* fixed-point AC-3 encoder.
*/
-#define CONFIG_FFT_FLOAT 0
+#define FFT_FLOAT 0
#undef CONFIG_AC3ENC_FLOAT
-#include "ac3enc.c"
+#include "internal.h"
+#include "audiodsp.h"
+#include "ac3enc.h"
+#include "eac3enc.h"
+#define AC3ENC_TYPE AC3ENC_TYPE_AC3_FIXED
+#include "ac3enc_opts_template.c"
+static const AVClass ac3enc_class = { "Fixed-Point AC-3 Encoder", av_default_item_name,
+ ac3_options, LIBAVUTIL_VERSION_INT };
-/**
- * Finalize MDCT and free allocated memory.
+/*
+ * Normalize the input samples to use the maximum available precision.
+ * This assumes signed 16-bit input samples.
*/
-static av_cold void mdct_end(AC3MDCTContext *mdct)
+static int normalize_samples(AC3EncodeContext *s)
{
- ff_mdct_end(&mdct->fft);
+ int v = s->ac3dsp.ac3_max_msb_abs_int16(s->windowed_samples, AC3_WINDOW_SIZE);
+ v = 14 - av_log2(v);
+ if (v > 0)
+ s->ac3dsp.ac3_lshift_int16(s->windowed_samples, AC3_WINDOW_SIZE, v);
+ /* +6 to right-shift from 31-bit to 25-bit */
+ return v + 6;
}
-/**
- * Initialize MDCT tables.
- * @param nbits log2(MDCT size)
+/*
+ * Scale MDCT coefficients to 25-bit signed fixed-point.
*/
-static av_cold int mdct_init(AVCodecContext *avctx, AC3MDCTContext *mdct,
- int nbits)
+static void scale_coefficients(AC3EncodeContext *s)
{
- int ret = ff_mdct_init(&mdct->fft, nbits, 0, -1.0);
- mdct->window = ff_ac3_window;
- return ret;
+ int blk, ch;
+
+ for (blk = 0; blk < s->num_blocks; blk++) {
+ AC3Block *block = &s->blocks[blk];
+ for (ch = 1; ch <= s->channels; ch++) {
+ s->ac3dsp.ac3_rshift_int32(block->mdct_coef[ch], AC3_MAX_COEFS,
+ block->coeff_shift[ch]);
+ }
+ }
}
-/**
- * Apply KBD window to input samples prior to MDCT.
+/*
+ * Clip MDCT coefficients to allowable range.
*/
-static void apply_window(DSPContext *dsp, int16_t *output, const int16_t *input,
- const int16_t *window, unsigned int len)
+static void clip_coefficients(AudioDSPContext *adsp, int32_t *coef,
+ unsigned int len)
{
- dsp->apply_window_int16(output, input, window, len);
+ adsp->vector_clip_int32(coef, coef, COEF_MIN, COEF_MAX, len);
}
-/**
- * Calculate the log2() of the maximum absolute value in an array.
- * @param tab input array
- * @param n number of values in the array
- * @return log2(max(abs(tab[])))
+/*
+ * Calculate a single coupling coordinate.
*/
-static int log2_tab(AC3EncodeContext *s, int16_t *src, int len)
+static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
{
- int v = s->ac3dsp.ac3_max_msb_abs_int16(src, len);
- return av_log2(v);
+ if (energy_cpl <= COEF_MAX) {
+ return 1048576;
+ } else {
+ uint64_t coord = energy_ch / (energy_cpl >> 24);
+ uint32_t coord32 = FFMIN(coord, 1073741824);
+ coord32 = ff_sqrt(coord32) << 9;
+ return FFMIN(coord32, COEF_MAX);
+ }
}
+#include "ac3enc_template.c"
+
+
/**
- * Normalize the input samples to use the maximum available precision.
- * This assumes signed 16-bit input samples.
+ * Finalize MDCT and free allocated memory.
*
- * @return exponent shift
+ * @param s AC-3 encoder private context
*/
-static int normalize_samples(AC3EncodeContext *s)
+av_cold void ff_ac3_fixed_mdct_end(AC3EncodeContext *s)
{
- int v = 14 - log2_tab(s, s->windowed_samples, AC3_WINDOW_SIZE);
- if (v > 0)
- s->ac3dsp.ac3_lshift_int16(s->windowed_samples, AC3_WINDOW_SIZE, v);
- /* +6 to right-shift from 31-bit to 25-bit */
- return v + 6;
+ ff_mdct_end(&s->mdct);
}
/**
- * Scale MDCT coefficients to 25-bit signed fixed-point.
+ * Initialize MDCT tables.
+ *
+ * @param s AC-3 encoder private context
+ * @return 0 on success, negative error code on failure
*/
-static void scale_coefficients(AC3EncodeContext *s)
+av_cold int ff_ac3_fixed_mdct_init(AC3EncodeContext *s)
{
- int blk, ch;
+ int ret = ff_mdct_init(&s->mdct, 9, 0, -1.0);
+ s->mdct_window = ff_ac3_window;
+ return ret;
+}
- for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
- AC3Block *block = &s->blocks[blk];
- for (ch = 1; ch <= s->channels; ch++) {
- s->ac3dsp.ac3_rshift_int32(block->mdct_coef[ch], AC3_MAX_COEFS,
- block->coeff_shift[ch]);
- }
- }
+
+static av_cold int ac3_fixed_encode_init(AVCodecContext *avctx)
+{
+ AC3EncodeContext *s = avctx->priv_data;
+ s->fixed_point = 1;
+ return ff_ac3_encode_init(avctx);
}
AVCodec ff_ac3_fixed_encoder = {
- "ac3_fixed",
- AVMEDIA_TYPE_AUDIO,
- CODEC_ID_AC3,
- sizeof(AC3EncodeContext),
- ac3_encode_init,
- ac3_encode_frame,
- ac3_encode_close,
- NULL,
- .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
- .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
- .priv_class = &ac3enc_class,
- .channel_layouts = ac3_channel_layouts,
+ .name = "ac3_fixed",
+ .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_AC3,
+ .priv_data_size = sizeof(AC3EncodeContext),
+ .init = ac3_fixed_encode_init,
+ .encode2 = ff_ac3_fixed_encode_frame,
+ .close = ff_ac3_encode_close,
+ .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16P,
+ AV_SAMPLE_FMT_NONE },
+ .priv_class = &ac3enc_class,
+ .channel_layouts = ff_ac3_channel_layouts,
+ .defaults = ac3_defaults,
};
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