* 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 "dca_syncwords.h"
+#include "get_bits.h"
+#include "parser.h"
typedef struct DCAParseContext {
ParseContext pc;
int framesize;
} 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)
+#define IS_CORE_MARKER(state) \
+ (((state & 0xFFFFFFFFF0FF) == (((uint64_t)DCA_SYNCWORD_CORE_14B_LE << 16) | 0xF007)) || \
+ ((state & 0xFFFFFFFFFFF0) == (((uint64_t)DCA_SYNCWORD_CORE_14B_BE << 16) | 0x07F0)) || \
+ ((state & 0xFFFFFFFF00FC) == (((uint64_t)DCA_SYNCWORD_CORE_LE << 16) | 0x00FC)) || \
+ ((state & 0xFFFFFFFFFC00) == (((uint64_t)DCA_SYNCWORD_CORE_BE << 16) | 0xFC00)))
+
+#define IS_EXSS_MARKER(state) ((state & 0xFFFFFFFF) == DCA_SYNCWORD_SUBSTREAM)
+
+#define IS_MARKER(state) (IS_CORE_MARKER(state) || IS_EXSS_MARKER(state))
+
+#define CORE_MARKER(state) ((state >> 16) & 0xFFFFFFFF)
+#define EXSS_MARKER(state) (state & 0xFFFFFFFF)
/**
- * 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;
- uint32_t state;
+ uint64_t state;
ParseContext *pc = &pc1->pc;
start_found = pc->frame_start_found;
- state = pc->state;
+ state = pc->state64;
i = 0;
if (!start_found) {
for (i = 0; i < buf_size; i++) {
state = (state << 8) | buf[i];
- if (IS_MARKER(state, i, buf, buf_size)) {
- if (pc1->lastmarker && state == pc1->lastmarker) {
- start_found = 1;
- break;
- } else if (!pc1->lastmarker) {
+ if (IS_MARKER(state)) {
+ if (!pc1->lastmarker ||
+ pc1->lastmarker == CORE_MARKER(state) ||
+ pc1->lastmarker == DCA_SYNCWORD_SUBSTREAM) {
start_found = 1;
- pc1->lastmarker = state;
+ if (IS_EXSS_MARKER(state))
+ pc1->lastmarker = EXSS_MARKER(state);
+ else
+ pc1->lastmarker = CORE_MARKER(state);
+ i++;
break;
}
}
for (; i < buf_size; i++) {
pc1->size++;
state = (state << 8) | buf[i];
- if (state == pc1->lastmarker && IS_MARKER(state, i, buf, buf_size) && (!pc1->framesize || pc1->framesize == pc1->size)) {
+ if (IS_MARKER(state) &&
+ (pc1->lastmarker == CORE_MARKER(state) ||
+ pc1->lastmarker == DCA_SYNCWORD_SUBSTREAM)) {
+ if (pc1->framesize > pc1->size)
+ continue;
pc->frame_start_found = 0;
- pc->state = -1;
- pc1->framesize = pc1->size;
- pc1->size = 0;
- return i - 3;
+ pc->state64 = -1;
+ pc1->size = 0;
+ return IS_EXSS_MARKER(state) ? i - 3 : i - 5;
}
}
}
pc->frame_start_found = start_found;
- pc->state = state;
+ pc->state64 = 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 + AV_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 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,
};
projects / ffmpeg / blobdiff