mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-26 17:32:06 +00:00
233 lines
7.3 KiB
C
233 lines
7.3 KiB
C
/*
|
|
* TTA (The Lossless True Audio) encoder
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#define BITSTREAM_WRITER_LE
|
|
#include "ttadata.h"
|
|
#include "avcodec.h"
|
|
#include "put_bits.h"
|
|
#include "internal.h"
|
|
#include "libavutil/crc.h"
|
|
|
|
typedef struct TTAEncContext {
|
|
const AVCRC *crc_table;
|
|
int bps;
|
|
TTAChannel *ch_ctx;
|
|
} TTAEncContext;
|
|
|
|
static av_cold int tta_encode_init(AVCodecContext *avctx)
|
|
{
|
|
TTAEncContext *s = avctx->priv_data;
|
|
|
|
s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
|
|
|
|
switch (avctx->sample_fmt) {
|
|
case AV_SAMPLE_FMT_U8:
|
|
avctx->bits_per_raw_sample = 8;
|
|
break;
|
|
case AV_SAMPLE_FMT_S16:
|
|
avctx->bits_per_raw_sample = 16;
|
|
break;
|
|
case AV_SAMPLE_FMT_S32:
|
|
if (avctx->bits_per_raw_sample > 24)
|
|
av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n");
|
|
avctx->bits_per_raw_sample = 24;
|
|
}
|
|
|
|
s->bps = avctx->bits_per_raw_sample >> 3;
|
|
avctx->frame_size = 256 * avctx->sample_rate / 245;
|
|
|
|
s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx));
|
|
if (!s->ch_ctx)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void ttafilter_process(TTAFilter *c, int32_t *in)
|
|
{
|
|
register int32_t *dl = c->dl, *qm = c->qm, *dx = c->dx, sum = c->round;
|
|
|
|
if (c->error < 0) {
|
|
qm[0] -= dx[0]; qm[1] -= dx[1]; qm[2] -= dx[2]; qm[3] -= dx[3];
|
|
qm[4] -= dx[4]; qm[5] -= dx[5]; qm[6] -= dx[6]; qm[7] -= dx[7];
|
|
} else if (c->error > 0) {
|
|
qm[0] += dx[0]; qm[1] += dx[1]; qm[2] += dx[2]; qm[3] += dx[3];
|
|
qm[4] += dx[4]; qm[5] += dx[5]; qm[6] += dx[6]; qm[7] += dx[7];
|
|
}
|
|
|
|
sum += dl[0] * qm[0] + dl[1] * qm[1] + dl[2] * qm[2] + dl[3] * qm[3] +
|
|
dl[4] * qm[4] + dl[5] * qm[5] + dl[6] * qm[6] + dl[7] * qm[7];
|
|
|
|
dx[0] = dx[1]; dx[1] = dx[2]; dx[2] = dx[3]; dx[3] = dx[4];
|
|
dl[0] = dl[1]; dl[1] = dl[2]; dl[2] = dl[3]; dl[3] = dl[4];
|
|
|
|
dx[4] = ((dl[4] >> 30) | 1);
|
|
dx[5] = ((dl[5] >> 30) | 2) & ~1;
|
|
dx[6] = ((dl[6] >> 30) | 2) & ~1;
|
|
dx[7] = ((dl[7] >> 30) | 4) & ~3;
|
|
|
|
dl[4] = -dl[5]; dl[5] = -dl[6];
|
|
dl[6] = *in - dl[7]; dl[7] = *in;
|
|
dl[5] += dl[6]; dl[4] += dl[5];
|
|
|
|
*in -= (sum >> c->shift);
|
|
c->error = *in;
|
|
}
|
|
|
|
static int32_t get_sample(const AVFrame *frame, int sample,
|
|
enum AVSampleFormat format)
|
|
{
|
|
int32_t ret;
|
|
|
|
if (format == AV_SAMPLE_FMT_U8) {
|
|
ret = frame->data[0][sample] - 0x80;
|
|
} else if (format == AV_SAMPLE_FMT_S16) {
|
|
const int16_t *ptr = (const int16_t *)frame->data[0];
|
|
ret = ptr[sample];
|
|
} else {
|
|
const int32_t *ptr = (const int32_t *)frame->data[0];
|
|
ret = ptr[sample] >> 8;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int tta_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
|
|
const AVFrame *frame, int *got_packet_ptr)
|
|
{
|
|
TTAEncContext *s = avctx->priv_data;
|
|
PutBitContext pb;
|
|
int ret, i, out_bytes, cur_chan = 0, res = 0, samples = 0;
|
|
|
|
if ((ret = ff_alloc_packet2(avctx, avpkt, frame->nb_samples * 2 * avctx->channels * s->bps)) < 0)
