* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "parser.h"
#include "dca.h"
+#include "dca_syncwords.h"
+#include "get_bits.h"
+#include "parser.h"
typedef struct DCAParseContext {
ParseContext pc;
} DCAParseContext;
#define IS_MARKER(state, i, buf, buf_size) \
- ((state == DCA_MARKER_14B_LE && (i < buf_size-2) && (buf[i+1] & 0xF0) == 0xF0 && buf[i+2] == 0x07) \
- || (state == DCA_MARKER_14B_BE && (i < buf_size-2) && buf[i+1] == 0x07 && (buf[i+2] & 0xF0) == 0xF0) \
- || state == DCA_MARKER_RAW_LE || state == DCA_MARKER_RAW_BE)
+ ((state == DCA_SYNCWORD_CORE_14B_LE && (i < buf_size - 2) && (buf[i + 1] & 0xF0) == 0xF0 && buf[i + 2] == 0x07) || \
+ (state == DCA_SYNCWORD_CORE_14B_BE && (i < buf_size - 2) && buf[i + 1] == 0x07 && (buf[i + 2] & 0xF0) == 0xF0) || \
+ state == DCA_SYNCWORD_CORE_LE || state == DCA_SYNCWORD_CORE_BE)
/**
- * finds the end of the current frame in the bitstream.
+ * Find the end of the current frame in the bitstream.
* @return the position of the first byte of the next frame, or -1
*/
-static int dca_find_frame_end(DCAParseContext * pc1, const uint8_t * buf,
+static int dca_find_frame_end(DCAParseContext *pc1, const uint8_t *buf,
int buf_size)
{
int start_found, i;
ParseContext *pc = &pc1->pc;
start_found = pc->frame_start_found;
- state = pc->state;
+ state = pc->state;
i = 0;
if (!start_found) {
if (IS_MARKER(state, i, buf, buf_size)) {
if (pc1->lastmarker && state == pc1->lastmarker) {
start_found = 1;
+ i++;
break;
} else if (!pc1->lastmarker) {
- start_found = 1;
+ start_found = 1;
pc1->lastmarker = state;
+ i++;
break;
}
}
for (; i < buf_size; i++) {
pc1->size++;
state = (state << 8) | buf[i];
- if (state == DCA_HD_MARKER && !pc1->hd_pos)
+ if (state == DCA_SYNCWORD_SUBSTREAM && !pc1->hd_pos)
pc1->hd_pos = pc1->size;
if (state == pc1->lastmarker && IS_MARKER(state, i, buf, buf_size)) {
- if(pc1->framesize > pc1->size)
+ if (pc1->framesize > pc1->size)
continue;
- if(!pc1->framesize){
- pc1->framesize = pc1->hd_pos ? pc1->hd_pos : pc1->size;
- }
pc->frame_start_found = 0;
- pc->state = -1;
- pc1->size = 0;
+ pc->state = -1;
+ pc1->size = 0;
return i - 3;
}
}
}
pc->frame_start_found = start_found;
- pc->state = state;
+ pc->state = state;
return END_NOT_FOUND;
}
-static av_cold int dca_parse_init(AVCodecParserContext * s)
+static av_cold int dca_parse_init(AVCodecParserContext *s)
{
DCAParseContext *pc1 = s->priv_data;
return 0;
}
-static int dca_parse(AVCodecParserContext * s,
- AVCodecContext * avctx,
- const uint8_t ** poutbuf, int *poutbuf_size,
- const uint8_t * buf, int buf_size)
+static int dca_parse_params(const uint8_t *buf, int buf_size, int *duration,
+ int *sample_rate, int *framesize)
+{
+ GetBitContext gb;
+ uint8_t hdr[12 + FF_INPUT_BUFFER_PADDING_SIZE] = { 0 };
+ int ret, sample_blocks, sr_code;
+
+ if (buf_size < 12)
+ return AVERROR_INVALIDDATA;
+
+ if ((ret = ff_dca_convert_bitstream(buf, 12, hdr, 12)) < 0)
+ return ret;
+
+ init_get_bits(&gb, hdr, 96);
+
+ skip_bits_long(&gb, 39);
+ sample_blocks = get_bits(&gb, 7) + 1;
+ if (sample_blocks < 8)
+ return AVERROR_INVALIDDATA;
+ *duration = 256 * (sample_blocks / 8);
+
+ *framesize = get_bits(&gb, 14) + 1;
+ if (*framesize < 95)
+ return AVERROR_INVALIDDATA;
+
+ skip_bits(&gb, 6);
+ sr_code = get_bits(&gb, 4);
+ *sample_rate = avpriv_dca_sample_rates[sr_code];
+ if (*sample_rate == 0)
+ return AVERROR_INVALIDDATA;
+
+ return 0;
+}
+
+static int dca_parse(AVCodecParserContext *s, AVCodecContext *avctx,
+ const uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size)
{
DCAParseContext *pc1 = s->priv_data;
ParseContext *pc = &pc1->pc;
- int next;
+ int next, duration, sample_rate;
if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
next = buf_size;
next = dca_find_frame_end(pc1, buf, buf_size);
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
- *poutbuf = NULL;
+ *poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
}
- *poutbuf = buf;
+
+ /* read the duration and sample rate from the frame header */
+ if (!dca_parse_params(buf, buf_size, &duration, &sample_rate, &pc1->framesize)) {
+ s->duration = duration;
+ avctx->sample_rate = sample_rate;
+ } else
+ s->duration = 0;
+
+ *poutbuf = buf;
*poutbuf_size = buf_size;
return next;
}
AVCodecParser ff_dca_parser = {
- .codec_ids = { CODEC_ID_DTS },
+ .codec_ids = { AV_CODEC_ID_DTS },
.priv_data_size = sizeof(DCAParseContext),
.parser_init = dca_parse_init,
.parser_parse = dca_parse,