Revision 67d979fe libavcodec/ac3enc.c
| libavcodec/ac3enc.c | ||
|---|---|---|
| 914 | 914 |
/** |
| 915 | 915 |
* Write the AC-3 frame header to the output bitstream. |
| 916 | 916 |
*/ |
| 917 |
static void output_frame_header(AC3EncodeContext *s, unsigned char *frame)
|
|
| 917 |
static void output_frame_header(AC3EncodeContext *s) |
|
| 918 | 918 |
{
|
| 919 |
init_put_bits(&s->pb, frame, AC3_MAX_CODED_FRAME_SIZE); |
|
| 920 |
|
|
| 921 | 919 |
put_bits(&s->pb, 16, 0x0b77); /* frame header */ |
| 922 | 920 |
put_bits(&s->pb, 16, 0); /* crc1: will be filled later */ |
| 923 | 921 |
put_bits(&s->pb, 2, s->bit_alloc.sr_code); |
| ... | ... | |
| 1295 | 1293 |
|
| 1296 | 1294 |
|
| 1297 | 1295 |
/** |
| 1296 |
* Write the frame to the output bitstream. |
|
| 1297 |
*/ |
|
| 1298 |
static void output_frame(AC3EncodeContext *s, |
|
| 1299 |
unsigned char *frame, |
|
| 1300 |
uint8_t exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS], |
|
| 1301 |
uint8_t encoded_exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS], |
|
| 1302 |
uint8_t bap[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS], |
|
| 1303 |
int32_t mdct_coef[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS], |
|
| 1304 |
int8_t exp_shift[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS]) |
|
| 1305 |
{
|
|
| 1306 |
int blk; |
|
| 1307 |
|
|
| 1308 |
init_put_bits(&s->pb, frame, AC3_MAX_CODED_FRAME_SIZE); |
|
| 1309 |
|
|
| 1310 |
output_frame_header(s); |
|
| 1311 |
|
|
| 1312 |
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
|
|
| 1313 |
output_audio_block(s, exp_strategy[blk], encoded_exp[blk], |
|
| 1314 |
bap[blk], mdct_coef[blk], exp_shift[blk], blk); |
|
| 1315 |
} |
|
| 1316 |
|
|
| 1317 |
output_frame_end(s); |
|
| 1318 |
} |
|
| 1319 |
|
|
| 1320 |
|
|
| 1321 |
/** |
|
| 1298 | 1322 |
* Encode a single AC-3 frame. |
| 1299 | 1323 |
*/ |
| 1300 | 1324 |
static int ac3_encode_frame(AVCodecContext *avctx, |
| ... | ... | |
| 1302 | 1326 |
{
|
| 1303 | 1327 |
AC3EncodeContext *s = avctx->priv_data; |
| 1304 | 1328 |
const int16_t *samples = data; |
| 1305 |
int blk; |
|
| 1306 | 1329 |
int16_t planar_samples[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE+AC3_FRAME_SIZE]; |
| 1307 | 1330 |
int32_t mdct_coef[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS]; |
| 1308 | 1331 |
uint8_t exp[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][AC3_MAX_COEFS]; |
| ... | ... | |
| 1323 | 1346 |
|
| 1324 | 1347 |
compute_bit_allocation(s, bap, encoded_exp, exp_strategy, frame_bits); |
| 1325 | 1348 |
|
| 1326 |
output_frame_header(s, frame); |
|
| 1327 |
|
|
| 1328 |
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
|
|
| 1329 |
output_audio_block(s, exp_strategy[blk], encoded_exp[blk], |
|
| 1330 |
bap[blk], mdct_coef[blk], exp_shift[blk], blk); |
|
| 1331 |
} |
|
| 1332 |
|
|
| 1333 |
output_frame_end(s); |
|
| 1349 |
output_frame(s, frame, exp_strategy, encoded_exp, bap, mdct_coef, exp_shift); |
|
| 1334 | 1350 |
|
| 1335 | 1351 |
return s->frame_size; |
| 1336 | 1352 |
} |
Also available in: Unified diff