From 836e8b9ba0d80ce03b0664f97245f8f3ac43d145 Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Mon, 9 Jul 2012 10:23:47 -0400 Subject: [PATCH] alac: cosmetics: rename some ALACContext parameters --- libavcodec/alac.c | 127 +++++++++++++++++++++++----------------------- 1 file changed, 63 insertions(+), 64 deletions(-) diff --git a/libavcodec/alac.c b/libavcodec/alac.c index 699b86ad6f..4848ea218e 100644 --- a/libavcodec/alac.c +++ b/libavcodec/alac.c @@ -37,7 +37,7 @@ * 8bit sample size * 8bit history mult (40) * 8bit initial history (14) - * 8bit kmodifier (10) + * 8bit rice param limit (10) * 8bit channels * 16bit maxRun (255) * 32bit max coded frame size (0 means unknown) @@ -61,20 +61,18 @@ typedef struct { AVFrame frame; GetBitContext gb; - int numchannels; + int channels; /* buffers */ - int32_t *predicterror_buffer[MAX_CHANNELS]; - - int32_t *outputsamples_buffer[MAX_CHANNELS]; - + int32_t *predict_error_buffer[MAX_CHANNELS]; + int32_t *output_samples_buffer[MAX_CHANNELS]; int32_t *extra_bits_buffer[MAX_CHANNELS]; - uint32_t setinfo_max_samples_per_frame; - uint8_t setinfo_sample_size; - uint8_t setinfo_rice_historymult; - uint8_t setinfo_rice_initialhistory; - uint8_t setinfo_rice_kmodifier; + uint32_t max_samples_per_frame; + uint8_t sample_size; + uint8_t rice_history_mult; + uint8_t rice_initial_history; + uint8_t rice_limit; int extra_bits; /**< number of extra bits beyond 16-bit */ } ALACContext; @@ -109,13 +107,13 @@ static void bastardized_rice_decompress(ALACContext *alac, int32_t *output_buffer, int output_size, int readsamplesize, - int rice_initialhistory, - int rice_kmodifier, - int rice_historymult, + int rice_initial_history, + int rice_limit, + int rice_history_mult, int rice_kmodifier_mask) { int output_count; - unsigned int history = rice_initialhistory; + unsigned int history = rice_initial_history; int sign_modifier = 0; for (output_count = 0; output_count < output_size; output_count++) { @@ -128,7 +126,7 @@ static void bastardized_rice_decompress(ALACContext *alac, /* read k, that is bits as is */ k = av_log2((history >> 9) + 3); - x= decode_scalar(&alac->gb, k, rice_kmodifier, readsamplesize); + x= decode_scalar(&alac->gb, k, rice_limit, readsamplesize); x_modified = sign_modifier + x; final_val = (x_modified + 1) / 2; @@ -139,8 +137,8 @@ static void bastardized_rice_decompress(ALACContext *alac, sign_modifier = 0; /* now update the history */ - history += x_modified * rice_historymult - - ((history * rice_historymult) >> 9); + history += x_modified * rice_history_mult - + ((history * rice_history_mult) >> 9); if (x_modified > 0xffff) history = 0xffff; @@ -154,7 +152,7 @@ static void bastardized_rice_decompress(ALACContext *alac, k = 7 - av_log2(history) + ((history + 16) >> 6 /* / 64 */); - block_size= decode_scalar(&alac->gb, k, rice_kmodifier, 16); + block_size = decode_scalar(&alac->gb, k, rice_limit, 16); if (block_size > 0) { if(block_size >= output_size - output_count){ @@ -377,12 +375,13 @@ static int alac_decode_frame(AVCodecContext *avctx, void *data, if (hassize) { /* now read the number of samples as a 32bit integer */ outputsamples = get_bits_long(&alac->gb, 32); - if(outputsamples > alac->setinfo_max_samples_per_frame){ - av_log(avctx, AV_LOG_ERROR, "outputsamples %d > %d\n", outputsamples, alac->setinfo_max_samples_per_frame); + if (outputsamples > alac->max_samples_per_frame) { + av_log(avctx, AV_LOG_ERROR, "outputsamples %d > %d\n", + outputsamples, alac->max_samples_per_frame); return -1; } } else - outputsamples = alac->setinfo_max_samples_per_frame; + outputsamples = alac->max_samples_per_frame; /* get