X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=synfig-core%2Ftags%2Fsynfig_0_61_03%2Fsynfig-core%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fpcm.c;fp=synfig-core%2Ftags%2Fsynfig_0_61_03%2Fsynfig-core%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fpcm.c;h=0000000000000000000000000000000000000000;hb=6fa8f2f38d4b0b35f8539bf94e27ae27015c7689;hp=7f3d630f0860ed264aa727c7e881dc15041853de;hpb=47fce282611fbba1044921d22ca887f9b53ad91a;p=synfig.git diff --git a/synfig-core/tags/synfig_0_61_03/synfig-core/src/modules/mod_libavcodec/libavcodec/pcm.c b/synfig-core/tags/synfig_0_61_03/synfig-core/src/modules/mod_libavcodec/libavcodec/pcm.c deleted file mode 100644 index 7f3d630..0000000 --- a/synfig-core/tags/synfig_0_61_03/synfig-core/src/modules/mod_libavcodec/libavcodec/pcm.c +++ /dev/null @@ -1,383 +0,0 @@ -/* - * PCM codecs - * Copyright (c) 2001 Fabrice Bellard. - * - * This library 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 of the License, or (at your option) any later version. - * - * This library 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 this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -/** - * @file pcm.c - * PCM codecs - */ - -#include "avcodec.h" - -/* from g711.c by SUN microsystems (unrestricted use) */ - -#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */ -#define QUANT_MASK (0xf) /* Quantization field mask. */ -#define NSEGS (8) /* Number of A-law segments. */ -#define SEG_SHIFT (4) /* Left shift for segment number. */ -#define SEG_MASK (0x70) /* Segment field mask. */ - -#define BIAS (0x84) /* Bias for linear code. */ - -/* - * alaw2linear() - Convert an A-law value to 16-bit linear PCM - * - */ -static int alaw2linear(unsigned char a_val) -{ - int t; - int seg; - - a_val ^= 0x55; - - t = (a_val & QUANT_MASK) << 4; - seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT; - switch (seg) { - case 0: - t += 8; - break; - case 1: - t += 0x108; - break; - default: - t += 0x108; - t <<= seg - 1; - } - return ((a_val & SIGN_BIT) ? t : -t); -} - -static int ulaw2linear(unsigned char u_val) -{ - int t; - - /* Complement to obtain normal u-law value. */ - u_val = ~u_val; - - /* - * Extract and bias the quantization bits. Then - * shift up by the segment number and subtract out the bias. - */ - t = ((u_val & QUANT_MASK) << 3) + BIAS; - t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT; - - return ((u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS)); -} - -/* 16384 entries per table */ -static uint8_t *linear_to_alaw = NULL; -static int linear_to_alaw_ref = 0; - -static uint8_t *linear_to_ulaw = NULL; -static int linear_to_ulaw_ref = 0; - -static void build_xlaw_table(uint8_t *linear_to_xlaw, - int (*xlaw2linear)(unsigned char), - int mask) -{ - int i, j, v, v1, v2; - - j = 0; - for(i=0;i<128;i++) { - if (i != 127) { - v1 = xlaw2linear(i ^ mask); - v2 = xlaw2linear((i + 1) ^ mask); - v = (v1 + v2 + 4) >> 3; - } else { - v = 8192; - } - for(;j 0) - linear_to_xlaw[8192 - j] = (i ^ (mask ^ 0x80)); - } - } - linear_to_xlaw[0] = linear_to_xlaw[1]; -} - -static int pcm_encode_init(AVCodecContext *avctx) -{ - avctx->frame_size = 1; - switch(avctx->codec->id) { - case CODEC_ID_PCM_ALAW: - if (linear_to_alaw_ref == 0) { - linear_to_alaw = av_malloc(16384); - if (!linear_to_alaw) - return -1; - build_xlaw_table(linear_to_alaw, alaw2linear, 0xd5); - } - linear_to_alaw_ref++; - break; - case CODEC_ID_PCM_MULAW: - if (linear_to_ulaw_ref == 0) { - linear_to_ulaw = av_malloc(16384); - if (!linear_to_ulaw) - return -1; - build_xlaw_table(linear_to_ulaw, ulaw2linear, 0xff); - } - linear_to_ulaw_ref++; - break; - default: - break; - } - - avctx->coded_frame= avcodec_alloc_frame(); - avctx->coded_frame->key_frame= 1; - - return 0; -} - -static int pcm_encode_close(AVCodecContext *avctx) -{ - av_freep(&avctx->coded_frame); - - switch(avctx->codec->id) { - case CODEC_ID_PCM_ALAW: - if (--linear_to_alaw_ref == 0) - av_free(linear_to_alaw); - break; - case CODEC_ID_PCM_MULAW: - if (--linear_to_ulaw_ref == 0) - av_free(linear_to_ulaw); - break; - default: - /* nothing to free */ - break; - } - return 0; -} - -static int pcm_encode_frame(AVCodecContext *avctx, - unsigned char *frame, int buf_size, void *data) -{ - int n, sample_size, v; - short *samples; - unsigned char *dst; - - switch(avctx->codec->id) { - case CODEC_ID_PCM_S16LE: - case CODEC_ID_PCM_S16BE: - case CODEC_ID_PCM_U16LE: - case CODEC_ID_PCM_U16BE: - sample_size = 2; - break; - default: - sample_size = 1; - break; - } - n = buf_size / sample_size; - samples = data; - dst = frame; - - switch(avctx->codec->id) { - case CODEC_ID_PCM_S16LE: - for(;n>0;n--) { - v = *samples++; - dst[0] = v & 0xff; - dst[1] = v >> 8; - dst += 2; - } - break; - case CODEC_ID_PCM_S16BE: - for(;n>0;n--) { - v = *samples++; - dst[0] = v >> 8; - dst[1] = v; - dst += 2; - } - break; - case CODEC_ID_PCM_U16LE: - for(;n>0;n--) { - v = *samples++; - v += 0x8000; - dst[0] = v & 0xff; - dst[1] = v >> 8; - dst += 2; - } - break; - case CODEC_ID_PCM_U16BE: - for(;n>0;n--) { - v = *samples++; - v += 0x8000; - dst[0] = v >> 8; - dst[1] = v; - dst += 2; - } - break; - case CODEC_ID_PCM_S8: - for(;n>0;n--) { - v = *samples++; - dst[0] = v >> 8; - dst++; - } - break; - case CODEC_ID_PCM_U8: - for(;n>0;n--) { - v = *samples++; - dst[0] = (v >> 8) + 128; - dst++; - } - break; - case CODEC_ID_PCM_ALAW: - for(;n>0;n--) { - v = *samples++; - dst[0] = linear_to_alaw[(v + 32768) >> 2]; - dst++; - } - break; - case CODEC_ID_PCM_MULAW: - for(;n>0;n--) { - v = *samples++; - dst[0] = linear_to_ulaw[(v + 32768) >> 2]; - dst++; - } - break; - default: - return -1; - } - //avctx->frame_size = (dst - frame) / (sample_size * avctx->channels); - - return dst - frame; -} - -typedef struct PCMDecode { - short table[256]; -} PCMDecode; - -static int pcm_decode_init(AVCodecContext * avctx) -{ - PCMDecode *s = avctx->priv_data; - int i; - - switch(avctx->codec->id) { - case CODEC_ID_PCM_ALAW: - for(i=0;i<256;i++) - s->table[i] = alaw2linear(i); - break; - case CODEC_ID_PCM_MULAW: - for(i=0;i<256;i++) - s->table[i] = ulaw2linear(i); - break; - default: - break; - } - return 0; -} - -static int pcm_decode_frame(AVCodecContext *avctx, - void *data, int *data_size, - uint8_t *buf, int buf_size) -{ - PCMDecode *s = avctx->priv_data; - int n; - short *samples; - uint8_t *src; - - samples = data; - src = buf; - - switch(avctx->codec->id) { - case CODEC_ID_PCM_S16LE: - n = buf_size >> 1; - for(;n>0;n--) { - *samples++ = src[0] | (src[1] << 8); - src += 2; - } - break; - case CODEC_ID_PCM_S16BE: - n = buf_size >> 1; - for(;n>0;n--) { - *samples++ = (src[0] << 8) | src[1]; - src += 2; - } - break; - case CODEC_ID_PCM_U16LE: - n = buf_size >> 1; - for(;n>0;n--) { - *samples++ = (src[0] | (src[1] << 8)) - 0x8000; - src += 2; - } - break; - case CODEC_ID_PCM_U16BE: - n = buf_size >> 1; - for(;n>0;n--) { - *samples++ = ((src[0] << 8) | src[1]) - 0x8000; - src += 2; - } - break; - case CODEC_ID_PCM_S8: - n = buf_size; - for(;n>0;n--) { - *samples++ = src[0] << 8; - src++; - } - break; - case CODEC_ID_PCM_U8: - n = buf_size; - for(;n>0;n--) { - *samples++ = ((int)src[0] - 128) << 8; - src++; - } - break; - case CODEC_ID_PCM_ALAW: - case CODEC_ID_PCM_MULAW: - n = buf_size; - for(;n>0;n--) { - *samples++ = s->table[src[0]]; - src++; - } - break; - default: - *data_size = 0; - return -1; - } - *data_size = (uint8_t *)samples - (uint8_t *)data; - return src - buf; -} - -#define PCM_CODEC(id, name) \ -AVCodec name ## _encoder = { \ - #name, \ - CODEC_TYPE_AUDIO, \ - id, \ - 0, \ - pcm_encode_init, \ - pcm_encode_frame, \ - pcm_encode_close, \ - NULL, \ -}; \ -AVCodec name ## _decoder = { \ - #name, \ - CODEC_TYPE_AUDIO, \ - id, \ - sizeof(PCMDecode), \ - pcm_decode_init, \ - NULL, \ - NULL, \ - pcm_decode_frame, \ -} - -PCM_CODEC(CODEC_ID_PCM_S16LE, pcm_s16le); -PCM_CODEC(CODEC_ID_PCM_S16BE, pcm_s16be); -PCM_CODEC(CODEC_ID_PCM_U16LE, pcm_u16le); -PCM_CODEC(CODEC_ID_PCM_U16BE, pcm_u16be); -PCM_CODEC(CODEC_ID_PCM_S8, pcm_s8); -PCM_CODEC(CODEC_ID_PCM_U8, pcm_u8); -PCM_CODEC(CODEC_ID_PCM_ALAW, pcm_alaw); -PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw); - -#undef PCM_CODEC