* 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
*/
* @author Alex Beregszaszi
*/
-#define ALT_BITSTREAM_READER_LE
+#define BITSTREAM_READER_LE
//#define DEBUG
#include <limits.h>
#include "avcodec.h"
typedef struct TTAContext {
AVCodecContext *avctx;
+ AVFrame frame;
GetBitContext gb;
int format, channels, bps, data_length;
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 av_cold int tta_decode_init(AVCodecContext * avctx)
{
TTAContext *s = avctx->priv_data;
return AVERROR(EINVAL);
}
avctx->channels = s->channels = get_bits(&s->gb, 16);
+ if (s->channels > 1 && s->channels < 9)
+ avctx->channel_layout = tta_channel_layouts[s->channels-2];
avctx->bits_per_coded_sample = get_bits(&s->gb, 16);
s->bps = (avctx->bits_per_coded_sample + 7) / 8;
avctx->sample_rate = get_bits_long(&s->gb, 32);
s->data_length = get_bits_long(&s->gb, 32);
skip_bits(&s->gb, 32); // CRC32 of header
+ if (s->channels == 0) {
+ av_log(s->avctx, AV_LOG_ERROR, "Invalid number of channels\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;
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;
return -1;
}
- if (s->bps == 2) {
- s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
- if (!s->decode_buffer)
- return AVERROR(ENOMEM);
- }
+ s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
+ if (!s->decode_buffer)
+ return AVERROR(ENOMEM);
s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx));
if (!s->ch_ctx) {
av_freep(&s->decode_buffer);
return -1;
}
+ avcodec_get_frame_defaults(&s->frame);
+ avctx->coded_frame = &s->frame;
+
return 0;
}
-static int tta_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- AVPacket *avpkt)
+static int tta_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
TTAContext *s = avctx->priv_data;
- int i, out_size;
+ int i, ret;
int cur_chan = 0, framelen = s->frame_length;
int32_t *p;
if (!s->total_frames && s->last_frame_length)
framelen = s->last_frame_length;
- out_size = framelen * s->channels * av_get_bytes_per_sample(avctx->sample_fmt);
- if (*data_size < out_size) {
- av_log(avctx, AV_LOG_ERROR, "Output buffer size is too small.\n");
- return -1;
+ /* get output buffer */
+ s->frame.nb_samples = framelen;
+ if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
}
// decode directly to output buffer for 24-bit sample format
return -1;
skip_bits(&s->gb, 32); // frame crc
- // convert to output buffer
- if (s->bps == 2) {
- int16_t *samples = data;
- for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
- *samples++ = *p;
- } else {
- // shift samples for 24-bit sample format
- int32_t *samples = data;
- for (i = 0; i < framelen * s->channels; i++)
- *samples++ <<= 8;
- // reset decode buffer
- s->decode_buffer = NULL;
- }
+ // convert to output buffer
+ switch(s->bps) {
+ case 1: {
+ uint8_t *samples = (uint8_t *)s->frame.data[0];
+ for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
+ *samples++ = *p + 0x80;
+ break;
+ }
+ case 2: {
+ uint16_t *samples = (int16_t *)s->frame.data[0];
+ for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
+ *samples++ = *p;
+ break;
+ }
+ case 3: {
+ // shift samples for 24-bit sample format
+ int32_t *samples = (int32_t *)s->frame.data[0];
+ for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
+ *samples++ <<= 8;
+ // reset decode buffer
+ s->decode_buffer = NULL;
+ break;
+ }
+ default:
+ av_log(s->avctx, AV_LOG_ERROR, "Error, only 16bit samples supported!\n");
+ }
- *data_size = out_size;
+ *got_frame_ptr = 1;
+ *(AVFrame *)data = s->frame;
return buf_size;
}
.init = tta_decode_init,
.close = tta_decode_close,
.decode = tta_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("True Audio (TTA)"),
};
projects / ffmpeg / blobdiff