diff options
Diffstat (limited to 'libavcodec/mpc7.c')
| -rw-r--r-- | libavcodec/mpc7.c | 30 |
1 files changed, 16 insertions, 14 deletions
diff --git a/libavcodec/mpc7.c b/libavcodec/mpc7.c index b013eeb..9f3cf6c 100644 --- a/libavcodec/mpc7.c +++ b/libavcodec/mpc7.c @@ -2,20 +2,20 @@ * Musepack SV7 decoder * Copyright (c) 2006 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 */ @@ -35,10 +35,6 @@ #include "mpc.h" #include "mpc7data.h" -#define BANDS 32 -#define SAMPLES_PER_BAND 36 -#define MPC_FRAME_SIZE (BANDS * SAMPLES_PER_BAND) - 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] = @@ -97,6 +93,9 @@ static av_cold int mpc7_decode_init(AVCodecContext * avctx) avctx->sample_fmt = AV_SAMPLE_FMT_S16P; avctx->channel_layout = AV_CH_LAYOUT_STEREO; + avcodec_get_frame_defaults(&c->frame); + avctx->coded_frame = &c->frame; + if(vlc_initialized) return 0; av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); scfi_vlc.table = scfi_table; @@ -137,9 +136,6 @@ static av_cold int mpc7_decode_init(AVCodecContext * avctx) } vlc_initialized = 1; - avcodec_get_frame_defaults(&c->frame); - avctx->coded_frame = &c->frame; - return 0; } @@ -193,7 +189,7 @@ 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 av_clip_uintp2(ref + t, 7); + return ref + t; } static int mpc7_decode_frame(AVCodecContext * avctx, void *data, @@ -228,7 +224,7 @@ static int mpc7_decode_frame(AVCodecContext * avctx, void *data, buf_size -= 4; /* get output buffer */ - c->frame.nb_samples = last_frame ? c->lastframelen : MPC_FRAME_SIZE; + c->frame.nb_samples = MPC_FRAME_SIZE; if ((ret = avctx->get_buffer(avctx, &c->frame)) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return ret; @@ -247,7 +243,11 @@ static int mpc7_decode_frame(AVCodecContext * avctx, void *data, 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] = av_clip(bands[i-1].res[ch] + t, 0, 17); + 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]){ @@ -294,6 +294,8 @@ static int mpc7_decode_frame(AVCodecContext * avctx, void *data, idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off); ff_mpc_dequantize_and_synth(c, mb, (int16_t **)c->frame.extended_data, 2); + if(last_frame) + c->frame.nb_samples = c->lastframelen; bits_used = get_bits_count(&gb); bits_avail = buf_size * 8; |
