4] = CH_UNIT_MONO; |
| break; |
| default: |
| av_log(avctx, AV_LOG_ERROR, |
| "Unsupported channel count: %d!\n", avctx->channels); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| return 0; |
| } |
| |
| static av_cold int atrac3p_decode_init(AVCodecContext *avctx) |
| { |
| ATRAC3PContext *ctx = avctx->priv_data; |
| int i, ch, ret; |
| |
| if (!avctx->block_align) { |
| av_log(avctx, AV_LOG_ERROR, "block_align is not set\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| ff_atrac3p_init_vlcs(); |
| |
| /* initialize IPQF */ |
| ff_mdct_init(&ctx->ipqf_dct_ctx, 5, 1, 32.0 / 32768.0); |
| |
| ff_atrac3p_init_imdct(avctx, &ctx->mdct_ctx); |
| |
| ff_atrac_init_gain_compensation(&ctx->gainc_ctx, 6, 2); |
| |
| ff_atrac3p_init_wave_synth(); |
| |
| if ((ret = set_channel_params(ctx, avctx)) < 0) |
| return ret; |
| |
| ctx->my_channel_layout = avctx->channel_layout; |
| |
| ctx->ch_units = av_mallocz_array(ctx->num_channel_blocks, sizeof(*ctx->ch_units)); |
| ctx->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT); |
| |
| if (!ctx->ch_units || !ctx->fdsp) { |
| atrac3p_decode_close(avctx); |
| return AVERROR(ENOMEM); |
| } |
| |
| for (i = 0; i < ctx->num_channel_blocks; i++) { |
| for (ch = 0; ch < 2; ch++) { |
| ctx->ch_units[i].channels[ch].ch_num = ch; |
| ctx->ch_units[i].channels[ch].wnd_shape = &ctx->ch_units[i].channels[ch].wnd_shape_hist[0][0]; |
| ctx->ch_units[i].channels[ch].wnd_shape_prev = &ctx->ch_units[i].channels[ch].wnd_shape_hist[1][0]; |
| ctx->ch_units[i].channels[ch].gain_data = &ctx->ch_units[i].channels[ch].gain_data_hist[0][0]; |
| ctx->ch_units[i].channels[ch].gain_data_prev = &ctx->ch_units[i].channels[ch].gain_data_hist[1][0]; |
| ctx->ch_units[i].channels[ch].tones_info = &ctx->ch_units[i].channels[ch].tones_info_hist[0][0]; |
| ctx->ch_units[i].channels[ch].tones_info_prev = &ctx->ch_units[i].channels[ch].tones_info_hist[1][0]; |
| } |
| |
| ctx->ch_units[i].waves_info = &ctx->ch_units[i].wave_synth_hist[0]; |
| ctx->ch_units[i].waves_info_prev = &ctx->ch_units[i].wave_synth_hist[1]; |
| } |
| |
| avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; |
| |
| return 0; |
| } |
| |
| static void decode_residual_spectrum(Atrac3pChanUnitCtx *ctx, |
| float out[2][ATRAC3P_FRAME_SAMPLES], |
| int num_channels, |
| AVCodecContext *avctx) |
| { |
| int i, sb, ch, qu, nspeclines, RNG_index; |
| float *dst, q; |
| int16_t *src; |
| /* calculate RNG table index for each subband */ |
| int sb_RNG_index[ATRAC3P_SUBBANDS] = { 0 }; |
| |
| if (ctx->mute_flag) { |
| for (ch = 0; ch < num_channels; ch++) |
| memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch])); |
| return; |
| } |
| |
| for (qu = 0, RNG_index = 0; qu < ctx->used_quant_units; qu++) |
| RNG_index += ctx->channels[0].qu_sf_idx[qu] + |
| ctx->channels[1].qu_sf_idx[qu]; |
| |
| for (sb = 0; sb < ctx->num_coded_subbands; sb++, RNG_index += 128) |
| sb_RNG_index[sb] = RNG_index & 0x3FC; |
| |
| /* inverse quant and power compensation */ |
| for (ch = 0; ch < num_channels; ch++) { |
| /* clear channel's residual spectrum */ |
| memset(out[ch], 0, ATRAC3P_FRAME_SAMPLES * sizeof(*out[ch])); |
