From d6902070c52151ec1e8154ce9b22283a1d0bc192 Mon Sep 17 00:00:00 2001 From: Nidhi Makhijani Date: Sun, 6 Jul 2014 19:15:52 +0530 Subject: dsicin: Split audio and video decoder Signed-off-by: Diego Biurrun --- libavcodec/dsicinaudio.c | 135 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 135 insertions(+) create mode 100644 libavcodec/dsicinaudio.c (limited to 'libavcodec/dsicinaudio.c') diff --git a/libavcodec/dsicinaudio.c b/libavcodec/dsicinaudio.c new file mode 100644 index 0000000000..969e4ae195 --- /dev/null +++ b/libavcodec/dsicinaudio.c @@ -0,0 +1,135 @@ +/* + * Delphine Software International CIN audio decoder + * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net) + * + * This file is part of Libav. + * + * Libav 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, + * 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 + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Delphine Software International CIN audio decoder + */ + +#include "libavutil/channel_layout.h" + +#include "avcodec.h" +#include "bytestream.h" +#include "internal.h" +#include "mathops.h" + +typedef struct CinAudioContext { + int initial_decode_frame; + int delta; +} CinAudioContext; + + +/* table defining a geometric sequence with multiplier = 32767 ^ (1 / 128) */ +static const int16_t cinaudio_delta16_table[256] = { + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, -30210, -27853, -25680, -23677, -21829, + -20126, -18556, -17108, -15774, -14543, -13408, -12362, -11398, + -10508, -9689, -8933, -8236, -7593, -7001, -6455, -5951, + -5487, -5059, -4664, -4300, -3964, -3655, -3370, -3107, + -2865, -2641, -2435, -2245, -2070, -1908, -1759, -1622, + -1495, -1379, -1271, -1172, -1080, -996, -918, -847, + -781, -720, -663, -612, -564, -520, -479, -442, + -407, -376, -346, -319, -294, -271, -250, -230, + -212, -196, -181, -166, -153, -141, -130, -120, + -111, -102, -94, -87, -80, -74, -68, -62, + -58, -53, -49, -45, -41, -38, -35, -32, + -30, -27, -25, -23, -21, -20, -18, -17, + -15, -14, -13, -12, -11, -10, -9, -8, + -7, -6, -5, -4, -3, -2, -1, 0, + 0, 1, 2, 3, 4, 5, 6, 7, + 8, 9, 10, 11, 12, 13, 14, 15, + 17, 18, 20, 21, 23, 25, 27, 30, + 32, 35, 38, 41, 45, 49, 53, 58, + 62, 68, 74, 80, 87, 94, 102, 111, + 120, 130, 141, 153, 166, 181, 196, 212, + 230, 250, 271, 294, 319, 346, 376, 407, + 442, 479, 520, 564, 612, 663, 720, 781, + 847, 918, 996, 1080, 1172, 1271, 1379, 1495, + 1622, 1759, 1908, 2070, 2245, 2435, 2641, 2865, + 3107, 3370, 3655, 3964, 4300, 4664, 5059, 5487, + 5951, 6455, 7001, 7593, 8236, 8933, 9689, 10508, + 11398, 12362, 13408, 14543, 15774, 17108, 18556, 20126, + 21829, 23677, 25680, 27853, 30210, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0 +}; + +static av_cold int cinaudio_decode_init(AVCodecContext *avctx) +{ + CinAudioContext *cin = avctx->priv_data; + + cin->initial_decode_frame = 1; + cin->delta = 0; + avctx->sample_fmt = AV_SAMPLE_FMT_S16; + avctx->channels = 1; + avctx->channel_layout = AV_CH_LAYOUT_MONO; + + return 0; +} + +static int cinaudio_decode_frame(AVCodecContext *avctx, void *data, + int *got_frame_ptr, AVPacket *avpkt) +{ + AVFrame *frame = data; + const uint8_t *buf = avpkt->data; + CinAudioContext *cin = avctx->priv_data; + const uint8_t *buf_end = buf + avpkt->size; + int16_t *samples; + int delta, ret; + + /* get output buffer */ + frame->nb_samples = avpkt->size - cin->initial_decode_frame; + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) { + av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return ret; + } + samples = (int16_t *)frame->data[0]; + + delta = cin->delta; + if (cin->initial_decode_frame) { + cin->initial_decode_frame = 0; + delta = sign_extend(AV_RL16(buf), 16); + buf += 2; + *samples++ = delta; + } + while (buf < buf_end) { + delta += cinaudio_delta16_table[*buf++]; + delta = av_clip_int16(delta); + *samples++ = delta; + } + cin->delta = delta; + + *got_frame_ptr = 1; + + return avpkt->size; +} + +AVCodec ff_dsicinaudio_decoder = { + .name = "dsicinaudio", + .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN audio"), + .type = AVMEDIA_TYPE_AUDIO, + .id = AV_CODEC_ID_DSICINAUDIO, + .priv_data_size = sizeof(CinAudioContext), + .init = cinaudio_decode_init, + .decode = cinaudio_decode_frame, + .capabilities = CODEC_CAP_DR1, +}; -- cgit v1.2.3