diff options
Diffstat (limited to 'contrib/ffmpeg/libavcodec/mpegaudiodecheader.c')
-rw-r--r-- | contrib/ffmpeg/libavcodec/mpegaudiodecheader.c | 109 |
1 files changed, 0 insertions, 109 deletions
diff --git a/contrib/ffmpeg/libavcodec/mpegaudiodecheader.c b/contrib/ffmpeg/libavcodec/mpegaudiodecheader.c deleted file mode 100644 index efea49961..000000000 --- a/contrib/ffmpeg/libavcodec/mpegaudiodecheader.c +++ /dev/null @@ -1,109 +0,0 @@ -/* - * MPEG Audio header decoder - * Copyright (c) 2001, 2002 Fabrice Bellard. - * - * 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 mpegaudiodecheader.c - * MPEG Audio header decoder. - */ - -//#define DEBUG -#include "avcodec.h" -#include "mpegaudio.h" -#include "mpegaudiodata.h" - - -int ff_mpegaudio_decode_header(MPADecodeContext *s, uint32_t header) -{ - int sample_rate, frame_size, mpeg25, padding; - int sample_rate_index, bitrate_index; - if (header & (1<<20)) { - s->lsf = (header & (1<<19)) ? 0 : 1; - mpeg25 = 0; - } else { - s->lsf = 1; - mpeg25 = 1; - } - - s->layer = 4 - ((header >> 17) & 3); - /* extract frequency */ - sample_rate_index = (header >> 10) & 3; - sample_rate = ff_mpa_freq_tab[sample_rate_index] >> (s->lsf + mpeg25); - sample_rate_index += 3 * (s->lsf + mpeg25); - s->sample_rate_index = sample_rate_index; - s->error_protection = ((header >> 16) & 1) ^ 1; - s->sample_rate = sample_rate; - - bitrate_index = (header >> 12) & 0xf; - padding = (header >> 9) & 1; - //extension = (header >> 8) & 1; - s->mode = (header >> 6) & 3; - s->mode_ext = (header >> 4) & 3; - //copyright = (header >> 3) & 1; - //original = (header >> 2) & 1; - //emphasis = header & 3; - - if (s->mode == MPA_MONO) - s->nb_channels = 1; - else - s->nb_channels = 2; - - if (bitrate_index != 0) { - frame_size = ff_mpa_bitrate_tab[s->lsf][s->layer - 1][bitrate_index]; - s->bit_rate = frame_size * 1000; - switch(s->layer) { - case 1: - frame_size = (frame_size * 12000) / sample_rate; - frame_size = (frame_size + padding) * 4; - break; - case 2: - frame_size = (frame_size * 144000) / sample_rate; - frame_size += padding; - break; - default: - case 3: - frame_size = (frame_size * 144000) / (sample_rate << s->lsf); - frame_size += padding; - break; - } - s->frame_size = frame_size; - } else { - /* if no frame size computed, signal it */ - return 1; - } - -#if defined(DEBUG) - dprintf(s->avctx, "layer%d, %d Hz, %d kbits/s, ", - s->layer, s->sample_rate, s->bit_rate); - if (s->nb_channels == 2) { - if (s->layer == 3) { - if (s->mode_ext & MODE_EXT_MS_STEREO) - dprintf(s->avctx, "ms-"); - if (s->mode_ext & MODE_EXT_I_STEREO) - dprintf(s->avctx, "i-"); - } - dprintf(s->avctx, "stereo"); - } else { - dprintf(s->avctx, "mono"); - } - dprintf(s->avctx, "\n"); -#endif - return 0; -} |