| |
| for (qu = 0; qu < ctx->used_quant_units; qu++) { |
| src = &ctx->channels[ch].spectrum[ff_atrac3p_qu_to_spec_pos[qu]]; |
| dst = &out[ch][ff_atrac3p_qu_to_spec_pos[qu]]; |
| nspeclines = ff_atrac3p_qu_to_spec_pos[qu + 1] - |
| ff_atrac3p_qu_to_spec_pos[qu]; |
| |
| if (ctx->channels[ch].qu_wordlen[qu] > 0) { |
| q = ff_atrac3p_sf_tab[ctx->channels[ch].qu_sf_idx[qu]] * |
| ff_atrac3p_mant_tab[ctx->channels[ch].qu_wordlen[qu]]; |
| for (i = 0; i < nspeclines; i++) |
| dst[i] = src[i] * q; |
| } |
| } |
| |
| for (sb = 0; sb < ctx->num_coded_subbands; sb++) |
| ff_atrac3p_power_compensation(ctx, ch, &out[ch][0], |
| sb_RNG_index[sb], sb); |
| } |
| |
| if (ctx->unit_type == CH_UNIT_STEREO) { |
| for (sb = 0; sb < ctx->num_coded_subbands; sb++) { |
| if (ctx->swap_channels[sb]) { |
| for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++) |
| FFSWAP(float, out[0][sb * ATRAC3P_SUBBAND_SAMPLES + i], |
| out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]); |
| } |
| |
| /* flip coefficients' sign if requested */ |
| if (ctx->negate_coeffs[sb]) |
| for (i = 0; i < ATRAC3P_SUBBAND_SAMPLES; i++) |
| out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i] = -(out[1][sb * ATRAC3P_SUBBAND_SAMPLES + i]); |
| } |
| } |
| } |
| |
| static void reconstruct_frame(ATRAC3PContext *ctx, Atrac3pChanUnitCtx *ch_unit, |
| int num_channels, AVCodecContext *avctx) |
| { |
| int ch, sb; |
| |
| for (ch = 0; ch < num_channels; ch++) { |
| for (sb = 0; sb < ch_unit->num_subbands; sb++) { |
| /* inverse transform and windowing */ |
| ff_atrac3p_imdct(ctx->fdsp, &ctx->mdct_ctx, |
| &ctx->samples[ch][sb * ATRAC3P_SUBBAND_SAMPLES], |
| &ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES], |
| (ch_unit->channels[ch].wnd_shape_prev[sb] << 1) + |
| ch_unit->channels[ch].wnd_shape[sb], sb); |
| |
| /* gain compensation and overlapping */ |
| ff_atrac_gain_compensation(&ctx->gainc_ctx, |
| &ctx->mdct_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES], |
| &ch_unit->prev_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES], |
| &ch_unit->channels[ch].gain_data_prev[sb], |
| &ch_unit->channels[ch].gain_data[sb], |
| ATRAC3P_SUBBAND_SAMPLES, |
| &ctx->time_buf[ch][sb * ATRAC3P_SUBBAND_SAMPLES]); |
| } |
| |
| /* zero unused subbands in both output and overlapping buffers */ |
| memset(&ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES], |
| 0, |
| (ATRAC3P_SUBBANDS - ch_unit->num_subbands) * |
| ATRAC3P_SUBBAND_SAMPLES * |
| sizeof(ch_unit->prev_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES])); |
| memset(&ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES], |
| 0, |
| (ATRAC3P_SUBBANDS - ch_unit->num_subbands) * |
| ATRAC3P_SUBBAND_SAMPLES * |
| sizeof(ctx->time_buf[ch][ch_unit->num_subbands * ATRAC3P_SUBBAND_SAMPLES])); |
| |
| /* resynthesize and add tonal signal */ |
| if (ch_unit->waves_info->tones_present || |
| ch_unit->waves_info_prev->tones_present) { |
| for (sb = 0; sb < ch_unit->num_subbands; sb++) |
| if (ch_unit->channels[ch].tones_info[sb].num_wavs || |
| ch_unit->channels[ch].tones_info_prev[sb].num_wavs) { |
