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-rw-r--r--libavcodec/tta.c193
1 files changed, 115 insertions, 78 deletions
diff --git a/libavcodec/tta.c b/libavcodec/tta.c
index f8ad34f190..0d1075098b 100644
--- a/libavcodec/tta.c
+++ b/libavcodec/tta.c
@@ -2,20 +2,20 @@
* TTA (The Lossless True Audio) decoder
* Copyright (c) 2006 Alex Beregszaszi
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -34,6 +34,8 @@
#include "get_bits.h"
#include "internal.h"
#include "libavutil/crc.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/opt.h"
#define FORMAT_SIMPLE 1
#define FORMAT_ENCRYPTED 2
@@ -57,6 +59,7 @@ typedef struct TTAChannel {
} TTAChannel;
typedef struct TTAContext {
+ AVClass *class;
AVCodecContext *avctx;
GetBitContext gb;
const AVCRC *crc_table;
@@ -67,6 +70,8 @@ typedef struct TTAContext {
int32_t *decode_buffer;
+ uint8_t crc_pass[8];
+ uint8_t *pass;
TTAChannel *ch_ctx;
} TTAContext;
@@ -92,74 +97,47 @@ static const int32_t ttafilter_configs[4] = {
12
};
-static void ttafilter_init(TTAFilter *c, int32_t shift) {
+static void ttafilter_init(TTAContext *s, TTAFilter *c, int32_t shift) {
memset(c, 0, sizeof(TTAFilter));
+ if (s->format == FORMAT_ENCRYPTED) {
+ int i;
+ for (i = 0; i < 8; i++)
+ c->qm[i] = sign_extend(s->crc_pass[i], 8);
+ }
c->shift = shift;
c->round = shift_1[shift-1];
// c->round = 1 << (shift - 1);
}
-// FIXME: copy paste from original
-static inline void memshl(register int32_t *a, register int32_t *b) {
- *a++ = *b++;
- *a++ = *b++;
- *a++ = *b++;
- *a++ = *b++;
- *a++ = *b++;
- *a++ = *b++;
- *a++ = *b++;
- *a = *b;
-}
-
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) {
- sum += *dl++ * *qm, qm++;
- sum += *dl++ * *qm, qm++;
- sum += *dl++ * *qm, qm++;
- sum += *dl++ * *qm, qm++;
- sum += *dl++ * *qm, qm++;
- sum += *dl++ * *qm, qm++;
- sum += *dl++ * *qm, qm++;
- sum += *dl++ * *qm, qm++;
- dx += 8;
- } else if(c->error < 0) {
- sum += *dl++ * (*qm -= *dx++), qm++;
- sum += *dl++ * (*qm -= *dx++), qm++;
- sum += *dl++ * (*qm -= *dx++), qm++;
- sum += *dl++ * (*qm -= *dx++), qm++;
- sum += *dl++ * (*qm -= *dx++), qm++;
- sum += *dl++ * (*qm -= *dx++), qm++;
- sum += *dl++ * (*qm -= *dx++), qm++;
- sum += *dl++ * (*qm -= *dx++), qm++;
- } else {
- sum += *dl++ * (*qm += *dx++), qm++;
- sum += *dl++ * (*qm += *dx++), qm++;
- sum += *dl++ * (*qm += *dx++), qm++;
- sum += *dl++ * (*qm += *dx++), qm++;
- sum += *dl++ * (*qm += *dx++), qm++;
- sum += *dl++ * (*qm += *dx++), qm++;
- sum += *dl++ * (*qm += *dx++), qm++;
- sum += *dl++ * (*qm += *dx++), qm++;
+ 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];
}
- *(dx-0) = ((*(dl-1) >> 30) | 1) << 2;
- *(dx-1) = ((*(dl-2) >> 30) | 1) << 1;
- *(dx-2) = ((*(dl-3) >> 30) | 1) << 1;
- *(dx-3) = ((*(dl-4) >> 30) | 1);
+ 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;
c->error = *in;
*in += (sum >> c->shift);
- *dl = *in;
- *(dl-1) = *dl - *(dl-1);
- *(dl-2) = *(dl-1) - *(dl-2);
- *(dl-3) = *(dl-2) - *(dl-3);
-
- memshl(c->dl, c->dl + 1);
- memshl(c->dx, c->dx + 1);
+ dl[4] = -dl[5]; dl[5] = -dl[6];
+ dl[6] = *in - dl[7]; dl[7] = *in;
+ dl[5] += dl[6]; dl[4] += dl[5];
}
static void rice_init(TTARice *c, uint32_t k0, uint32_t k1)
@@ -180,6 +158,16 @@ static int tta_get_unary(GetBitContext *gb)
return ret;
}
