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Diffstat (limited to 'contrib/ffmpeg/libavcodec/alac.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/alac.c | 859 |
1 files changed, 0 insertions, 859 deletions
diff --git a/contrib/ffmpeg/libavcodec/alac.c b/contrib/ffmpeg/libavcodec/alac.c deleted file mode 100644 index cc87c81e5..000000000 --- a/contrib/ffmpeg/libavcodec/alac.c +++ /dev/null @@ -1,859 +0,0 @@ -/* - * ALAC (Apple Lossless Audio Codec) decoder - * Copyright (c) 2005 David Hammerton - * All rights reserved. - * - * 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 alac.c - * ALAC (Apple Lossless Audio Codec) decoder - * @author 2005 David Hammerton - * - * For more information on the ALAC format, visit: - * http://crazney.net/programs/itunes/alac.html - * - * Note: This decoder expects a 36- (0x24-)byte QuickTime atom to be - * passed through the extradata[_size] fields. This atom is tacked onto - * the end of an 'alac' stsd atom and has the following format: - * bytes 0-3 atom size (0x24), big-endian - * bytes 4-7 atom type ('alac', not the 'alac' tag from start of stsd) - * bytes 8-35 data bytes needed by decoder - * - * Extradata: - * 32bit size - * 32bit tag (=alac) - * 32bit zero? - * 32bit max sample per frame - * 8bit ?? (zero?) - * 8bit sample size - * 8bit history mult - * 8bit initial history - * 8bit kmodifier - * 8bit channels? - * 16bit ?? - * 32bit max coded frame size - * 32bit bitrate? - * 32bit samplerate - */ - - -#include "avcodec.h" -#include "bitstream.h" - -#define ALAC_EXTRADATA_SIZE 36 - -typedef struct { - - AVCodecContext *avctx; - GetBitContext gb; - /* init to 0; first frame decode should initialize from extradata and - * set this to 1 */ - int context_initialized; - - int samplesize; - int numchannels; - int bytespersample; - - /* buffers */ - int32_t *predicterror_buffer_a; - int32_t *predicterror_buffer_b; - - int32_t *outputsamples_buffer_a; - int32_t *outputsamples_buffer_b; - - /* stuff from setinfo */ - uint32_t setinfo_max_samples_per_frame; /* 0x1000 = 4096 */ /* max samples per frame? */ - uint8_t setinfo_7a; /* 0x00 */ - uint8_t setinfo_sample_size; /* 0x10 */ - uint8_t setinfo_rice_historymult; /* 0x28 */ - uint8_t setinfo_rice_initialhistory; /* 0x0a */ - uint8_t setinfo_rice_kmodifier; /* 0x0e */ - uint8_t setinfo_7f; /* 0x02 */ - uint16_t setinfo_80; /* 0x00ff */ - uint32_t setinfo_82; /* 0x000020e7 */ - uint32_t setinfo_86; /* 0x00069fe4 */ - uint32_t setinfo_8a_rate; /* 0x0000ac44 */ - /* end setinfo stuff */ - -} ALACContext; - -static void allocate_buffers(ALACContext *alac) -{ - alac->predicterror_buffer_a = av_malloc(alac->setinfo_max_samples_per_frame * 4); - alac->predicterror_buffer_b = av_malloc(alac->setinfo_max_samples_per_frame * 4); - - alac->outputsamples_buffer_a = av_malloc(alac->setinfo_max_samples_per_frame * 4); - alac->outputsamples_buffer_b = av_malloc(alac->setinfo_max_samples_per_frame * 4); -} - -static int alac_set_info(ALACContext *alac) -{ - unsigned char *ptr = alac->avctx->extradata; - - ptr += 4; /* size */ - ptr += 4; /* alac */ - ptr += 4; /* 0 ? */ - - if(AV_RB32(ptr) >= UINT_MAX/4){ - av_log(alac->avctx, AV_LOG_ERROR, "setinfo_max_samples_per_frame too large\n"); - return -1; - } - alac->setinfo_max_samples_per_frame = AV_RB32(ptr); /* buffer size / 2 ? */ - ptr += 4; - alac->setinfo_7a = *ptr++; - alac->setinfo_sample_size = *ptr++; - alac->setinfo_rice_historymult = *ptr++; - alac->setinfo_rice_initialhistory = *ptr++; - alac->setinfo_rice_kmodifier = *ptr++; - alac->setinfo_7f = *ptr++; // channels? - alac->setinfo_80 = AV_RB16(ptr); - ptr += 2; - alac->setinfo_82 = AV_RB32(ptr); // max coded frame size - ptr += 4; - alac->setinfo_86 = AV_RB32(ptr); // bitrate ? - ptr += 4; - alac->setinfo_8a_rate = AV_RB32(ptr); // samplerate - ptr += 4; - - allocate_buffers(alac); - - return 0; -} - -/* hideously inefficient. could use a bitmask search, - * alternatively bsr on x86, - */ -static int count_leading_zeros(int32_t input) -{ - int i = 0; - while (!