| /* | |
| * Musepack SV7 decoder | |
| * Copyright (c) 2006 Konstantin Shishkov | |
| * | |
| * 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 | |
| * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples | |
| * divided into 32 subbands. | |
| */ | |
| #include "libavutil/channel_layout.h" | |
| #include "libavutil/internal.h" | |
| #include "libavutil/lfg.h" | |
| #include "libavutil/mem_internal.h" | |
| #include "libavutil/thread.h" | |
| #include "avcodec.h" | |
| #include "codec_internal.h" | |
| #include "decode.h" | |
| #include "get_bits.h" | |
| #include "mpegaudiodsp.h" | |
| #include "mpc.h" | |
| #include "mpc7data.h" | |
| static VLCElem scfi_vlc[1 << MPC7_SCFI_BITS]; | |
| static VLCElem dscf_vlc[1 << MPC7_DSCF_BITS]; | |
| static VLCElem hdr_vlc [1 << MPC7_HDR_BITS]; | |
| static const VLCElem *quant_vlc[MPC7_QUANT_VLC_TABLES][2]; | |
| static av_cold void mpc7_init_static(void) | |
| { | |
| static VLCElem quant_tables[7224]; | |
| VLCInitState state = VLC_INIT_STATE(quant_tables); | |
| const uint8_t *raw_quant_table = mpc7_quant_vlcs; | |
| VLC_INIT_STATIC_TABLE_FROM_LENGTHS(scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE, | |
| &mpc7_scfi[1], 2, | |
| &mpc7_scfi[0], 2, 1, 0, 0); | |
| VLC_INIT_STATIC_TABLE_FROM_LENGTHS(dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE, | |
| &mpc7_dscf[1], 2, | |
| &mpc7_dscf[0], 2, 1, -7, 0); | |
| VLC_INIT_STATIC_TABLE_FROM_LENGTHS(hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE, | |
| &mpc7_hdr[1], 2, | |
| &mpc7_hdr[0], 2, 1, -5, 0); | |
| for (int i = 0; i < MPC7_QUANT_VLC_TABLES; i++) { | |
| for (int j = 0; j < 2; j++) { | |
| quant_vlc[i][j] = | |
| ff_vlc_init_tables_from_lengths(&state, 9, mpc7_quant_vlc_sizes[i], | |
| &raw_quant_table[1], 2, | |
| &raw_quant_table[0], 2, 1, | |
| mpc7_quant_vlc_off[i], 0); | |
| raw_quant_table += 2 * mpc7_quant_vlc_sizes[i]; | |
| } | |
| } | |
| ff_mpa_synth_init_fixed(); | |
| } | |
| static av_cold int mpc7_decode_init(AVCodecContext * avctx) | |
| { | |
| static AVOnce init_static_once = AV_ONCE_INIT; | |
| MPCContext *c = avctx->priv_data; | |
| GetBitContext gb; | |
| LOCAL_ALIGNED_16(uint8_t, buf, [16]); | |
| /* Musepack SV7 is always stereo */ | |
| if (avctx->ch_layout.nb_channels != 2) { | |
| avpriv_request_sample(avctx, "%d channels", avctx->ch_layout.nb_channels); | |
| return AVERROR_PATCHWELCOME; | |
| } | |
| if(avctx->extradata_size < 16){ | |
| av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); | |
| av_lfg_init(&c->rnd, 0xDEADBEEF); | |
| ff_bswapdsp_init(&c->bdsp); | |
| ff_mpadsp_init(&c->mpadsp); | |
| c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4); | |
| init_get_bits(&gb, buf, 128); | |
| c->IS = get_bits1(&gb); | |
| c->MSS = get_bits1(&gb); | |
| c->maxbands = get_bits(&gb, 6); | |
| if(c->maxbands >= BANDS){ | |
| av_log(avctx, AV_LOG_ERROR, "Too many bands: %i\n", c->maxbands); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| skip_bits_long(&gb, 88); | |
| c->gapless = get_bits1(&gb); | |
| c->lastframelen = get_bits(&gb, 11); | |
| av_log(avctx, AV_LOG_DEBUG, "IS: %d, MSS: %d, TG: %d, LFL: %d, bands: %d\n", | |
| c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands); | |