+static const int64_t tta_channel_layouts[7] = {
+ AV_CH_LAYOUT_STEREO,
+ AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY,
+ AV_CH_LAYOUT_QUAD,
+ 0,
+ AV_CH_LAYOUT_5POINT1_BACK,
+ AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER,
+ AV_CH_LAYOUT_7POINT1_WIDE
+};
+
static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
{
uint32_t crc, CRC;
@@ -194,6 +182,21 @@ static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
return 0;
}
+static uint64_t tta_check_crc64(uint8_t *pass)
+{
+ uint64_t crc = UINT64_MAX, poly = 0x42F0E1EBA9EA3693U;
+ uint8_t *end = pass + strlen(pass);
+ int i;
+
+ while (pass < end) {
+ crc ^= (uint64_t)*pass++ << 56;
+ for (i = 0; i < 8; i++)
+ crc = (crc << 1) ^ (poly & (((int64_t) crc) >> 63));
+ }
+
+ return crc ^ UINT64_MAX;
+}
+
static av_cold int tta_decode_init(AVCodecContext * avctx)
{
TTAContext *s = avctx->priv_data;
@@ -203,7 +206,7 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
// 30bytes includes a seektable with one frame
if (avctx->extradata_size < 30)
- return -1;
+ return AVERROR_INVALIDDATA;
init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8);
if (show_bits_long(&s->gb, 32) == AV_RL32("TTA1"))
@@ -218,37 +221,42 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
s->format = get_bits(&s->gb, 16);
if (s->format > 2) {
- av_log(s->avctx, AV_LOG_ERROR, "Invalid format\n");
- return -1;
+ av_log(avctx, AV_LOG_ERROR, "Invalid format\n");
+ return AVERROR_INVALIDDATA;
}
if (s->format == FORMAT_ENCRYPTED) {
- av_log_missing_feature(s->avctx, "Encrypted TTA", 0);
- return AVERROR_PATCHWELCOME;
+ if (!s->pass) {
+ av_log(avctx, AV_LOG_ERROR, "Missing password for encrypted stream. Please use the -password option\n");
+ return AVERROR(EINVAL);
+ }
+ AV_WL64(s->crc_pass, tta_check_crc64(s->pass));
}
avctx->channels = s->channels = get_bits(&s->gb, 16);
- avctx->bits_per_coded_sample = get_bits(&s->gb, 16);
- s->bps = (avctx->bits_per_coded_sample + 7) / 8;
+ if (s->channels > 1 && s->channels < 9)
+ avctx->channel_layout = tta_channel_layouts[s->channels-2];
+ avctx->bits_per_raw_sample = get_bits(&s->gb, 16);
+ s->bps = (avctx->bits_per_raw_sample + 7) / 8;
avctx->sample_rate = get_bits_long(&s->gb, 32);
s->data_length = get_bits_long(&s->gb, 32);
skip_bits_long(&s->gb, 32); // CRC32 of header
if (s->channels == 0) {
- av_log(s->avctx, AV_LOG_ERROR, "Invalid number of channels\n");
+ av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
return AVERROR_INVALIDDATA;
} else if (avctx->sample_rate == 0) {
- av_log(s->avctx, AV_LOG_ERROR, "Invalid samplerate\n");
+ av_log(avctx, AV_LOG_ERROR, "Invalid samplerate\n");
return AVERROR_INVALIDDATA;
}
switch(s->bps) {
+ case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
case 2:
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
- avctx->bits_per_raw_sample = 16;
break;
case 3:
avctx->sample_fmt = AV_SAMPLE_FMT_S32;
- avctx->bits_per_raw_sample = 24;
break;
+ //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
default:
av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");
return AVERROR_INVALIDDATA;
@@ -265,10 +273,10 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
total_frames = s->data_length / s->frame_length +
(s->last_frame_length ? 1 : 0);
