* 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 "avcodec.h"
#include "parser.h"
#include "dca.h"
+#include "dca_parser.h"
+#include "get_bits.h"
+#include "put_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 (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;
+ if(!pc1->framesize){
+ pc1->framesize = pc1->hd_pos ? pc1->hd_pos : pc1->size;
+ }
pc->frame_start_found = 0;
pc->state = -1;
+ pc1->size = 0;
return i - 3;
}
}
return END_NOT_FOUND;
}
-static int dca_parse_init(AVCodecParserContext * s)
+static av_cold int dca_parse_init(AVCodecParserContext * s)
{
DCAParseContext *pc1 = s->priv_data;
return 0;
}
+int ff_dca_convert_bitstream(const uint8_t *src, int src_size, uint8_t *dst,
+ int max_size)
+{
+ uint32_t mrk;
+ int i, tmp;
+ const uint16_t *ssrc = (const uint16_t *) src;
+ uint16_t *sdst = (uint16_t *) dst;
+ PutBitContext pb;
+
+ if ((unsigned) src_size > (unsigned) max_size)
+ src_size = max_size;
+
+ mrk = AV_RB32(src);
+ switch (mrk) {
+ case DCA_MARKER_RAW_BE:
+ memcpy(dst, src, src_size);
+ return src_size;
+ case DCA_MARKER_RAW_LE:
+ for (i = 0; i < (src_size + 1) >> 1; i++)
+ *sdst++ = av_bswap16(*ssrc++);
+ return src_size;
+ case DCA_MARKER_14B_BE:
+ case DCA_MARKER_14B_LE:
+ init_put_bits(&pb, dst, max_size);
+ for (i = 0; i < (src_size + 1) >> 1; i++, src += 2) {
+ tmp = ((mrk == DCA_MARKER_14B_BE) ? AV_RB16(src) : AV_RL16(src)) & 0x3FFF;
+ put_bits(&pb, 14, tmp);
+ }
+ flush_put_bits(&pb);
+ return (put_bits_count(&pb) + 7) >> 3;
+ default:
+ return AVERROR_INVALIDDATA;
+ }
+}
+
+static int dca_parse_params(const uint8_t *buf, int buf_size, int *duration,
+ int *sample_rate)
+{
+ 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);
+
+ skip_bits(&gb, 20);
+ 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,
- uint8_t ** poutbuf, int *poutbuf_size,
+ 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;
} else {
next = dca_find_frame_end(pc1, buf, buf_size);
- if (ff_combine_frame(pc, next, (uint8_t **) & buf, &buf_size) < 0) {
+ if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
}
- *poutbuf = (uint8_t *) buf;
+
+ /* read the duration and sample rate from the frame header */
+ if (!dca_parse_params(buf, buf_size, &duration, &sample_rate)) {
+ s->duration = duration;
+ if (!avctx->sample_rate)
+ 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