mpv/libmpcodecs/ad_hwac3.c

375 lines
7.9 KiB
C

// Reference: DOCS/tech/hwac3.txt !!!!!
/* DTS code based on "ac3/decode_dts.c" and "ac3/conversion.c" from "ogle 0.9"
(see http://www.dtek.chalmers.se/~dvd/)
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "config.h"
#ifdef USE_LIBA52
#include "mp_msg.h"
#include "help_mp.h"
#include "ad_internal.h"
#include "../liba52/a52.h"
static int isdts = -1;
static ad_info_t info =
{
"AC3/DTS pass-through SP/DIF",
"hwac3",
"Nick Kurshev/Peter Schüller",
"???",
""
};
LIBAD_EXTERN(hwac3)
static int dts_syncinfo(uint8_t *indata_ptr, int *flags, int *sample_rate, int *bit_rate);
static int decode_audio_dts(unsigned char *indata_ptr, int len, unsigned char *buf);
static int ac3dts_fillbuff(sh_audio_t *sh_audio)
{
int length = 0;
int flags = 0;
int sample_rate = 0;
int bit_rate = 0;
sh_audio->a_in_buffer_len = 0;
/* sync frame:*/
while(1)
{
// DTS has a 10 byte header
while(sh_audio->a_in_buffer_len < 10)
{
int c = demux_getc(sh_audio->ds);
if(c<0)
return -1; /* EOF*/
sh_audio->a_in_buffer[sh_audio->a_in_buffer_len++] = c;
}
length = dts_syncinfo(sh_audio->a_in_buffer, &flags, &sample_rate, &bit_rate);
if(length >= 10)
{
if(isdts != 1)
{
mp_msg(MSGT_DECAUDIO, MSGL_STATUS, "hwac3: switched to DTS, %d bps, %d Hz\n", bit_rate, sample_rate);
isdts = 1;
}
break;
}
length = a52_syncinfo(sh_audio->a_in_buffer, &flags, &sample_rate, &bit_rate);
if(length >= 7 && length <= 3840)
{
if(isdts != 0)
{
mp_msg(MSGT_DECAUDIO, MSGL_STATUS, "hwac3: switched to AC3, %d bps, %d Hz\n", bit_rate, sample_rate);
isdts = 0;
}
break; /* we're done.*/
}
/* bad file => resync*/
memcpy(sh_audio->a_in_buffer, sh_audio->a_in_buffer + 1, 9);
--sh_audio->a_in_buffer_len;
}
mp_msg(MSGT_DECAUDIO, MSGL_DBG2, "ac3dts: %s len=%d flags=0x%X %d Hz %d bit/s\n", isdts == 1 ? "DTS" : isdts == 0 ? "AC3" : "unknown", length, flags, sample_rate, bit_rate);
sh_audio->samplerate = sample_rate;
sh_audio->i_bps = bit_rate / 8;
demux_read_data(sh_audio->ds, sh_audio->a_in_buffer + 10, length - 10);
sh_audio->a_in_buffer_len = length;
// TODO: is DTS also checksummed?
if(isdts == 0 && crc16_block(sh_audio->a_in_buffer + 2, length - 2) != 0)
mp_msg(MSGT_DECAUDIO, MSGL_STATUS, "a52: CRC check failed! \n");
return length;
}
static int preinit(sh_audio_t *sh)
{
/* Dolby AC3 audio: */
sh->audio_out_minsize = 128 * 32 * 2 * 2; // DTS seems to need more than AC3
sh->audio_in_minsize = 8192;
sh->channels = 2;
sh->samplesize = 2;
sh->sample_format = AF_FORMAT_AC3;
return 1;
}
static int init(sh_audio_t *sh_audio)
{
/* Dolby AC3 passthrough:*/
sample_t *a52_samples = a52_init(0);
if(a52_samples == NULL)
{
mp_msg(MSGT_DECAUDIO, MSGL_ERR, "A52 init failed\n");
return 0;
}
if(ac3dts_fillbuff(sh_audio) < 0)
{
mp_msg(MSGT_DECAUDIO, MSGL_ERR, "AC3/DTS sync failed\n");
return 0;
}
return 1;
}
static void uninit(sh_audio_t *sh)
{
}
static int control(sh_audio_t *sh,int cmd,void* arg, ...)
