mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
12 years ago
parent
2e67dde954
commit
514cb9bb92
7 changed files with 238 additions and 3 deletions
@ -0,0 +1,232 @@ |
||||
/*
|
||||
* 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 * 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)"), |
||||
}; |
||||
Loading…
Reference in new issue