* Copyright (C) 2006 Benjamin Larsson
* Copyright (C) 2007 Konstantin Shishkov
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-/**
- * @file dca_parser.c
- */
-
#include "parser.h"
#include "dca.h"
+#include "get_bits.h"
typedef struct DCAParseContext {
ParseContext pc;
uint32_t lastmarker;
+ int size;
+ int framesize;
+ int hd_pos;
} DCAParseContext;
#define IS_MARKER(state, i, buf, buf_size) \
|| state == DCA_MARKER_RAW_LE || state == DCA_MARKER_RAW_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,
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;
pc1->lastmarker = state;
+ i++;
break;
}
}
}
if (start_found) {
for (; i < buf_size; i++) {
+ pc1->size++;
state = (state << 8) | buf[i];
+ if (state == DCA_HD_MARKER && !pc1->hd_pos)
+ pc1->hd_pos = pc1->size;
if (state == pc1->lastmarker && IS_MARKER(state, i, buf, buf_size)) {
+ if(pc1->framesize > pc1->size)
+ continue;
pc->frame_start_found = 0;
pc->state = -1;
+ pc1->size = 0;
return i - 3;
}
}
return 0;
}
+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,
{
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;
return buf_size;
}
}
+
+ /* 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 dca_parser = {
- {CODEC_ID_DTS},
- sizeof(DCAParseContext),
- dca_parse_init,
- dca_parse,
- ff_parse_close,
+AVCodecParser ff_dca_parser = {
+ .codec_ids = { AV_CODEC_ID_DTS },
+ .priv_data_size = sizeof(DCAParseContext),
+ .parser_init = dca_parse_init,
+ .parser_parse = dca_parse,
+ .parser_close = ff_parse_close,
};