diff options
Diffstat (limited to 'libavcodec/mpc8.c')
-rw-r--r-- | libavcodec/mpc8.c | 128 |
1 files changed, 71 insertions, 57 deletions
diff --git a/libavcodec/mpc8.c b/libavcodec/mpc8.c index 649eb02..3be2f79 100644 --- a/libavcodec/mpc8.c +++ b/libavcodec/mpc8.c @@ -2,20 +2,20 @@ * Musepack SV8 decoder * Copyright (c) 2007 Konstantin Shishkov * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -27,12 +27,10 @@ #include "libavutil/channel_layout.h" #include "libavutil/lfg.h" - #include "avcodec.h" -#include "bitstream.h" +#include "get_bits.h" #include "internal.h" #include "mpegaudiodsp.h" -#include "vlc.h" #include "mpc.h" #include "mpc8data.h" @@ -44,22 +42,22 @@ static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc; static const int q3_offsets[2] = { MPC8_Q3_OFFSET, MPC8_Q4_OFFSET }; static const int quant_offsets[6] = { MPC8_Q5_OFFSET, MPC8_Q6_OFFSET, MPC8_Q7_OFFSET, MPC8_Q8_OFFSET }; -static inline int mpc8_dec_base(BitstreamContext *bc, int k, int n) +static inline int mpc8_dec_base(GetBitContext *gb, int k, int n) { int len = mpc8_cnk_len[k-1][n-1] - 1; - int code = len ? bitstream_read(bc, len) : 0; + int code = len ? get_bits_long(gb, len) : 0; if (code >= mpc8_cnk_lost[k-1][n-1]) - code = ((code << 1) | bitstream_read_bit(bc)) - mpc8_cnk_lost[k - 1][n - 1]; + code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1]; return code; } -static inline int mpc8_dec_enum(BitstreamContext *bc, int k, int n) +static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n) { int bits = 0; const uint32_t * C = mpc8_cnk[k-1]; - int code = mpc8_dec_base(bc, k, n); + int code = mpc8_dec_base(gb, k, n); do { n--; @@ -74,18 +72,18 @@ static inline int mpc8_dec_enum(BitstreamContext *bc, int k, int n) return bits; } -static inline int mpc8_get_mod_golomb(BitstreamContext *bc, int m) +static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m) { if(mpc8_cnk_len[0][m] < 1) return 0; - return mpc8_dec_base(bc, 1, m + 1); + return mpc8_dec_base(gb, 1, m+1); } -static int mpc8_get_mask(BitstreamContext *bc, int size, int t) +static int mpc8_get_mask(GetBitContext *gb, int size, int t) { int mask = 0; if(t && t != size) - mask = mpc8_dec_enum(bc, FFMIN(t, size - t), size); + mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size); if((t << 1) > size) mask = ~mask; return mask; @@ -99,7 +97,7 @@ static av_cold int mpc8_decode_init(AVCodecContext * avctx) { int i; MPCContext *c = avctx->priv_data; - BitstreamContext bc; + GetBitContext gb; static int vlc_initialized = 0; int channels; @@ -124,20 +122,25 @@ static av_cold int mpc8_decode_init(AVCodecContext * avctx) ff_mpc_init(); - bitstream_init(&bc, avctx->extradata, 16); + init_get_bits(&gb, avctx->extradata, 16); - bitstream_skip(&bc, 3); // sample rate - c->maxbands = bitstream_read(&bc, 5) + 1; - channels = bitstream_read(&bc, 4) + 1; + skip_bits(&gb, 3);//sample rate + c->maxbands = get_bits(&gb, 5) + 1; + if (c->maxbands >= BANDS) { + av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands); + return AVERROR_INVALIDDATA; + } + channels = get_bits(&gb, 4) + 1; if (channels > 2) { avpriv_request_sample(avctx, "Multichannel MPC SV8"); return AVERROR_PATCHWELCOME; } - c->MSS = bitstream_read_bit(&bc); - c->frames = 1 << (bitstream_read(&bc, 3) * 2); + c->MSS = get_bits1(&gb); + c->frames = 1 << (get_bits(&gb, 3) * 2); avctx->sample_fmt = AV_SAMPLE_FMT_S16P; - avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; + avctx->channel_layout = (channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; + avctx->channels = channels; if(vlc_initialized) return 0; av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); @@ -240,37 +243,40 @@ static int mpc8_decode_frame(AVCodecContext * avctx, void *data, const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; MPCContext *c = avctx->priv_data; - BitstreamContext bc2, *bc = &bc2; + GetBitContext gb2, *gb = &gb2; int i, j, k, ch, cnt, res, t; Band *bands = c->bands; int off; int maxband, keyframe; int last[2]; - /* get output buffer */ - frame->nb_samples = MPC_FRAME_SIZE; - if ((res = ff_get_buffer(avctx, frame, 0)) < 0) { - av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); - return res; - } - keyframe = c->cur_frame == 0; if(keyframe){ memset(c->Q, 0, sizeof(c->Q)); c->last_bits_used = 0; } - bitstream_init8(bc, buf, buf_size); - bitstream_skip(bc, c->last_bits_used & 7); + if ((res = init_get_bits8(gb, buf, buf_size)) < 0) + return res; + + skip_bits(gb, c->last_bits_used & 7); if(keyframe) - maxband = mpc8_get_mod_golomb(bc, c->maxbands + 1); + maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1); else{ - maxband = c->last_max_band + bitstream_read_vlc(bc, band_vlc.table, MPC8_BANDS_BITS, 2); + maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2); if(maxband > 32) maxband -= 33; } - if(maxband > c->maxbands + 1) + + if (get_bits_left(gb) < 0) { + *got_frame_ptr = 0; + return buf_size; + } + + if(maxband > c->maxbands + 1) { + av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband); return AVERROR_INVALIDDATA; + } c->last_max_band = maxband; /* read subband indexes */ @@ -278,7 +284,7 @@ static int mpc8_decode_frame(AVCodecContext * avctx, void *data, last[0] = last[1] = 0; for(i = maxband - 1; i >= 0; i--){ for(ch = 0; ch < 2; ch++){ - last[ch] = bitstream_read_vlc(bc, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch]; + last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch]; if(last[ch] > 15) last[ch] -= 17; bands[i].res[ch] = last[ch]; } @@ -290,8 +296,8 @@ static int mpc8_decode_frame(AVCodecContext * avctx, void *data, for(i = 0; i < maxband; i++) if(bands[i].res[0] || bands[i].res[1]) cnt++; - t = mpc8_get_mod_golomb(bc, cnt); - mask = mpc8_get_mask(bc, cnt, t); + t = mpc8_get_mod_golomb(gb, cnt); + mask = mpc8_get_mask(gb, cnt, t); for(i = maxband - 1; i >= 0; i--) if(bands[i].res[0] || bands[i].res[1]){ bands[i].msf = mask & 1; @@ -311,7 +317,7 @@ static int mpc8_decode_frame(AVCodecContext * avctx, void *data, if(bands[i].res[0] || bands[i].res[1]){ cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1; if(cnt >= 0){ - t = bitstream_read_vlc(bc, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1); + t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1); if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt); if(bands[i].res[1]) bands[i].scfi[1] = t & 3; } @@ -323,21 +329,21 @@ static int mpc8_decode_frame(AVCodecContext * avctx, void *data, if(!bands[i].res[ch]) continue; if(c->oldDSCF[ch][i]){ - bands[i].scf_idx[ch][0] = bitstream_read(bc, 7) - 6; + bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6; c->oldDSCF[ch][i] = 0; }else{ - t = bitstream_read_vlc(bc, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2); + t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2); if(t == 64) - t += bitstream_read(bc, 6); + t += get_bits(gb, 6); bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6; } for(j = 0; j < 2; j++){ if((bands[i].scfi[ch] << j) & 2) bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j]; else{ - t = bitstream_read_vlc(bc, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2); + t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2); if(t == 31) - t = 64 + bitstream_read(bc, 6); + t = 64 + get_bits(gb, 6); bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6; } } @@ -356,16 +362,16 @@ static int mpc8_decode_frame(AVCodecContext * avctx, void *data, break; case 1: for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){ - cnt = bitstream_read_vlc(bc, q1_vlc.table, MPC8_Q1_BITS, 2); - t = mpc8_get_mask(bc, 18, cnt); + cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2); + t = mpc8_get_mask(gb, 18, cnt); for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1) - c->Q[ch][off + j + k] = (t & 0x20000) ? (bitstream_read_bit(bc) << 1) - 1 : 0; + c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0; } break; case 2: cnt = 6;//2*mpc8_thres[res] for(j = 0; j < SAMPLES_PER_BAND; j += 3){ - t = bitstream_read_vlc(bc, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2); + t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2); c->Q[ch][off + j + 0] = mpc8_idx50[t]; c->Q[ch][off + j + 1] = mpc8_idx51[t]; c->Q[ch][off + j + 2] = mpc8_idx52[t]; @@ -375,7 +381,7 @@ static int mpc8_decode_frame(AVCodecContext * avctx, void *data, case 3: case 4: for(j = 0; j < SAMPLES_PER_BAND; j += 2){ - t = bitstream_read_vlc(bc, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3]; + t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3]; c->Q[ch][off + j + 1] = t >> 4; c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF); } @@ -386,17 +392,17 @@ static int mpc8_decode_frame(AVCodecContext * avctx, void *data, case 8: cnt = 2 * mpc8_thres[res]; for(j = 0; j < SAMPLES_PER_BAND; j++){ - t = bitstream_read_vlc(bc, quant_vlc[res - 5][cnt > mpc8_thres[res]].table, quant_vlc[res - 5][cnt > mpc8_thres[res]].bits, 2) + quant_offsets[res - 5]; + t = get_vlc2(gb, quant_vlc[res - 5][cnt > mpc8_thres[res]].table, quant_vlc[res - 5][cnt > mpc8_thres[res]].bits, 2) + quant_offsets[res - 5]; c->Q[ch][off + j] = t; cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]); } break; default: for(j = 0; j < SAMPLES_PER_BAND; j++){ - c->Q[ch][off + j] = bitstream_read_vlc(bc, q9up_vlc.table, MPC8_Q9UP_BITS, 2); + c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2); if(res != 9){ c->Q[ch][off + j] <<= res - 9; - c->Q[ch][off + j] |= bitstream_read(bc, res - 9); + c->Q[ch][off + j] |= get_bits(gb, res - 9); } c->Q[ch][off + j] -= (1 << (res - 2)) - 1; } @@ -404,17 +410,25 @@ static int mpc8_decode_frame(AVCodecContext * avctx, void *data, } } + frame->nb_samples = MPC_FRAME_SIZE; + if ((res = ff_get_buffer(avctx, frame, 0)) < 0) + return res; + ff_mpc_dequantize_and_synth(c, maxband - 1, (int16_t **)frame->extended_data, avctx->channels); c->cur_frame++; - c->last_bits_used = bitstream_tell(bc); - if (bitstream_bits_left(bc) < 8) // we have only padding left - c->last_bits_used = buf_size << 3; + c->last_bits_used = get_bits_count(gb); if(c->cur_frame >= c->frames) c->cur_frame = 0; + if (get_bits_left(gb) < 0) { + av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb)); + c->last_bits_used = buf_size << 3; + } else if (c->cur_frame == 0 && get_bits_left(gb) < 8) {// we have only padding left + c->last_bits_used = buf_size << 3; + } *got_frame_ptr = 1; |