generic-library/ffmpeg
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

get the number of blocks from the ac3 parser and use in the ac3 decoder.

Browse Source 
Originally committed as revision 13688 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2008-06-07 22:29:03 +00:00
parent 467ec3c120
commit 6730e9f300
3 changed files with 9 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
libavcodec/ac3.h
View File

@ -88,6 +88,7 @@ typedef struct {
int center_mix_level; ///< Center mix level index
int surround_mix_level; ///< Surround mix level index
uint16_t channel_map;
int num_blocks; ///< number of audio blocks
/** @} */
/** @defgroup derived Derived values

8
libavcodec/ac3_parser.c
View File

@ -49,7 +49,6 @@ static const uint8_t surround_levels[4] = { 2, 4, 0, 4 };
int ff_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr)
{
int frame_size_code;
int num_blocks;
memset(hdr, 0, sizeof(*hdr));
@ -62,6 +61,8 @@ int ff_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr)
if(hdr->bitstream_id > 16)
return AC3_PARSE_ERROR_BSID;
hdr->num_blocks = 6;
if(hdr->bitstream_id <= 10) {
/* Normal AC-3 */
hdr->crc1 = get_bits(gbc, 16);
@ -118,9 +119,8 @@ int ff_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr)
return AC3_PARSE_ERROR_SAMPLE_RATE;
hdr->sample_rate = ff_ac3_sample_rate_tab[sr_code2] / 2;
hdr->sr_shift = 1;
num_blocks = 6;
} else {
num_blocks = eac3_blocks[get_bits(gbc, 2)];
hdr->num_blocks = eac3_blocks[get_bits(gbc, 2)];
hdr->sample_rate = ff_ac3_sample_rate_tab[hdr->sr_code];
hdr->sr_shift = 0;
}
@ -129,7 +129,7 @@ int ff_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr)
hdr->lfe_on = get_bits1(gbc);
hdr->bit_rate = (uint32_t)(8.0 * hdr->frame_size * hdr->sample_rate /
(num_blocks * 256.0));
(hdr->num_blocks * 256.0));
hdr->channels = ff_ac3_channels_tab[hdr->channel_mode] + hdr->lfe_on;
}

6
libavcodec/ac3dec.c
View File

@ -111,6 +111,7 @@ static const uint8_t ac3_default_coeffs[8][5][2] = {
#define AC3_OUTPUT_LFEON 8
typedef struct {
int num_blocks; ///< number of audio blocks
int channel_mode; ///< channel mode (acmod)
int block_switch[AC3_MAX_CHANNELS]; ///< block switch flags
int dither_flag[AC3_MAX_CHANNELS]; ///< dither flags
@ -324,6 +325,7 @@ static int ac3_parse_header(AC3DecodeContext *s)
s->frame_size = hdr.frame_size;
s->center_mix_level = hdr.center_mix_level;
s->surround_mix_level = hdr.surround_mix_level;
s->num_blocks = hdr.num_blocks;
if(s->lfe_on) {
s->start_freq[s->lfe_ch] = 0;
@ -1206,7 +1208,7 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, int *data_size,
}
/* parse the audio blocks */
for (blk = 0; blk < NB_BLOCKS; blk++) {
for (blk = 0; blk < s->num_blocks; blk++) {
if (!err && ac3_parse_audio_block(s, blk)) {
av_log(avctx, AV_LOG_ERROR, "error parsing the audio block\n");
}
@ -1216,7 +1218,7 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data, int *data_size,
for (ch = 0; ch < s->out_channels; ch++)
*(out_samples++) = s->int_output[ch][i];
}
*data_size = NB_BLOCKS * 256 * avctx->channels * sizeof (int16_t);
*data_size = s->num_blocks * 256 * avctx->channels * sizeof (int16_t);
return s->frame_size;
}