(0x80000000 & input) && i < 32) { - i++; - input = input << 1; - } - return i; -} - -static void bastardized_rice_decompress(ALACContext *alac, - int32_t *output_buffer, - int output_size, - int readsamplesize, /* arg_10 */ - int rice_initialhistory, /* arg424->b */ - int rice_kmodifier, /* arg424->d */ - int rice_historymult, /* arg424->c */ - int rice_kmodifier_mask /* arg424->e */ - ) -{ - int output_count; - unsigned int history = rice_initialhistory; - int sign_modifier = 0; - - for (output_count = 0; output_count < output_size; output_count++) { - int32_t x = 0; - int32_t x_modified; - int32_t final_val; - - /* read x - number of 1s before 0 represent the rice */ - while (x <= 8 && get_bits1(&alac->gb)) { - x++; - } - - - if (x > 8) { /* RICE THRESHOLD */ - /* use alternative encoding */ - int32_t value; - - value = get_bits(&alac->gb, readsamplesize); - - /* mask value to readsamplesize size */ - if (readsamplesize != 32) - value &= (0xffffffff >> (32 - readsamplesize)); - - x = value; - } else { - /* standard rice encoding */ - int extrabits; - int k; /* size of extra bits */ - - /* read k, that is bits as is */ - k = 31 - rice_kmodifier - count_leading_zeros((history >> 9) + 3); - - if (k < 0) - k += rice_kmodifier; - else - k = rice_kmodifier; - - if (k != 1) { - extrabits = show_bits(&alac->gb, k); - - /* multiply x by 2^k - 1, as part of their strange algorithm */ - x = (x << k) - x; - - if (extrabits > 1) { - x += extrabits - 1; - get_bits(&alac->gb, k); - } else { - get_bits(&alac->gb, k - 1); - } - } - } - - x_modified = sign_modifier + x; - final_val = (x_modified + 1) / 2; - if (x_modified & 1) final_val *= -1; - - output_buffer[output_count] = final_val; - - sign_modifier = 0; - - /* now update the history */ - history += (x_modified * rice_historymult) - - ((history * rice_historymult) >> 9); - - if (x_modified > 0xffff) - history = 0xffff; - - /* special case: there may be compressed blocks of 0 */ - if ((history < 128) && (output_count+1 < output_size)) { - int block_size; - - sign_modifier = 1; - - x = 0; - while (x <= 8 && get_bits1(&alac->gb)) { - x++; - } - - if (x > 8) { - block_size = get_bits(&alac->gb, 16); - block_size &= 0xffff; - } else { - int k; - int extrabits; - - k = count_leading_zeros(history) + ((history + 16) >> 6 /* / 64 */) - 24; - - extrabits = show_bits(&alac->gb, k); - - block_size = (((1 << k) - 1) & rice_kmodifier_mask) * x - + extrabits - 1; - - if (extrabits < 2) { - x = 1 - extrabits; - block_size += x; - get_bits(&alac->gb, k - 1); - } else { - get_bits(&alac->gb, k); - } - } - - if (block_size > 0) { - memset(&output_buffer[output_count+1], 0, block_size * 4); - output_count += block_size; - - } - - if (block_size > 0xffff) - sign_modifier = 0; - - history = 0; - } - } -} - -#define SIGN_EXTENDED32(val, bits) ((val << (32 - bits)) >> (32 - bits)) - -#define SIGN_ONLY(v) \ - ((v < 0) ? (-1) : \ - ((v > 0) ? (1) : \ - (0))) - -static void predictor_decompress_fir_adapt(int32_t *error_buffer, - int32_t *buffer_out, - int output_size, - int readsamplesize, - int16_t *predictor_coef_table, - int predictor_coef_num, - int predictor_quantitization) -{ - int i; - - /* first sample always copies */ - *buffer_out = *error_buffer; - - if (!predictor_coef_num) { - if (output_size <= 1) return; - memcpy(buffer_out+1, error_buffer+1, (output_size-1) * 4); - return; - } - - if (predictor_coef_num == 0x1f) { /* 11111 - max value of predictor_coef_num */ - /* second-best case scenario for fir decompression, - * error describes a small difference from the previous sample only - */ - if (output_size <= 1) return; - for (i = 0; i < output_size - 1; i++) { - int32_t prev_value; - int32_t error_value; - - prev_value = buffer_out[i]; - error_value = error_buffer[i+1]; - buffer_out[i+1] = SIGN_EXTENDED32((prev_value + error_value), readsamplesize); - } - return; - } - - /* read warm-up samples */ - if (predictor_coef_num > 0) { - int i; - for (i = 0; i < predictor_coef_num; i++) { - int32_t val; - - val = buffer_out[i] + error_buffer[i+1]; - - val = SIGN_EXTENDED32(val, readsamplesize); - - buffer_out[i+1] = val; - } - } - -#if 0 - /* 4 and 8 are very common cases (the only ones i've seen). these - * should be unrolled and optimised - */ - if (predictor_coef_num == 4) { - /* FIXME: optimised general case */ - return; - } - - if (predictor_coef_table == 8) { - /* FIXME: optimised general case */ - return; - } -#endif - - - /* general case */ - if (predictor_coef_num > 0) { - for (i = predictor_coef_num + 1; - i < output_size; - i++) { - int j; - int sum = 0; - int outval; - int error_val = error_buffer[i]; - - for (j = 0; j < predictor_coef_num; j++) { - sum += (buffer_out[predictor_coef_num-j] - buffer_out[0]) * - predictor_coef_table[j]; - } - - outval = (1 << (predictor_quantitization-1)) + sum; - outval = outval >> predictor_quantitization; - outval = outval + buffer_out[0] + error_val; - outval = SIGN_EXTENDED32(outval, readsamplesize); - - buffer_out[predictor_coef_num+1] = outval; - - if (error_val > 0) { - int predictor_num = predictor_coef_num - 1; - - while (predictor_num >= 0 && error_val > 0) { - int val = buffer_out[0] - buffer_out[predictor_coef_num - predictor_num]; - int sign = SIGN_ONLY(val); - - predictor_coef_table[predictor_num] -= sign; - - val *= sign; /* absolute value */ - - error_val -= ((val >> predictor_quantitization) * - (predictor_coef_num - predictor_num)); - - predictor_num--; - } - } else if (error_val < 0) { - int predictor_num = predictor_coef_num - 1; - - while (predictor_num >= 0 && error_val < 0) { - int val = buffer_out[0] - buffer_out[predictor_coef_num - predictor_num]; - int sign = - SIGN_ONLY(val); - - predictor_coef_table[predictor_num] -= sign; - - val *= sign; /* neg value */ - - error_val -= ((val >> predictor_quantitization) * - (predictor_coef_num - predictor_num)); - - predictor_num--; - } - } - - buffer_out++; - } - } -} - -static void deinterlace_16(int32_t *buffer_a, int32_t *buffer_b, - int16_t *buffer_out, - int numchannels, int numsamples, - uint8_t interlacing_shift, - uint8_t interlacing_leftweight) -{ - int i; - if (numsamples <= 0) return; - - /* weighted interlacing */ - if (interlacing_leftweight) { - for (i = 0; i < numsamples; i++) { - int32_t difference, midright; - int16_t left; - int16_t right; - - midright = buffer_a[i]; - difference = buffer_b[i]; - - - right = midright - ((difference * interlacing_leftweight) >> interlacing_shift); - left = (midright - ((difference * interlacing_leftweight) >> interlacing_shift)) - + difference; - - buffer_out[i*numchannels] = left; - buffer_out[i*numchannels + 1] = right; - } - - return; - } - - /* otherwise basic interlacing took place */ - for (i = 0; i < numsamples; i++) { - int16_t left, right; - - left = buffer_a[i]; - right = buffer_b[i]; - - buffer_out[i*numchannels] = left; - buffer_out[i*numchannels + 1] = right; - } -} - -static int alac_decode_frame(AVCodecContext *avctx, - void *outbuffer, int *outputsize, - uint8_t *inbuffer, int input_buffer_size) -{ - ALACContext *alac = avctx->priv_data; - - int channels; - int32_t outputsamples; - - /* short-circuit null buffers */ - if (!inbuffer || !input_buffer_size) - return input_buffer_size; - - /* initialize from the extradata */ - if (!alac->context_initialized) { - if (alac->avctx->extradata_size != ALAC_EXTRADATA_SIZE) { - av_log(avctx, AV_LOG_ERROR, "alac: expected %d extradata bytes\n", - ALAC_EXTRADATA_SIZE); - return input_buffer_size; - } - if (alac_set_info(alac)) { - av_log(avctx, AV_LOG_ERROR, "alac: set_info failed\n"); - return input_buffer_size; - } - alac->context_initialized = 1; - } - - outputsamples = alac->setinfo_max_samples_per_frame; - - init_get_bits(&alac->gb, inbuffer, input_buffer_size * 8); - - channels = get_bits(&alac->gb, 3); - - *outputsize = outputsamples * alac->bytespersample; - - switch(channels) { - case 0: { /* 1 channel */ - int hassize; - int isnotcompressed; - int readsamplesize; - - int wasted_bytes; - int ricemodifier; - - - /* 2^result = something to do with output waiting. - * perhaps matters if we read > 1 frame in a pass? - */ - get_bits(&alac->gb, 4); - - get_bits(&alac->gb, 12); /* unknown, skip 12 bits */ - - hassize = get_bits(&alac->gb, 1); /* the output sample size is stored soon */ - - wasted_bytes = get_bits(&alac->gb, 2); /* unknown ? */ - - isnotcompressed = get_bits(&alac->gb, 1); /* whether the frame is compressed */ - - if (hassize) { - /* now read the number of samples, - * as a 32bit integer */ - outputsamples = get_bits(&alac->gb, 32); - *outputsize = outputsamples * alac->bytespersample; - } - - readsamplesize = alac->setinfo_sample_size - (wasted_bytes * 8); - - if (!isnotcompressed) { - /* so it is compressed */ - int16_t predictor_coef_table[32]; - int predictor_coef_num; - int prediction_type; - int prediction_quantitization; - int i; - - /* FIXME: skip 16 bits, not sure what they are. seem to be used in - * two channel case */ - get_bits(&alac->gb, 8); - get_bits(&alac->gb, 8); - - prediction_type = get_bits(&alac->gb, 4); - prediction_quantitization = get_bits(&alac->gb, 4); - - ricemodifier = get_bits(&alac->gb, 3); - predictor_coef_num = get_bits(&alac->gb, 5); - - /* read the predictor table */ - for (i = 0; i < predictor_coef_num; i++) { - predictor_coef_table[i] = (int16_t)get_bits(&alac->gb, 16); - } - - if (wasted_bytes) { - /* these bytes seem to have something to do with - * > 2 channel files. - */ - av_log(avctx, AV_LOG_ERROR, "FIXME: unimplemented, unhandling of wasted_bytes\n"); - } - - bastardized_rice_decompress(alac, - alac->predicterror_buffer_a, - outputsamples, - readsamplesize, - alac->setinfo_rice_initialhistory, - alac->setinfo_rice_kmodifier, - ricemodifier * alac->setinfo_rice_historymult / 4, - (1 << alac->setinfo_rice_kmodifier) - 1); - - if (prediction_type == 0) { - /* adaptive fir */ - predictor_decompress_fir_adapt(alac->predicterror_buffer_a, - alac->outputsamples_buffer_a, - outputsamples, - readsamplesize, - predictor_coef_table, - predictor_coef_num, - prediction_quantitization); - } else { - av_log(avctx, AV_LOG_ERROR, "FIXME: unhandled prediction type: %i\n", prediction_type); - /* i think the only other prediction type (or perhaps this is just a - * boolean?) runs adaptive fir twice.. like: - * predictor_decompress_fir_adapt(predictor_error, tempout, ...) - * predictor_decompress_fir_adapt(predictor_error, outputsamples ...) - * little strange.. - */ - } - - } else { - /* not