ad_hwmpa: pass-through fake audio codec for hardware mpeg decoders

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@17398 b3059339-0415-0410-9bf9-f77b7e298cf2

etc/codecs.conf

@@ -2738,3 +2738,14 @@ audiocodec TwinVQ
   fourcc TWIN
   driver vqf
   dll "tvqdec.dll"
+
+audiocodec hwmpa
+  info "mpeg audio pass-through for hardware mpeg decoders"
+  status untested
+  comment "for hardware mpeg audio decoders"
+  format 0x50        ; layer-1 && layer-2
+  format 0x55        ; layer-3
+  format 0x33706d2e  ; ".mp3" CBR/VBR MP3 (MOV files)
+  format 0x5500736d  ; "ms\0\x55" older MP3 fourcc (MOV files)
+  format 0x2033504D  ; "MP3 " (used in .nsv files)
+  driver hwmpa

libmpcodecs/Makefile

@@ -7,6 +7,7 @@ LIBNAME2 = libmpencoders.a
 AUDIO_SRCS_LIB=ad_hwac3.c \
                ad_liba52.c \
                ad_mp3lib.c \
+               ad_hwmpa.c \
 
 AUDIO_SRCS_NAT=ad_alaw.c \
                ad_dk3adpcm.c \

libmpcodecs/ad.c

@@ -20,6 +20,7 @@ extern ad_functions_t mpcodecs_ad_mp3lib;
 extern ad_functions_t mpcodecs_ad_ffmpeg;
 extern ad_functions_t mpcodecs_ad_liba52;
 extern ad_functions_t mpcodecs_ad_hwac3;
+extern ad_functions_t mpcodecs_ad_hwmpa;
 extern ad_functions_t mpcodecs_ad_pcm;
 extern ad_functions_t mpcodecs_ad_dvdpcm;
 extern ad_functions_t mpcodecs_ad_alaw;
@@ -51,6 +52,7 @@ ad_functions_t* mpcodecs_ad_drivers[] =
   &mpcodecs_ad_liba52,
   &mpcodecs_ad_hwac3,
 #endif
+  &mpcodecs_ad_hwmpa,
 #ifdef USE_LIBAVCODEC
   &mpcodecs_ad_ffmpeg,
 #endif

libmpcodecs/ad_hwmpa.c

@@ -0,0 +1,136 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "config.h"
+
+#include "mp_msg.h"
+#include "help_mp.h"
+
+#include "libaf/af_format.h"
+#include "ad_internal.h"
+
+#include "libmpdemux/mp3_hdr.h"
+
+//based on ad_hwac3.c and ad_libmad.c
+static int isdts = -1;
+
+static ad_info_t info = 
+{
+	"MPEG audio pass-through (fake decoder)",
+	"hwmpa",
+	"NicoDVB",
+	"NicoDVB",
+	"For hardware decoders"
+};
+
+LIBAD_EXTERN(hwmpa)
+
+static int mpa_sync(sh_audio_t *sh, int no_frames, int *n, int *chans, int *srate, int *spf, int *mpa_layer, int *br)
+{
+	int cnt = 0, x = 0, len, frames_count;
+
+	frames_count = 0;
+	do
+	{
+		while(cnt + 4 < sh->a_in_buffer_len)
+		{
+			if(((sh->a_in_buffer[cnt] << 8) | sh->a_in_buffer[cnt+1]) & 0xffe0 != 0xffe0)
+				continue;
+			x = mp_get_mp3_header(&(sh->a_in_buffer[cnt]), chans, srate, spf, mpa_layer, br);
+			if(x > 0)
+			{
+				frames_count++;
+				if(frames_count == no_frames)
+				{
+					*n = x;
+					return cnt;
+				}
+			}
+			cnt++;
+		}
+		len = demux_read_data(sh->ds,&sh->a_in_buffer[sh->a_in_buffer_len],sh->a_in_buffer_size-sh->a_in_buffer_len);
+		if(len > 0)
+			sh->a_in_buffer_len += len;
+	} while(len > 0);
+	mp_msg(MSGT_DECAUDIO,MSGL_INFO,"Cannot sync MPA frame: %d\r\n", len);
+	return -1;
+}
+
+static int preinit(sh_audio_t *sh)
+{
+	sh->audio_out_minsize = 48;//check
+	sh->audio_in_minsize = 4608;//check
+	sh->sample_format = AF_FORMAT_MPEG2;
+	return 1;
+}
+
+static int init(sh_audio_t *sh)
+{
+	int cnt, chans, srate, spf, mpa_layer, br, len;
+
+	if((cnt = mpa_sync(sh, 1, &len, &chans, &srate, &spf, &mpa_layer, &br)) < 0)
+		return 0;
+
+	sh->channels = chans;
+	sh->samplerate = srate;
+	sh->i_bps = br * 125;
+	sh->samplesize = 2;
+	
+	mp_msg(MSGT_DECAUDIO,MSGL_V,"AC_HWMPA initialized, bitrate: %d kb/s\r\n", len);
+	return 1;
+}
+
+static int decode_audio(sh_audio_t *sh,unsigned char *buf,int minlen,int maxlen)
+{
+	int len, start, cnt2, tot;
+	int chans, srate, spf, mpa_layer, br;
+
+	tot = cnt2 = 0;
+	while(tot < minlen && tot+4608<=maxlen)
+	{
+		start = mpa_sync(sh, 1, &len, &chans, &srate, &spf, &mpa_layer, &br);
+		if(start < 0)
+			break;
+
+		if(start + len < sh->a_in_buffer_len && start + len >= maxlen)
+			break;
+		memcpy(&buf[cnt2], &(sh->a_in_buffer[start]), len);
+		cnt2 += len;
+		sh->a_in_buffer_len -= start + len;
+		memmove(sh->a_in_buffer, &(sh->a_in_buffer[start + len]), sh->a_in_buffer_len);
+		tot += start + len;
+	}
+
+	return tot;
+}
+
+
+static int control(sh_audio_t *sh,int cmd,void* arg, ...)
+{
+	int start, len, n;
+
+	switch(cmd)
+	{
+		case ADCTRL_RESYNC_STREAM:
+			if(mpa_sync(sh, 1, &len, NULL, NULL, NULL, NULL, NULL) >= 0)
+				return CONTROL_TRUE;
+			else
+				return CONTROL_FALSE;
+		case ADCTRL_SKIP_FRAME:
+			start = mpa_sync(sh, 2, &len, NULL, NULL, NULL, NULL, NULL);
+			if(len < 0)
+				return CONTROL_FALSE;
+
+			sh->a_in_buffer_len -= start;
+			memmove(sh->a_in_buffer, &(sh->a_in_buffer[start]), sh->a_in_buffer_len);
+			return CONTROL_TRUE;
+	}
+	return CONTROL_UNKNOWN;
+}
+
+
+static void uninit(sh_audio_t *sh)
+{
+}