|
|
return ret;
|
|
init_put_bits(&pb, avpkt->data, avpkt->size);
|
|
|
|
// init per channel states
|
|
for (i = 0; i < avctx->channels; i++) {
|
|
s->ch_ctx[i].predictor = 0;
|
|
ff_tta_filter_init(&s->ch_ctx[i].filter, ff_tta_filter_configs[s->bps - 1]);
|
|
ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10);
|
|
}
|
|
|
|
for (i = 0; i < frame->nb_samples * avctx->channels; i++) {
|
|
TTAChannel *c = &s->ch_ctx[cur_chan];
|
|
TTAFilter *filter = &c->filter;
|
|
TTARice *rice = &c->rice;
|
|
uint32_t k, unary, outval;
|
|
int32_t value, temp;
|
|
|
|
value = get_sample(frame, samples++, avctx->sample_fmt);
|
|
|
|
if (avctx->channels > 1) {
|
|
if (cur_chan < avctx->channels - 1)
|
|
value = res = get_sample(frame, samples, avctx->sample_fmt) - value;
|
|
else
|
|
value -= res / 2;
|
|
}
|
|
|
|
temp = value;
|
|
#define PRED(x, k) (int32_t)((((uint64_t)x << k) - x) >> k)
|
|
switch (s->bps) {
|
|
case 1: value -= PRED(c->predictor, 4); break;
|
|
case 2:
|
|
case 3: value -= PRED(c->predictor, 5); break;
|
|
}
|
|
c->predictor = temp;
|
|
|
|
ttafilter_process(filter, &value);
|
|
outval = (value > 0) ? (value << 1) - 1: -value << 1;
|
|
|
|
k = rice->k0;
|
|
|
|
rice->sum0 += outval - (rice->sum0 >> 4);
|
|
if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0])
|
|
rice->k0--;
|
|
else if (rice->sum0 > ff_tta_shift_16[rice->k0 + 1])
|
|
rice->k0++;
|
|
|
|
if (outval >= ff_tta_shift_1[k]) {
|
|
outval -= ff_tta_shift_1[k];
|
|
k = rice->k1;
|
|
|
|
rice->sum1 += outval - (rice->sum1 >> 4);
|
|
if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1])
|
|
rice->k1--;
|
|
else if (rice->sum1 > ff_tta_shift_16[rice->k1 + 1])
|
|
rice->k1++;
|
|
|
|
unary = 1 + (outval >> k);
|
|
do {
|
|
if (unary > 31) {
|
|
put_bits(&pb, 31, 0x7FFFFFFF);
|
|
unary -= 31;
|
|
} else {
|
|
put_bits(&pb, unary, (1 << unary) - 1);
|
|
unary = 0;
|
|
}
|
|
} while (unary);
|
|
}
|
|
|
|
put_bits(&pb, 1, 0);
|
|
|
|
if (k)
|
|
put_bits(&pb, k, outval & (ff_tta_shift_1[k] - 1));
|
|
|
|
if (cur_chan < avctx->channels - 1)
|
|
cur_chan++;
|
|
else
|
|
cur_chan = 0;
|
|
}
|
|
|
|
flush_put_bits(&pb);
|
|
out_bytes = put_bits_count(&pb) >> 3;
|
|
put_bits32(&pb, av_crc(s->crc_table, UINT32_MAX, avpkt->data, out_bytes) ^ UINT32_MAX);
|
|
flush_put_bits(&pb);
|
|
|
|
avpkt->pts = frame->pts;
|
|
avpkt->size = out_bytes + 4;
|
|
avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
|
|
*got_packet_ptr = 1;
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int tta_encode_close(AVCodecContext *avctx)
|
|
{
|
|
TTAEncContext *s = avctx->priv_data;
|
|
av_freep(&s->ch_ctx);
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_tta_encoder = {
|
|
.name = "tta",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.id = AV_CODEC_ID_TTA,
|
|
.priv_data_size = sizeof(TTAEncContext),
|
|
.init = tta_encode_init,
|
|
.close = tta_encode_close,
|
|
.encode2 = tta_encode_frame,
|
|
.capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_LOSSLESS,
|
|
.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_U8,
|
|
AV_SAMPLE_FMT_S16,
|
|
AV_SAMPLE_FMT_S32,
|
|
AV_SAMPLE_FMT_NONE },
|
|
.long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
|
|
};
|