compressed, easy case */ - if (readsamplesize <= 16) { - int i; - for (i = 0; i < outputsamples; i++) { - int32_t audiobits = get_bits(&alac->gb, readsamplesize); - - audiobits = SIGN_EXTENDED32(audiobits, readsamplesize); - - alac->outputsamples_buffer_a[i] = audiobits; - } - } else { - int i; - for (i = 0; i < outputsamples; i++) { - int32_t audiobits; - - audiobits = get_bits(&alac->gb, 16); - /* special case of sign extension.. - * as we'll be ORing the low 16bits into this */ - audiobits = audiobits << 16; - audiobits = audiobits >> (32 - readsamplesize); - - audiobits |= get_bits(&alac->gb, readsamplesize - 16); - - alac->outputsamples_buffer_a[i] = audiobits; - } - } - /* wasted_bytes = 0; // unused */ - } - - switch(alac->setinfo_sample_size) { - case 16: { - int i; - for (i = 0; i < outputsamples; i++) { - int16_t sample = alac->outputsamples_buffer_a[i]; - ((int16_t*)outbuffer)[i * alac->numchannels] = sample; - } - break; - } - case 20: - case 24: - case 32: - av_log(avctx, AV_LOG_ERROR, "FIXME: unimplemented sample size %i\n", alac->setinfo_sample_size); - break; - default: - break; - } - break; - } - case 1: { /* 2 channels */ - int hassize; - int isnotcompressed; - int readsamplesize; - - int wasted_bytes; - - uint8_t interlacing_shift; - uint8_t interlacing_leftweight; - - /* 2^result = something to do with output waiting. - * perhaps matters if we read > 1 frame in a pass? - */ - get_bits(&alac->gb, 4); - - get_bits(&alac->gb, 12); /* unknown, skip 12 bits */ - - hassize = get_bits(&alac->gb, 1); /* the output sample size is stored soon */ - - wasted_bytes = get_bits(&alac->gb, 2); /* unknown ? */ - - isnotcompressed = get_bits(&alac->gb, 1); /* whether the frame is compressed */ - - if (hassize) { - /* now read the number of samples, - * as a 32bit integer */ - outputsamples = get_bits(&alac->gb, 32); - *outputsize = outputsamples * alac->bytespersample; - } - - readsamplesize = alac->setinfo_sample_size - (wasted_bytes * 8) + 1; - - if (!isnotcompressed) { - /* compressed */ - int16_t predictor_coef_table_a[32]; - int predictor_coef_num_a; - int prediction_type_a; - int prediction_quantitization_a; - int ricemodifier_a; - - int16_t predictor_coef_table_b[32]; - int predictor_coef_num_b; - int prediction_type_b; - int prediction_quantitization_b; - int ricemodifier_b; - - int i; - - interlacing_shift = get_bits(&alac->gb, 8); - interlacing_leftweight = get_bits(&alac->gb, 8); - - /******** channel 1 ***********/ - prediction_type_a = get_bits(&alac->gb, 4); - prediction_quantitization_a = get_bits(&alac->gb, 4); - - ricemodifier_a = get_bits(&alac->gb, 3); - predictor_coef_num_a = get_bits(&alac->gb, 5); - - /* read the predictor table */ - for (i = 0; i < predictor_coef_num_a; i++) { - predictor_coef_table_a[i] = (int16_t)get_bits(&alac->gb, 16); - } - - /******** channel 2 *********/ - prediction_type_b = get_bits(&alac->gb, 4); - prediction_quantitization_b = get_bits(&alac->gb, 4); - - ricemodifier_b = get_bits(&alac->gb, 3); - predictor_coef_num_b = get_bits(&alac->gb, 5); - - /* read the predictor table */ - for (i = 0; i < predictor_coef_num_b; i++) { - predictor_coef_table_b[i] = (int16_t)get_bits(&alac->gb, 16); - } - - /*********************/ - if (wasted_bytes) { - /* see mono case */ - av_log(avctx, AV_LOG_ERROR, "FIXME: unimplemented, unhandling of wasted_bytes\n"); - } - - /* channel 1 */ - bastardized_rice_decompress(alac, - alac->predicterror_buffer_a, - outputsamples, - readsamplesize, - alac->setinfo_rice_initialhistory, - alac->setinfo_rice_kmodifier, - ricemodifier_a * alac->setinfo_rice_historymult / 4, - (1 << alac->setinfo_rice_kmodifier) - 1); - - if (prediction_type_a == 0) { - /* adaptive fir */ - predictor_decompress_fir_adapt(alac->predicterror_buffer_a, - alac->outputsamples_buffer_a, - outputsamples, - readsamplesize, - predictor_coef_table_a, - predictor_coef_num_a, - prediction_quantitization_a); - } else { - /* see mono case */ - av_log(avctx, AV_LOG_ERROR, "FIXME: unhandled prediction type: %i\n", prediction_type_a); - } - - /* channel 2 */ - bastardized_rice_decompress(alac, - alac->predicterror_buffer_b, - outputsamples, - readsamplesize, - alac->setinfo_rice_initialhistory, - alac->setinfo_rice_kmodifier, - ricemodifier_b * alac->setinfo_rice_historymult / 4, - (1 << alac->setinfo_rice_kmodifier) - 1); - - if (prediction_type_b == 0) { - /* adaptive fir */ - predictor_decompress_fir_adapt(alac->predicterror_buffer_b, - alac->outputsamples_buffer_b, - outputsamples, - readsamplesize, - predictor_coef_table_b, - predictor_coef_num_b, - prediction_quantitization_b); - } else { - av_log(avctx, AV_LOG_ERROR, "FIXME: unhandled prediction type: %i\n", prediction_type_b); - } - } else { - /* not compressed, easy case */ - if (alac->setinfo_sample_size <= 16) { - int i; - for (i = 0; i < outputsamples; i++) { - int32_t audiobits_a, audiobits_b; - - audiobits_a = get_bits(&alac->gb, alac->setinfo_sample_size); - audiobits_b = get_bits(&alac->gb, alac->setinfo_sample_size); - - audiobits_a = SIGN_EXTENDED32(audiobits_a, alac->setinfo_sample_size); - audiobits_b = SIGN_EXTENDED32(audiobits_b, alac->setinfo_sample_size); - - alac->outputsamples_buffer_a[i] = audiobits_a; - alac->outputsamples_buffer_b[i] = audiobits_b; - } - } else { - int i; - for (i = 0; i < outputsamples; i++) { - int32_t audiobits_a, audiobits_b; - - audiobits_a = get_bits(&alac->gb, 16); - audiobits_a = audiobits_a << 16; - audiobits_a = audiobits_a >> (32 - alac->setinfo_sample_size); - audiobits_a |= get_bits(&alac->gb, alac->setinfo_sample_size - 16); - - audiobits_b = get_bits(&alac->gb, 16); - audiobits_b = audiobits_b << 16; - audiobits_b = audiobits_b >> (32 - alac->setinfo_sample_size); - audiobits_b |= get_bits(&alac->gb, alac->setinfo_sample_size - 16); - - alac->outputsamples_buffer_a[i] = audiobits_a; - alac->outputsamples_buffer_b[i] = audiobits_b; - } - } - /* wasted_bytes = 0; */ - interlacing_shift = 0; - interlacing_leftweight = 0; - } - - switch(alac->setinfo_sample_size) { - case 16: { - deinterlace_16(alac->outputsamples_buffer_a, - alac->outputsamples_buffer_b, - (int16_t*)outbuffer, - alac->numchannels, - outputsamples, - interlacing_shift, - interlacing_leftweight); - break; - } - case 20: - case 24: - case 32: - av_log(avctx, AV_LOG_ERROR, "FIXME: unimplemented sample size %i\n", alac->setinfo_sample_size); - break; - default: - break; - } - - break; - } - } - - return input_buffer_size; -} - -static int alac_decode_init(AVCodecContext * avctx) -{ - ALACContext *alac = avctx->priv_data; - alac->avctx = avctx; - alac->context_initialized = 0; - - alac->samplesize = alac->avctx->bits_per_sample; - alac->numchannels = alac->avctx->channels; - alac->bytespersample = (alac->samplesize / 8) * alac->numchannels; - - return 0; -} - -static int alac_decode_close(AVCodecContext *avctx) -{ - ALACContext *alac = avctx->priv_data; - - av_free(alac->predicterror_buffer_a); - av_free(alac->predicterror_buffer_b); - - av_free(alac->outputsamples_buffer_a); - av_free(alac->outputsamples_buffer_b); - - return 0; -} - -AVCodec alac_decoder = { - "alac", - CODEC_TYPE_AUDIO, - CODEC_ID_ALAC, - sizeof(ALACContext), - alac_decode_init, - NULL, - alac_decode_close, - alac_decode_frame, -}; |