Revision 98c98e04 libavcodec/dca.c

View differences:

libavcodec/dca.c
35 35
#include "bitstream.h"
36 36
#include "dcadata.h"
37 37
#include "dcahuff.h"
38
#include "parser.h"
39

  
40
/** DCA syncwords, also used for bitstream type detection */
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//@{
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#define DCA_MARKER_RAW_BE 0x7FFE8001
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#define DCA_MARKER_RAW_LE 0xFE7F0180
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#define DCA_MARKER_14B_BE 0x1FFFE800
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#define DCA_MARKER_14B_LE 0xFF1F00E8
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//@}
38
#include "dca.h"
47 39

  
48 40
//#define TRACE
49 41

  
......
1255 1247
    .init = dca_decode_init,
1256 1248
    .decode = dca_decode_frame,
1257 1249
};
1258

  
1259
#ifdef CONFIG_DCA_PARSER
1260

  
1261
typedef struct DCAParseContext {
1262
    ParseContext pc;
1263
    uint32_t lastmarker;
1264
} DCAParseContext;
1265

  
1266
#define IS_MARKER(state, i, buf, buf_size) \
1267
 ((state == DCA_MARKER_14B_LE && (i < buf_size-2) && (buf[i+1] & 0xF0) == 0xF0 && buf[i+2] == 0x07) \
1268
 || (state == DCA_MARKER_14B_BE && (i < buf_size-2) && buf[i+1] == 0x07 && (buf[i+2] & 0xF0) == 0xF0) \
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 || state == DCA_MARKER_RAW_LE || state == DCA_MARKER_RAW_BE)
1270

  
1271
/**
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 * finds the end of the current frame in the bitstream.
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 * @return the position of the first byte of the next frame, or -1
1274
 */
1275
static int dca_find_frame_end(DCAParseContext * pc1, const uint8_t * buf,
1276
                              int buf_size)
1277
{
1278
    int start_found, i;
1279
    uint32_t state;
1280
    ParseContext *pc = &pc1->pc;
1281

  
1282
    start_found = pc->frame_start_found;
1283
    state = pc->state;
1284

  
1285
    i = 0;
1286
    if (!start_found) {
1287
        for (i = 0; i < buf_size; i++) {
1288
            state = (state << 8) | buf[i];
1289
            if (IS_MARKER(state, i, buf, buf_size)) {
1290
                if (pc1->lastmarker && state == pc1->lastmarker) {
1291
                    start_found = 1;
1292
                    break;
1293
                } else if (!pc1->lastmarker) {
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                    start_found = 1;
1295
                    pc1->lastmarker = state;
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                    break;
1297
                }
1298
            }
1299
        }
1300
    }
1301
    if (start_found) {
1302
        for (; i < buf_size; i++) {
1303
            state = (state << 8) | buf[i];
1304
            if (state == pc1->lastmarker && IS_MARKER(state, i, buf, buf_size)) {
1305
                pc->frame_start_found = 0;
1306
                pc->state = -1;
1307
                return i - 3;
1308
            }
1309
        }
1310
    }
1311
    pc->frame_start_found = start_found;
1312
    pc->state = state;
1313
    return END_NOT_FOUND;
1314
}
1315

  
1316
static int dca_parse_init(AVCodecParserContext * s)
1317
{
1318
    DCAParseContext *pc1 = s->priv_data;
1319

  
1320
    pc1->lastmarker = 0;
1321
    return 0;
1322
}
1323

  
1324
static int dca_parse(AVCodecParserContext * s,
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                     AVCodecContext * avctx,
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                     uint8_t ** poutbuf, int *poutbuf_size,
1327
                     const uint8_t * buf, int buf_size)
1328
{
1329
    DCAParseContext *pc1 = s->priv_data;
1330
    ParseContext *pc = &pc1->pc;
1331
    int next;
1332

  
1333
    if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
1334
        next = buf_size;
1335
    } else {
1336
        next = dca_find_frame_end(pc1, buf, buf_size);
1337

  
1338
        if (ff_combine_frame(pc, next, (uint8_t **) & buf, &buf_size) < 0) {
1339
            *poutbuf = NULL;
1340
            *poutbuf_size = 0;
1341
            return buf_size;
1342
        }
1343
    }
1344
    *poutbuf = (uint8_t *) buf;
1345
    *poutbuf_size = buf_size;
1346
    return next;
1347
}
1348

  
1349
AVCodecParser dca_parser = {
1350
    {CODEC_ID_DTS},
1351
    sizeof(DCAParseContext),
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    dca_parse_init,
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    dca_parse,
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    ff_parse_close,
1355
};
1356
#endif /* CONFIG_DCA_PARSER */

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