{
switch(cmd)
{
case ADCTRL_SKIP_FRAME:
ac3dts_fillbuff(sh); break; // skip AC3 frame
return CONTROL_TRUE;
}
return CONTROL_UNKNOWN;
}
static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
{
int len = sh_audio->a_in_buffer_len;
if(len <= 0)
if((len = ac3dts_fillbuff(sh_audio)) <= 0)
return len; /*EOF*/
sh_audio->a_in_buffer_len = 0;
if(isdts == 1)
{
return decode_audio_dts(sh_audio->a_in_buffer, len, buf);
}
else if(isdts == 0)
{
buf[0] = 0x72;
buf[1] = 0xF8;
buf[2] = 0x1F;
buf[3] = 0x4E;
buf[4] = 0x01; //(length) ? data_type : 0; /* & 0x1F; */
buf[5] = 0x00;
buf[6] = (len << 3) & 0xFF;
buf[7] = (len >> 5) & 0xFF;
#ifdef WORDS_BIGENDIAN
memcpy(buf + 8, sh_audio->a_in_buffer, len); // untested
#else
swab(sh_audio->a_in_buffer, buf + 8, len);
#endif
memset(buf + 8 + len, 0, 6144 - 8 - len);
return 6144;
}
else
return -1;
}
static int DTS_SAMPLEFREQS[16] =
{
0,
8000,
16000,
32000,
64000,
128000,
11025,
22050,
44100,
88200,
176400,
12000,
24000,
48000,
96000,
192000
};
static int DTS_BITRATES[30] =
{
32000,
56000,
64000,
96000,
112000,
128000,
192000,
224000,
256000,
320000,
384000,
448000,
512000,
576000,
640000,
768000,
896000,
1024000,
1152000,
1280000,
1344000,
1408000,
1411200,
1472000,
1536000,
1920000,
2048000,
3072000,
3840000,
4096000
};
static int dts_decode_header(uint8_t *indata_ptr, int *rate, int *nblks, int *sfreq)
{
int ftype;
int surp;
int unknown_bit;
int fsize;
int amode;
if(((indata_ptr[0] << 24) | (indata_ptr[1] << 16) | (indata_ptr[2] << 8)
| (indata_ptr[3])) != 0x7ffe8001)
return -1;
ftype = indata_ptr[4] >> 7;
surp = (indata_ptr[4] >> 2) & 0x1f;
surp = (surp + 1) % 32;
unknown_bit = (indata_ptr[4] >> 1) & 0x01;
*nblks = (indata_ptr[4] & 0x01) << 6 | (indata_ptr[5] >> 2);
*nblks = *nblks + 1;
fsize = (indata_ptr[5] & 0x03) << 12 | (indata_ptr[6] << 4) | (indata_ptr[7] >> 4);
fsize = fsize + 1;
amode = (indata_ptr[7] & 0x0f) << 2 | (indata_ptr[8] >> 6);
*sfreq = (indata_ptr[8] >> 2) & 0x0f;
*rate = (indata_ptr[8] & 0x03) << 3 | ((indata_ptr[9] >> 5) & 0x07);
if(ftype != 1)
{
mp_msg(MSGT_DECAUDIO, MSGL_ERR, "DTS: Termination frames not handled, REPORT BUG\n");
return -1;
}
if(*sfreq != 13)
{
mp_msg(MSGT_DECAUDIO, MSGL_ERR, "DTS: Only 48kHz supported, REPORT BUG\n");
return -1;
}
if((fsize > 8192) || (fsize < 96))
{
mp_msg(MSGT_DECAUDIO, MSGL_ERR, "DTS: fsize: %d invalid, REPORT BUG\n", fsize);
return -1;
}
if(*nblks != 8 &&
*nblks != 16 &&
*nblks != 32 &&
*nblks != 64 &&
*nblks != 128 &&
ftype == 1)
{
mp_msg(MSGT_DECAUDIO, MSGL_ERR, "DTS: nblks %d not valid for normal frame, REPORT BUG\n", *nblks);
return -1;
}
return fsize;
}
static int dts_syncinfo(uint8_t *indata_ptr, int *flags, int *sample_rate, int *bit_rate)
{
int nblks;
int fsize;
int rate;
int sfreq;
fsize = dts_decode_header(indata_ptr, &rate, &nblks, &sfreq);
if(fsize >= 0)
{
if(rate >= 0 && rate <= 29)
*bit_rate = DTS_BITRATES[rate];
else
*bit_rate = 0;
if(sfreq >= 1 && sfreq <= 15)
*sample_rate = DTS_SAMPLEFREQS[sfreq];
else
*sample_rate = 0;
}
return fsize;
}
static int decode_audio_dts(unsigned char *indata_ptr, int len, unsigned char *buf)
{
int nblks;
int fsize;
int rate;
int sfreq;
int burst_len;
int nr_samples;
fsize = dts_decode_header(indata_ptr, &rate, &nblks, &sfreq);
if(fsize < 0)
return -1;
burst_len = fsize * 8;
nr_samples = nblks * 32;
buf[0] = 0x72; buf[1] = 0xf8; /* iec 61937 */
buf[2] = 0x1f; buf[3] = 0x4e; /* syncword */
switch(nr_samples)
{
case 512:
buf[4] = 0x0b; /* DTS-1 (512-sample bursts) */
break;
case 1024:
buf[4] = 0x0c; /* DTS-2 (1024-sample bursts) */
break;
case 2048:
buf[4] = 0x0d; /* DTS-3 (2048-sample bursts) */
break;
default:
mp_msg(MSGT_DECAUDIO, MSGL_ERR, "DTS: %d-sample bursts not supported\n", nr_samples);
buf[4] = 0x00;
break;
}
buf[5] = 0; /* ?? */
buf[6] = (burst_len) & 0xff;
buf[7] = (burst_len >> 8) & 0xff;
if(fsize + 8 > nr_samples * 2 * 2)
{
mp_msg(MSGT_DECAUDIO, MSGL_ERR, "DTS: more data than fits\n");
}
#ifdef WORDS_BIGENDIAN
memcpy(&buf[8], indata_ptr, fsize); // untested
#else
//TODO if fzise is odd, swab doesn't copy the last byte
swab(indata_ptr, &buf[8], fsize);
if (fsize & 1)
buf[8+fsize] = indata_ptr[fsize];
#endif
memset(&buf[fsize + 8], 0, nr_samples * 2 * 2 - (fsize + 8));
return nr_samples * 2 * 2;
}
#endif