output buffer */ if (outputsamples > INT32_MAX) { @@ -395,7 +394,7 @@ static int alac_decode_frame(AVCodecContext *avctx, void *data, return ret; } - readsamplesize = alac->setinfo_sample_size - alac->extra_bits + channels - 1; + readsamplesize = alac->sample_size - alac->extra_bits + channels - 1; if (readsamplesize > MIN_CACHE_BITS) { av_log(avctx, AV_LOG_ERROR, "readsamplesize too big (%d)\n", readsamplesize); return -1; @@ -432,13 +431,13 @@ static int alac_decode_frame(AVCodecContext *avctx, void *data, } for (ch = 0; ch < channels; ch++) { bastardized_rice_decompress(alac, - alac->predicterror_buffer[ch], + alac->predict_error_buffer[ch], outputsamples, readsamplesize, - alac->setinfo_rice_initialhistory, - alac->setinfo_rice_kmodifier, - ricemodifier[ch] * alac->setinfo_rice_historymult / 4, - (1 << alac->setinfo_rice_kmodifier) - 1); + alac->rice_initial_history, + alac->rice_limit, + ricemodifier[ch] * alac->rice_history_mult / 4, + (1 << alac->rice_limit) - 1); /* adaptive FIR filter */ if (prediction_type[ch] == 15) { @@ -449,16 +448,16 @@ static int alac_decode_frame(AVCodecContext *avctx, void *data, * However, this prediction type is not currently used by the * reference encoder. */ - predictor_decompress_fir_adapt(alac->predicterror_buffer[ch], - alac->predicterror_buffer[ch], + predictor_decompress_fir_adapt(alac->predict_error_buffer[ch], + alac->predict_error_buffer[ch], outputsamples, readsamplesize, NULL, 31, 0); } else if (prediction_type[ch] > 0) { av_log(avctx, AV_LOG_WARNING, "unknown prediction type: %i\n", prediction_type[ch]); } - predictor_decompress_fir_adapt(alac->predicterror_buffer[ch], - alac->outputsamples_buffer[ch], + predictor_decompress_fir_adapt(alac->predict_error_buffer[ch], + alac->output_samples_buffer[ch], outputsamples, readsamplesize, predictor_coef_table[ch], predictor_coef_num[ch], @@ -468,8 +467,8 @@ static int alac_decode_frame(AVCodecContext *avctx, void *data, /* not compressed, easy case */ for (i = 0; i < outputsamples; i++) { for (ch = 0; ch < channels; ch++) { - alac->outputsamples_buffer[ch][i] = get_sbits_long(&alac->gb, - alac->setinfo_sample_size); + alac->output_samples_buffer[ch][i] = get_sbits_long(&alac->gb, + alac->sample_size); } } alac->extra_bits = 0; @@ -480,35 +479,35 @@ static int alac_decode_frame(AVCodecContext *avctx, void *data, av_log(avctx, AV_LOG_ERROR, "Error : Wrong End Of Frame\n"); if (channels == 2 && interlacing_leftweight) { - decorrelate_stereo(alac->outputsamples_buffer, outputsamples, + decorrelate_stereo(alac->output_samples_buffer, outputsamples, interlacing_shift, interlacing_leftweight); } if (alac->extra_bits) { - append_extra_bits(alac->outputsamples_buffer, alac->extra_bits_buffer, - alac->extra_bits, alac->numchannels, outputsamples); + append_extra_bits(alac->output_samples_buffer, alac->extra_bits_buffer, + alac->extra_bits, alac->channels, outputsamples); } - switch(alac->setinfo_sample_size) { + switch(alac->sample_size) { case 16: if (channels == 2) { - interleave_stereo_16(alac->outputsamples_buffer, + interleave_stereo_16(alac->output_samples_buffer, (int16_t *)alac->frame.data[0], outputsamples); } else { int16_t *outbuffer = (int16_t *)alac->frame.data[0]; for (i = 0; i < outputsamples; i++) { - outbuffer[i] = alac->outputsamples_buffer[0][i]; + outbuffer[i] = alac->output_samples_buffer[0][i]; } } break; case 24: if (channels == 2) { - interleave_stereo_24(alac->outputsamples_buffer, + interleave_stereo_24(alac->output_samples_buffer, (int32_t *)alac->frame.data[0], outputsamples); } else { int32_t *outbuffer = (int32_t *)alac->frame.data[0]; for (i = 0; i < outputsamples; i++) - outbuffer[i] = alac->outputsamples_buffer[0][i] << 8; + outbuffer[i] = alac->output_samples_buffer[0][i] << 8; } break; } @@ -527,9 +526,9 @@ static av_cold int alac_decode_close(AVCodecContext *avctx) ALACContext *alac = avctx->priv_data; int ch; - for (ch = 0; ch < alac->numchannels; ch++) { - av_freep(&alac->predicterror_buffer[ch]); - av_freep(&alac->outputsamples_buffer[ch]); + for (ch = 0; ch < alac->channels; ch++) { + av_freep(&alac->predict_error_buffer[ch]); + av_freep(&alac->output_samples_buffer[ch]); av_freep(&alac->extra_bits_buffer[ch]); } @@ -539,13 +538,13 @@ static av_cold int alac_decode_close(AVCodecContext *avctx) static int allocate_buffers(ALACContext *alac) { int ch; - for (ch = 0; ch < alac->numchannels; ch++) { - int buf_size = alac->setinfo_max_samples_per_frame * sizeof(int32_t); + for (ch = 0; ch < alac->channels; ch++) { + int buf_size = alac->max_samples_per_frame * sizeof(int32_t); - FF_ALLOC_OR_GOTO(alac->avctx, alac->predicterror_buffer[ch], + FF_ALLOC_OR_GOTO(alac->avctx, alac->predict_error_buffer[ch], buf_size, buf_alloc_fail); - FF_ALLOC_OR_GOTO(alac->avctx, alac->outputsamples_buffer[ch], + FF_ALLOC_OR_GOTO(alac->avctx, alac->output_samples_buffer[ch], buf_size, buf_alloc_fail); FF_ALLOC_OR_GOTO(alac->avctx, alac->extra_bits_buffer[ch], @@ -566,18 +565,18 @@ static int alac_set_info(ALACContext *alac) bytestream2_skipu(&gb, 12); // size:4, alac:4, version:4 - alac->setinfo_max_samples_per_frame = bytestream2_get_be32u(&gb); - if (alac->setinfo_max_samples_per_frame >= UINT_MAX/4){ + alac->max_samples_per_frame = bytestream2_get_be32u(&gb); + if (alac->max_samples_per_frame >= UINT_MAX/4){ av_log(alac->avctx, AV_LOG_ERROR, - "setinfo_max_samples_per_frame too large\n"); + "max_samples_per_frame too large\n"); return AVERROR_INVALIDDATA; } bytestream2_skipu(&gb, 1); // compatible version - alac->setinfo_sample_size = bytestream2_get_byteu(&gb); - alac->setinfo_rice_historymult = bytestream2_get_byteu(&gb); - alac->setinfo_rice_initialhistory = bytestream2_get_byteu(&gb); - alac->setinfo_rice_kmodifier = bytestream2_get_byteu(&gb); - alac->numchannels = bytestream2_get_byteu(&gb); + alac->sample_size = bytestream2_get_byteu(&gb); + alac->rice_history_mult = bytestream2_get_byteu(&gb); + alac->rice_initial_history = bytestream2_get_byteu(&gb); + alac->rice_limit = bytestream2_get_byteu(&gb); + alac->channels = bytestream2_get_byteu(&gb); bytestream2_get_be16u(&gb); // maxRun bytestream2_get_be32u(&gb); // max coded frame size bytestream2_get_be32u(&gb); // average bitrate @@ -603,24 +602,24 @@ static av_cold int alac_decode_init(AVCodecContext * avctx) return -1; } - switch (alac->setinfo_sample_size) { + switch (alac->sample_size) { case 16: avctx->sample_fmt = AV_SAMPLE_FMT_S16; break; case 24: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break; default: av_log_ask_for_sample(avctx, "Sample depth %d is not supported.\n", - alac->setinfo_sample_size); + alac->sample_size); return AVERROR_PATCHWELCOME; } - if (alac->numchannels < 1) { + if (alac->channels < 1) { av_log(avctx, AV_LOG_WARNING, "Invalid channel count\n"); - alac->numchannels = avctx->channels; + alac->channels = avctx->channels; } else { - if (alac->numchannels > MAX_CHANNELS) - alac->numchannels = avctx->channels; + if (alac->channels > MAX_CHANNELS) + alac->channels = avctx->channels; else - avctx->channels = alac->numchannels; + avctx->channels = alac->channels; } if (avctx->channels > MAX_CHANNELS) { av_log(avctx, AV_LOG_ERROR, "Unsupported channel count: %d\n",