| /* |
| * 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 "avcodec.h" |
| #include "get_bits.h" |
| #include "internal.h" |
| #include "mpegaudiodsp.h" |
| |
| #include "mpc.h" |
| #include "mpc7data.h" |
| |
| static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2]; |
| |
| static const uint16_t quant_offsets[MPC7_QUANT_VLC_TABLES*2 + 1] = |
| { |
| 0, 512, 1024, 1536, 2052, 2564, 3076, 3588, 4100, 4612, 5124, |
| 5636, 6164, 6676, 7224 |
| }; |
| |
| |
| static av_cold int mpc7_decode_init(AVCodecContext * avctx) |
| { |
| int i, j; |
| MPCContext *c = avctx->priv_data; |
| GetBitContext gb; |
| LOCAL_ALIGNED_16(uint8_t, buf, [16]); |
| static int vlc_initialized = 0; |
| |
| static VLC_TYPE scfi_table[1 << MPC7_SCFI_BITS][2]; |
| static VLC_TYPE dscf_table[1 << MPC7_DSCF_BITS][2]; |
| static VLC_TYPE hdr_table[1 << MPC7_HDR_BITS][2]; |
| static VLC_TYPE quant_tables[7224][2]; |
| |
| /* Musepack SV7 is always stereo */ |
| if (avctx->channels != 2) { |
| avpriv_request_sample(avctx, "%d channels", avctx->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 -1; |
| } |
| 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); |
| ff_mpc_init(); |
| 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 -1; |
| } |
| 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; |
| avctx->channel_layout = AV_CH_LAYOUT_STEREO; |
| |
| if(vlc_initialized) return 0; |
| av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); |
| scfi_vlc.table = scfi_table; |
| scfi_vlc.table_allocated = 1 << MPC7_SCFI_BITS; |
| if(init_vlc(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE, |
| &mpc7_scfi[1], 2, 1, |
| &mpc7_scfi[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){ |
| av_log(avctx, AV_LOG_ERROR, "Cannot init SCFI VLC\n"); |
| return -1; |
| } |
| dscf_vlc.table = dscf_table; |
| dscf_vlc.table_allocated = 1 << MPC7_DSCF_BITS; |
| if(init_vlc(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE, |
| &mpc7_dscf[1], 2, 1, |
| &mpc7_dscf[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){ |
| av_log(avctx, AV_LOG_ERROR, "Cannot init DSCF VLC\n"); |
| return -1; |
| } |
| hdr_vlc.table = hdr_table; |
| hdr_vlc.table_allocated = 1 << MPC7_HDR_BITS; |
| if(init_vlc(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE, |
| &mpc7_hdr[1], 2, 1, |
| &mpc7_hdr[0], 2, 1, INIT_VLC_USE_NEW_STATIC)){ |
| av_log(avctx, AV_LOG_ERROR, "Cannot init HDR VLC\n"); |
| return -1; |
| } |
| for(i = 0; i < MPC7_QUANT_VLC_TABLES; i++){ |
| for(j = 0; j < 2; j++){ |
| quant_vlc[i][j].table = &quant_tables[quant_offsets[i*2 + j]]; |
| quant_vlc[i][j].table_allocated = quant_offsets[i*2 + j + 1] - quant_offsets[i*2 + j]; |
| if(init_vlc(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i], |
| &mpc7_quant_vlc[i][j][1], 4, 2, |
| &mpc7_quant_vlc[i][j][0], 4, 2, INIT_VLC_USE_NEW_STATIC)){ |
| av_log(avctx, AV_LOG_ERROR, "Cannot init QUANT VLC %i,%i\n",i,j); |
| return -1; |
| } |
| } |
| } |
| vlc_initialized = 1; |
| |
| 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].table, 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].table, 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].table, 9, 2) - mpc7_quant_vlc_off[idx-1]; |
| 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.table, MPC7_DSCF_BITS, 1) - 7; |
| if (t == 8) |
| return get_bits(gb, 6); |
| return ref + t; |
| } |
| |
| static int mpc7_decode_frame(AVCodecContext * avctx, void *data, |
| int *got_frame_ptr, AVPacket *avpkt) |
| { |
| AVFrame *frame = data; |
| 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); |
| init_get_bits(&gb, c->bits, buf_size * 8); |
| skip_bits_long(&gb, skip); |
| |
| /* read subband indexes */ |
| for(i = 0; i <= c->maxbands; i++){ |
| for(ch = 0; ch < 2; ch++){ |
| int t = 4; |
| if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5; |
| 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.table, 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 -1; |
| } |
| 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; |
| } |
| |
| AVCodec ff_mpc7_decoder = { |
| .name = "mpc7", |
| .long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"), |
| .type = AVMEDIA_TYPE_AUDIO, |
| .id = AV_CODEC_ID_MUSEPACK7, |
| .priv_data_size = sizeof(MPCContext), |
| .init = mpc7_decode_init, |
| .close = mpc7_decode_close, |
| .decode = mpc7_decode_frame, |
| .flush = mpc7_decode_flush, |
| .capabilities = AV_CODEC_CAP_DR1, |
| .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
| AV_SAMPLE_FMT_NONE }, |
| }; |