- av_log(s->avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n",
+ av_log(avctx, AV_LOG_DEBUG, "format: %d chans: %d bps: %d rate: %d block: %d\n",
s->format, avctx->channels, avctx->bits_per_coded_sample, avctx->sample_rate,
avctx->block_align);
- av_log(s->avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
+ av_log(avctx, AV_LOG_DEBUG, "data_length: %d frame_length: %d last: %d total: %d\n",
s->data_length, s->frame_length, s->last_frame_length, total_frames);
// FIXME: seek table
@@ -284,14 +292,15 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
if(s->frame_length >= UINT_MAX / (s->channels * sizeof(int32_t))){
av_log(avctx, AV_LOG_ERROR, "frame_length too large\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
- if (s->bps == 2) {
+ if (s->bps < 3) {
s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
if (!s->decode_buffer)
return AVERROR(ENOMEM);
- }
+ } else
+ s->decode_buffer = NULL;
s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx));
if (!s->ch_ctx) {
av_freep(&s->decode_buffer);
@@ -299,7 +308,7 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
}
} else {
av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
return 0;
@@ -337,7 +346,7 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
// init per channel states
for (i = 0; i < s->channels; i++) {
s->ch_ctx[i].predictor = 0;
- ttafilter_init(&s->ch_ctx[i].filter, ttafilter_configs[s->bps-1]);
+ ttafilter_init(s, &s->ch_ctx[i].filter, ttafilter_configs[s->bps-1]);
rice_init(&s->ch_ctx[i].rice, 10, 10);
}
@@ -435,17 +444,28 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
skip_bits_long(&s->gb, 32); // frame crc
// convert to output buffer
- if (s->bps == 2) {
+ switch (s->bps) {
+ case 1: {
+ uint8_t *samples = (uint8_t *)frame->data[0];
+ for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
+ *samples++ = *p + 0x80;
+ break;
+ }
+ case 2: {
int16_t *samples = (int16_t *)frame->data[0];
for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
*samples++ = *p;
- } else {
+ break;
+ }
+ case 3: {
// shift samples for 24-bit sample format
int32_t *samples = (int32_t *)frame->data[0];
- for (i = 0; i < framelen * s->channels; i++)
+ for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
*samples++ <<= 8;
// reset decode buffer
s->decode_buffer = NULL;
+ break;
+ }
}
*got_frame_ptr = 1;
@@ -461,12 +481,28 @@ error:
static av_cold int tta_decode_close(AVCodecContext *avctx) {
TTAContext *s = avctx->priv_data;
- av_free(s->decode_buffer);
+ if (s->bps < 3)
+ av_free(s->decode_buffer);
+ s->decode_buffer = NULL;
av_freep(&s->ch_ctx);
return 0;
}
+#define OFFSET(x) offsetof(TTAContext, x)
+#define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
+static const AVOption options[] = {
+ { "password", "Set decoding password", OFFSET(pass), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, DEC },
+ { NULL },
+};
+
+static const AVClass tta_decoder_class = {
+ .class_name = "TTA Decoder",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
AVCodec ff_tta_decoder = {
.name = "tta",
.type = AVMEDIA_TYPE_AUDIO,
@@ -477,4 +513,5 @@ AVCodec ff_tta_decoder = {
.decode = tta_decode_frame,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
+ .priv_class = &tta_decoder_class,
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 08:46:49 +0000