| c->frames_to_skip = 0; | |
| avctx->sample_fmt = AV_SAMPLE_FMT_S16P; | |
| av_channel_layout_uninit(&avctx->ch_layout); | |
| avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO; | |
| ff_thread_once(&init_static_once, mpc7_init_static); | |
| return 0; | |
| } | |
| /** | |
| * Fill samples for given subband | |
| */ | |
| static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *dst) | |
| { | |
| int i, i1, t; | |
| switch(idx){ | |
| case -1: | |
| for(i = 0; i < SAMPLES_PER_BAND; i++){ | |
| *dst++ = (av_lfg_get(&c->rnd) & 0x3FC) - 510; | |
| } | |
| break; | |
| case 1: | |
| i1 = get_bits1(gb); | |
| for(i = 0; i < SAMPLES_PER_BAND/3; i++){ | |
| t = get_vlc2(gb, quant_vlc[0][i1], 9, 2); | |
| *dst++ = mpc7_idx30[t]; | |
| *dst++ = mpc7_idx31[t]; | |
| *dst++ = mpc7_idx32[t]; | |
| } | |
| break; | |
| case 2: | |
| i1 = get_bits1(gb); | |
| for(i = 0; i < SAMPLES_PER_BAND/2; i++){ | |
| t = get_vlc2(gb, quant_vlc[1][i1], 9, 2); | |
| *dst++ = mpc7_idx50[t]; | |
| *dst++ = mpc7_idx51[t]; | |
| } | |
| break; | |
| case 3: case 4: case 5: case 6: case 7: | |
| i1 = get_bits1(gb); | |
| for(i = 0; i < SAMPLES_PER_BAND; i++) | |
| *dst++ = get_vlc2(gb, quant_vlc[idx-1][i1], 9, 2); | |
| break; | |
| case 8: case 9: case 10: case 11: case 12: | |
| case 13: case 14: case 15: case 16: case 17: | |
| t = (1 << (idx - 2)) - 1; | |
| for(i = 0; i < SAMPLES_PER_BAND; i++) | |
| *dst++ = get_bits(gb, idx - 1) - t; | |
| break; | |
| default: // case 0 and -2..-17 | |
| return; | |
| } | |
| } | |
| static int get_scale_idx(GetBitContext *gb, int ref) | |
| { | |
| int t = get_vlc2(gb, dscf_vlc, MPC7_DSCF_BITS, 1); | |
| if (t == 8) | |
| return get_bits(gb, 6); | |
| return ref + t; | |
| } | |
| static int mpc7_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| int *got_frame_ptr, AVPacket *avpkt) | |
| { | |
| const uint8_t *buf = avpkt->data; | |
| int buf_size; | |
| MPCContext *c = avctx->priv_data; | |
| GetBitContext gb; | |
| int i, ch; | |
| int mb = -1; | |
| Band *bands = c->bands; | |
| int off, ret, last_frame, skip; | |
| int bits_used, bits_avail; | |
| memset(bands, 0, sizeof(*bands) * (c->maxbands + 1)); | |
| buf_size = avpkt->size & ~3; | |
| if (buf_size <= 0) { | |
| av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n", | |
| avpkt->size); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if (buf_size != avpkt->size) { | |
| av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. " | |
| "extra bytes at the end will be skipped.\n"); | |
| } | |
| skip = buf[0]; | |
| last_frame = buf[1]; | |
| buf += 4; | |
| buf_size -= 4; | |
| /* get output buffer */ | |
| frame->nb_samples = MPC_FRAME_SIZE; | |
| if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
| return ret; | |
| av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size); | |
| if (!c->bits) | |
| return AVERROR(ENOMEM); | |
| c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf, | |
| buf_size >> 2); | |
| if ((ret = init_get_bits8(&gb, c->bits, buf_size)) < 0) | |
| return ret; | |
| skip_bits_long(&gb, skip); | |
| /* read subband indexes */ | |
| for(i = 0; i <= c->maxbands; i++){ | |
| for(ch = 0; ch < 2; ch++){ | |
| int t = i ? get_vlc2(&gb, hdr_vlc, MPC7_HDR_BITS, 1) : 4; | |
