X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;ds=sidebyside;f=synfig-core%2Ftrunk%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fa52dec.c;fp=synfig-core%2Ftrunk%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fa52dec.c;h=0000000000000000000000000000000000000000;hb=a9a9970c7303c616abb61b56754746cd86167fd3;hp=fb169c7ee38d4177ec8d168a9f38c23f9480d0da;hpb=55463af233b3ca621964c09954d7a9ddac564524;p=synfig.git diff --git a/synfig-core/trunk/src/modules/mod_libavcodec/libavcodec/a52dec.c b/synfig-core/trunk/src/modules/mod_libavcodec/libavcodec/a52dec.c deleted file mode 100644 index fb169c7..0000000 --- a/synfig-core/trunk/src/modules/mod_libavcodec/libavcodec/a52dec.c +++ /dev/null @@ -1,256 +0,0 @@ -/* - * A52 decoder - * 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 a52dec.c - * A52 decoder. - */ - -#include "avcodec.h" -#include "liba52/a52.h" - -#ifdef CONFIG_A52BIN -#include -static const char* liba52name = "liba52.so.0"; -#endif - -/** - * liba52 - Copyright (C) Aaron Holtzman - * released under the GPL license. - */ -typedef struct AC3DecodeState { - uint8_t inbuf[4096]; /* input buffer */ - uint8_t *inbuf_ptr; - int frame_size; - int flags; - int channels; - a52_state_t* state; - sample_t* samples; - - /* - * virtual method table - * - * using this function table so the liba52 doesn't - * have to be really linked together with ffmpeg - * and might be linked in runtime - this allows binary - * distribution of ffmpeg library which doens't depend - * on liba52 library - but if user has it installed - * it will be used - user might install such library - * separately - */ - void* handle; - a52_state_t* (*a52_init)(uint32_t mm_accel); - sample_t* (*a52_samples)(a52_state_t * state); - int (*a52_syncinfo)(uint8_t * buf, int * flags, - int * sample_rate, int * bit_rate); - int (*a52_frame)(a52_state_t * state, uint8_t * buf, int * flags, - sample_t * level, sample_t bias); - void (*a52_dynrng)(a52_state_t * state, - sample_t (* call) (sample_t, void *), void * data); - int (*a52_block)(a52_state_t * state); - void (*a52_free)(a52_state_t * state); - -} AC3DecodeState; - -#ifdef CONFIG_A52BIN -static void* dlsymm(void* handle, const char* symbol) -{ - void* f = dlsym(handle, symbol); - if (!f) - fprintf(stderr, "A52 Decoder - function '%s' can't be resolved\n", symbol); - return f; -} -#endif - -static int a52_decode_init(AVCodecContext *avctx) -{ - AC3DecodeState *s = avctx->priv_data; - -#ifdef CONFIG_A52BIN - s->handle = dlopen(liba52name, RTLD_LAZY); - if (!s->handle) - { - fprintf(stderr, "A52 library %s could not be opened! \n%s\n", liba52name, dlerror()); - return -1; - } - s->a52_init = (a52_state_t* (*)(uint32_t)) dlsymm(s->handle, "a52_init"); - s->a52_samples = (sample_t* (*)(a52_state_t*)) dlsymm(s->handle, "a52_samples"); - s->a52_syncinfo = (int (*)(uint8_t*, int*, int*, int*)) dlsymm(s->handle, "a52_syncinfo"); - s->a52_frame = (int (*)(a52_state_t*, uint8_t*, int*, sample_t*, sample_t)) dlsymm(s->handle, "a52_frame"); - s->a52_block = (int (*)(a52_state_t*)) dlsymm(s->handle, "a52_block"); - s->a52_free = (void (*)(a52_state_t*)) dlsymm(s->handle, "a52_free"); - if (!s->a52_init || !s->a52_samples || !s->a52_syncinfo - || !s->a52_frame || !s->a52_block || !s->a52_free) - { - dlclose(s->handle); - return -1; - } -#else - /* static linked version */ - s->handle = 0; - s->a52_init = a52_init; - s->a52_samples = a52_samples; - s->a52_syncinfo = a52_syncinfo; - s->a52_frame = a52_frame; - s->a52_block = a52_block; - s->a52_free = a52_free; -#endif - s->state = s->a52_init(0); /* later use CPU flags */ - s->samples = s->a52_samples(s->state); - s->inbuf_ptr = s->inbuf; - s->frame_size = 0; - - return 0; -} - -/**** the following two functions comes from a52dec */ -static inline int blah (int32_t i) -{ - if (i > 0x43c07fff) - return 32767; - else if (i < 0x43bf8000) - return -32768; - return i - 0x43c00000; -} - -static inline void float_to_int (float * _f, int16_t * s16, int nchannels) -{ - int i, j, c; - int32_t * f = (int32_t *) _f; // XXX assumes IEEE float format - - j = 0; - nchannels *= 256; - for (i = 0; i < 256; i++) { - for (c = 0; c < nchannels; c += 256) - s16[j++] = blah (f[i + c]); - } -} - -/**** end */ - -#define HEADER_SIZE 7 - -static int a52_decode_frame(AVCodecContext *avctx, - void *data, int *data_size, - uint8_t *buf, int buf_size) -{ - AC3DecodeState *s = avctx->priv_data; - uint8_t *buf_ptr; - int flags, i, len; - int sample_rate, bit_rate; - short *out_samples = data; - float level; - static const int ac3_channels[8] = { - 2, 1, 2, 3, 3, 4, 4, 5 - }; - - *data_size = 0; - buf_ptr = buf; - while (buf_size > 0) { - len = s->inbuf_ptr - s->inbuf; - if (s->frame_size == 0) { - /* no header seen : find one. We need at least 7 bytes to parse it */ - len = HEADER_SIZE - len; - if (len > buf_size) - len = buf_size; - memcpy(s->inbuf_ptr, buf_ptr, len); - buf_ptr += len; - s->inbuf_ptr += len; - buf_size -= len; - if ((s->inbuf_ptr - s->inbuf) == HEADER_SIZE) { - len = s->a52_syncinfo(s->inbuf, &s->flags, &sample_rate, &bit_rate); - if (len == 0) { - /* no sync found : move by one byte (inefficient, but simple!) */ - memcpy(s->inbuf, s->inbuf + 1, HEADER_SIZE - 1); - s->inbuf_ptr--; - } else { - s->frame_size = len; - /* update codec info */ - avctx->sample_rate = sample_rate; - s->channels = ac3_channels[s->flags & 7]; - if (s->flags & A52_LFE) - s->channels++; - if (avctx->channels == 0) - /* No specific number of channel requested */ - avctx->channels = s->channels; - else if (s->channels < avctx->channels) { - fprintf(stderr, "ac3dec: AC3 Source channels are less than specified: output to %d channels.. (frmsize: %d)\n", s->channels, len); - avctx->channels = s->channels; - } - avctx->bit_rate = bit_rate; - } - } - } else if (len < s->frame_size) { - len = s->frame_size - len; - if (len > buf_size) - len = buf_size; - - memcpy(s->inbuf_ptr, buf_ptr, len); - buf_ptr += len; - s->inbuf_ptr += len; - buf_size -= len; - } else { - flags = s->flags; - if (avctx->channels == 1) - flags = A52_MONO; - else if (avctx->channels == 2) - flags = A52_STEREO; - else - flags |= A52_ADJUST_LEVEL; - level = 1; - if (s->a52_frame(s->state, s->inbuf, &flags, &level, 384)) { - fail: - s->inbuf_ptr = s->inbuf; - s->frame_size = 0; - continue; - } - for (i = 0; i < 6; i++) { - if (s->a52_block(s->state)) - goto fail; - float_to_int(s->samples, out_samples + i * 256 * avctx->channels, avctx->channels); - } - s->inbuf_ptr = s->inbuf; - s->frame_size = 0; - *data_size = 6 * avctx->channels * 256 * sizeof(int16_t); - break; - } - } - return buf_ptr - buf; -} - -static int a52_decode_end(AVCodecContext *avctx) -{ - AC3DecodeState *s = avctx->priv_data; - s->a52_free(s->state); -#ifdef CONFIG_A52BIN - dlclose(s->handle); -#endif - return 0; -} - -AVCodec ac3_decoder = { - "ac3", - CODEC_TYPE_AUDIO, - CODEC_ID_AC3, - sizeof(AC3DecodeState), - a52_decode_init, - NULL, - a52_decode_end, - a52_decode_frame, -};