*/
#define CONFIG_AC3ENC_FLOAT 1
+#include "internal.h"
+#include "audiodsp.h"
#include "ac3enc.h"
#include "eac3enc.h"
#include "kbdwin.h"
-#if CONFIG_AC3_ENCODER
#define AC3ENC_TYPE AC3ENC_TYPE_AC3
#include "ac3enc_opts_template.c"
-static AVClass ac3enc_class = { "AC-3 Encoder", av_default_item_name,
- ac3_options, LIBAVUTIL_VERSION_INT };
-#endif
+static const AVClass ac3enc_class = { "AC-3 Encoder", av_default_item_name,
+ ac3_options, LIBAVUTIL_VERSION_INT };
#include "ac3enc_template.c"
/**
* Finalize MDCT and free allocated memory.
+ *
+ * @param s AC-3 encoder private context
*/
-av_cold void ff_ac3_float_mdct_end(AC3MDCTContext *mdct)
+av_cold void ff_ac3_float_mdct_end(AC3EncodeContext *s)
{
- ff_mdct_end(&mdct->fft);
- av_freep(&mdct->window);
+ ff_mdct_end(&s->mdct);
+ av_freep(&s->mdct_window);
}
/**
* Initialize MDCT tables.
- * @param nbits log2(MDCT size)
+ *
+ * @param s AC-3 encoder private context
+ * @return 0 on success, negative error code on failure
*/
-av_cold int ff_ac3_float_mdct_init(AVCodecContext *avctx, AC3MDCTContext *mdct,
- int nbits)
+av_cold int ff_ac3_float_mdct_init(AC3EncodeContext *s)
{
float *window;
int i, n, n2;
- n = 1 << nbits;
+ n = 1 << 9;
n2 = n >> 1;
window = av_malloc(n * sizeof(*window));
if (!window) {
- av_log(avctx, AV_LOG_ERROR, "Cannot allocate memory.\n");
+ av_log(s->avctx, AV_LOG_ERROR, "Cannot allocate memory.\n");
return AVERROR(ENOMEM);
}
ff_kbd_window_init(window, 5.0, n2);
for (i = 0; i < n2; i++)
window[n-1-i] = window[i];
- mdct->window = window;
+ s->mdct_window = window;
- return ff_mdct_init(&mdct->fft, nbits, 0, -2.0 / n);
+ return ff_mdct_init(&s->mdct, 9, 0, -2.0 / n);
}
-/**
- * Apply KBD window to input samples prior to MDCT.
- */
-static void apply_window(DSPContext *dsp, float *output, const float *input,
- const float *window, unsigned int len)
-{
- dsp->vector_fmul(output, input, window, len);
-}
-
-
-/**
+/*
* Normalize the input samples.
* Not needed for the floating-point encoder.
*/
}
-/**
+/*
* Scale MDCT coefficients from float to 24-bit fixed-point.
*/
static void scale_coefficients(AC3EncodeContext *s)
{
- int chan_size = AC3_MAX_COEFS * AC3_MAX_BLOCKS;
- s->ac3dsp.float_to_fixed24(s->fixed_coef_buffer + chan_size,
- s->mdct_coef_buffer + chan_size,
- chan_size * s->channels);
+ int chan_size = AC3_MAX_COEFS * s->num_blocks;
+ int cpl = s->cpl_on;
+ s->ac3dsp.float_to_fixed24(s->fixed_coef_buffer + (chan_size * !cpl),
+ s->mdct_coef_buffer + (chan_size * !cpl),
+ chan_size * (s->channels + cpl));
+}
+
+
+/*
+ * Clip MDCT coefficients to allowable range.
+ */
+static void clip_coefficients(AudioDSPContext *adsp, float *coef,
+ unsigned int len)
+{
+ adsp->vector_clipf(coef, coef, COEF_MIN, COEF_MAX, len);
}
-#if CONFIG_AC3_ENCODER
+/*
+ * Calculate a single coupling coordinate.
+ */
+static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
+{
+ float coord = 0.125;
+ if (energy_cpl > 0)
+ coord *= sqrtf(energy_ch / energy_cpl);
+ return FFMIN(coord, COEF_MAX);
+}
+
+av_cold int ff_ac3_float_encode_init(AVCodecContext *avctx)
+{
+ AC3EncodeContext *s = avctx->priv_data;
+ avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
+ return ff_ac3_encode_init(avctx);
+}
+
AVCodec ff_ac3_encoder = {
- "ac3",
- AVMEDIA_TYPE_AUDIO,
- CODEC_ID_AC3,
- sizeof(AC3EncodeContext),
- ff_ac3_encode_init,
- ff_ac3_float_encode_frame,
- ff_ac3_encode_close,
- NULL,
- .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_FLT,AV_SAMPLE_FMT_NONE},
- .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
- .priv_class = &ac3enc_class,
+ .name = "ac3",
+ .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 = ff_ac3_float_encode_init,
+ .encode2 = ff_ac3_float_encode_frame,
+ .close = ff_ac3_encode_close,
+ .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
+ AV_SAMPLE_FMT_NONE },
+ .priv_class = &ac3enc_class,
.channel_layouts = ff_ac3_channel_layouts,
+ .defaults = ac3_defaults,
};
-#endif