| if(t == 4) bands[i].res[ch] = get_bits(&gb, 4); | |
| else bands[i].res[ch] = bands[i-1].res[ch] + t; | |
| if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) { | |
| av_log(avctx, AV_LOG_ERROR, "subband index invalid\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| } | |
| if(bands[i].res[0] || bands[i].res[1]){ | |
| mb = i; | |
| if(c->MSS) bands[i].msf = get_bits1(&gb); | |
| } | |
| } | |
| /* get scale indexes coding method */ | |
| for(i = 0; i <= mb; i++) | |
| for(ch = 0; ch < 2; ch++) | |
| if (bands[i].res[ch]) | |
| bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc, MPC7_SCFI_BITS, 1); | |
| /* get scale indexes */ | |
| for(i = 0; i <= mb; i++){ | |
| for(ch = 0; ch < 2; ch++){ | |
| if(bands[i].res[ch]){ | |
| bands[i].scf_idx[ch][2] = c->oldDSCF[ch][i]; | |
| bands[i].scf_idx[ch][0] = get_scale_idx(&gb, bands[i].scf_idx[ch][2]); | |
| switch(bands[i].scfi[ch]){ | |
| case 0: | |
| bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]); | |
| bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]); | |
| break; | |
| case 1: | |
| bands[i].scf_idx[ch][1] = get_scale_idx(&gb, bands[i].scf_idx[ch][0]); | |
| bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1]; | |
| break; | |
| case 2: | |
| bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; | |
| bands[i].scf_idx[ch][2] = get_scale_idx(&gb, bands[i].scf_idx[ch][1]); | |
| break; | |
| case 3: | |
| bands[i].scf_idx[ch][2] = bands[i].scf_idx[ch][1] = bands[i].scf_idx[ch][0]; | |
| break; | |
| } | |
| c->oldDSCF[ch][i] = bands[i].scf_idx[ch][2]; | |
| } | |
| } | |
| } | |
| /* get quantizers */ | |
| memset(c->Q, 0, sizeof(c->Q)); | |
| off = 0; | |
| for(i = 0; i < BANDS; i++, off += SAMPLES_PER_BAND) | |
| for(ch = 0; ch < 2; ch++) | |
| idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off); | |
| ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2); | |
| if(last_frame) | |
| frame->nb_samples = c->lastframelen; | |
| bits_used = get_bits_count(&gb); | |
| bits_avail = buf_size * 8; | |
| if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) { | |
| av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if(c->frames_to_skip){ | |
| c->frames_to_skip--; | |
| *got_frame_ptr = 0; | |
| return avpkt->size; | |
| } | |
| *got_frame_ptr = 1; | |
| return avpkt->size; | |
| } | |
| static void mpc7_decode_flush(AVCodecContext *avctx) | |
| { | |
| MPCContext *c = avctx->priv_data; | |
| memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); | |
| c->frames_to_skip = 32; | |
| } | |
| static av_cold int mpc7_decode_close(AVCodecContext *avctx) | |
| { | |
| MPCContext *c = avctx->priv_data; | |
| av_freep(&c->bits); | |
| c->buf_size = 0; | |
| return 0; | |
| } | |
| const FFCodec ff_mpc7_decoder = { | |
| .p.name = "mpc7", | |
| CODEC_LONG_NAME("Musepack SV7"), | |
| .p.type = AVMEDIA_TYPE_AUDIO, | |
| .p.id = AV_CODEC_ID_MUSEPACK7, | |
| .priv_data_size = sizeof(MPCContext), | |
| .init = mpc7_decode_init, | |
| .close = mpc7_decode_close, | |
| FF_CODEC_DECODE_CB(mpc7_decode_frame), | |
| .flush = mpc7_decode_flush, | |
| .p.capabilities = AV_CODEC_CAP_DR1, | |
| .p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, | |
| AV_SAMPLE_FMT_NONE }, | |
| }; |