* @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;
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);
- if(avctx->sample_rate > 1000000){ //prevent FRAME_TIME * avctx->sample_rate from overflowing and sanity check
- av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
- return -1;
- }
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; break;
-// case 3: avctx->sample_fmt = AV_SAMPLE_FMT_S24; break;
- case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
- default:
- av_log_ask_for_sample(s->avctx,
- "Invalid/unsupported sample format.\n");
- return -1;
+ 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;
+ default:
+ av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");
+ return AVERROR_INVALIDDATA;
}
- // FIXME: horribly broken, but directly from reference source
-#define FRAME_TIME 1.04489795918367346939
- s->frame_length = (int)(FRAME_TIME * avctx->sample_rate);
+ // prevent overflow
+ if (avctx->sample_rate > 0x7FFFFF) {
+ av_log(avctx, AV_LOG_ERROR, "sample_rate too large\n");
+ return AVERROR(EINVAL);
+ }
+ s->frame_length = 256 * avctx->sample_rate / 245;
s->last_frame_length = s->data_length % s->frame_length;
s->total_frames = s->data_length / s->frame_length +
return -1;
}
- s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
+ 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->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx));
- if (!s->ch_ctx)
+ if (!s->ch_ctx) {
+ av_freep(&s->decode_buffer);
return AVERROR(ENOMEM);
+ }
} else {
av_log(avctx, AV_LOG_ERROR, "Wrong extradata present\n");
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;
+ 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;
- if (*data_size < (framelen * s->channels * 2)) {
- 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
+ if (s->bps == 3)
+ s->decode_buffer = s->frame.data[0];
+
// init per channel states
for (i = 0; i < s->channels; i++) {
s->ch_ctx[i].predictor = 0;
skip_bits(&s->gb, 32); // frame crc
// convert to output buffer
- switch(s->bps) {
- case 2: {
- uint16_t *samples = data;
- for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++) {
- *samples++ = *p;
- }
- *data_size = (uint8_t *)samples - (uint8_t *)data;
- break;
- }
- default:
- av_log(s->avctx, AV_LOG_ERROR, "Error, only 16bit samples supported!\n");
+ if (s->bps == 2) {
+ int16_t *samples = (int16_t *)s->frame.data[0];
+ 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 = (int32_t *)s->frame.data[0];
+ for (i = 0; i < framelen * s->channels; i++)
+ *samples++ <<= 8;
+ // reset decode buffer
+ s->decode_buffer = NULL;
}
+ *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)"),
};