| ff_atrac3p_generate_tones(ch_unit, ctx->fdsp, ch, sb, |
| &ctx->time_buf[ch][sb * 128]); |
| } |
| } |
| |
| /* subband synthesis and acoustic signal output */ |
| ff_atrac3p_ipqf(&ctx->ipqf_dct_ctx, &ch_unit->ipqf_ctx[ch], |
| &ctx->time_buf[ch][0], &ctx->outp_buf[ch][0]); |
| } |
| |
| /* swap window shape and gain control buffers. */ |
| for (ch = 0; ch < num_channels; ch++) { |
| FFSWAP(uint8_t *, ch_unit->channels[ch].wnd_shape, |
| ch_unit->channels[ch].wnd_shape_prev); |
| FFSWAP(AtracGainInfo *, ch_unit->channels[ch].gain_data, |
| ch_unit->channels[ch].gain_data_prev); |
| FFSWAP(Atrac3pWavesData *, ch_unit->channels[ch].tones_info, |
| ch_unit->channels[ch].tones_info_prev); |
| } |
| |
| FFSWAP(Atrac3pWaveSynthParams *, ch_unit->waves_info, ch_unit->waves_info_prev); |
| } |
| |
| static int atrac3p_decode_frame(AVCodecContext *avctx, void *data, |
| int *got_frame_ptr, AVPacket *avpkt) |
| { |
| ATRAC3PContext *ctx = avctx->priv_data; |
| AVFrame *frame = data; |
| int i, ret, ch_unit_id, ch_block = 0, out_ch_index = 0, channels_to_process; |
| float **samples_p = (float **)frame->extended_data; |
| |
| frame->nb_samples = ATRAC3P_FRAME_SAMPLES; |
| if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| return ret; |
| |
| if ((ret = init_get_bits8(&ctx->gb, avpkt->data, avpkt->size)) < 0) |
| return ret; |
| |
| if (get_bits1(&ctx->gb)) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid start bit!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| while (get_bits_left(&ctx->gb) >= 2 && |
| (ch_unit_id = get_bits(&ctx->gb, 2)) != CH_UNIT_TERMINATOR) { |
| if (ch_unit_id == CH_UNIT_EXTENSION) { |
| avpriv_report_missing_feature(avctx, "Channel unit extension"); |
| return AVERROR_PATCHWELCOME; |
| } |
| if (ch_block >= ctx->num_channel_blocks || |
| ctx->channel_blocks[ch_block] != ch_unit_id) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Frame data doesn't match channel configuration!\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| ctx->ch_units[ch_block].unit_type = ch_unit_id; |
| channels_to_process = ch_unit_id + 1; |
| |
| if ((ret = ff_atrac3p_decode_channel_unit(&ctx->gb, |
| &ctx->ch_units[ch_block], |
| channels_to_process, |
| avctx)) < 0) |
| return ret; |
| |
| decode_residual_spectrum(&ctx->ch_units[ch_block], ctx->samples, |
| channels_to_process, avctx); |
| reconstruct_frame(ctx, &ctx->ch_units[ch_block], |
| channels_to_process, avctx); |
| |
| for (i = 0; i < channels_to_process; i++) |
| memcpy(samples_p[out_ch_index + i], ctx->outp_buf[i], |
| ATRAC3P_FRAME_SAMPLES * sizeof(**samples_p)); |
| |
| ch_block++; |
| out_ch_index += channels_to_process; |
| } |
| |
| *got_frame_ptr = 1; |
| |
| return FFMIN(avctx->block_align, avpkt->size); |
| } |
| |
| AVCodec ff_atrac3p_decoder = { |
| .name = "atrac3plus", |
| .long_name = NULL_IF_CONFIG_SMALL("ATRAC3+ (Adaptive TRansform Acoustic Coding 3+)"), |
| .type = AVMEDIA_TYPE_AUDIO, |
| .id = AV_CODEC_ID_ATRAC3P, |
| .capabilities = AV_CODEC_CAP_DR1, |
| .priv_data_size = sizeof(ATRAC3PContext), |
| .init = atrac3p_decode_init, |
| .close = atrac3p_decode_close, |
| .decode = atrac3p_decode_frame, |
| }; |
