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Diffstat (limited to 'contrib/ffmpeg/libavcodec/mpegaudiodecheader.c')
-rw-r--r--contrib/ffmpeg/libavcodec/mpegaudiodecheader.c109
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;
-}