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* modules/codec/twolame.c, modules/codec/ffmpeg/encoder.c: Added sanity

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checks for frequencies and bitrates in MPEG audio.
This commit is contained in:
Christophe Massiot 2005-08-01 14:50:42 +00:00
parent 2c50013e7f
commit 62e5a2bc19
2 changed files with 98 additions and 5 deletions
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61
modules/codec/ffmpeg/encoder.c
View File

@ -157,6 +157,15 @@ static const char *ppsz_enc_options[] = {
"chroma-elim-threshold", NULL
};
static const uint16_t mpa_bitrate_tab[2][15] =
{
{0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384},
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160}
};
static const uint16_t mpa_freq_tab[6] =
{ 44100, 48000, 32000, 22050, 24000, 16000 };
/*****************************************************************************
* OpenEncoder: probe the encoder
*****************************************************************************/
@ -516,17 +525,61 @@ int E_(OpenEncoder)( vlc_object_t *p_this )
if( avcodec_open( p_context, p_codec ) )
{
if( p_enc->fmt_in.i_cat == AUDIO_ES && p_context->channels > 2 )
if( p_enc->fmt_in.i_cat == AUDIO_ES &&
(p_context->channels > 2 || i_codec_id == CODEC_ID_MP2
|| i_codec_id == CODEC_ID_MP3) )
{
p_context->channels = 2;
p_enc->fmt_in.audio.i_channels = 2; // FIXME
if( p_context->channels > 2 )
{
p_context->channels = 2;
p_enc->fmt_in.audio.i_channels = 2; // FIXME
msg_Warn( p_enc, "stereo mode selected (codec limitation)" );
}
if( i_codec_id == CODEC_ID_MP2 || i_codec_id == CODEC_ID_MP3 )
{
int i_frequency, i;
for ( i_frequency = 0; i_frequency < 6; i_frequency++ )
{
if ( p_enc->fmt_out.audio.i_rate
== mpa_freq_tab[i_frequency] )
break;
}
if ( i_frequency == 6 )
{
msg_Err( p_enc, "MPEG audio doesn't support frequency=%d",
p_enc->fmt_out.audio.i_rate );
free( p_sys );
return VLC_EGENERIC;
}
for ( i = 1; i < 14; i++ )
{
if ( p_enc->fmt_out.i_bitrate / 1000
<= mpa_bitrate_tab[i_frequency / 3][i] )
break;
}
if ( p_enc->fmt_out.i_bitrate / 1000
!= mpa_bitrate_tab[i_frequency / 3][i] )
{
msg_Warn( p_enc,
"MPEG audio doesn't support bitrate=%d, using %d",
p_enc->fmt_out.i_bitrate,
mpa_bitrate_tab[i_frequency / 3][i] * 1000 );
p_enc->fmt_out.i_bitrate =
mpa_bitrate_tab[i_frequency / 3][i] * 1000;
p_context->bit_rate = p_enc->fmt_out.i_bitrate;
}
}
p_context->codec = NULL;
if( avcodec_open( p_context, p_codec ) )
{
msg_Err( p_enc, "cannot open encoder" );
free( p_sys );
return VLC_EGENERIC;
}
msg_Warn( p_enc, "stereo mode selected (codec limitation)" );
}
else
{

42
modules/codec/twolame.c
View File

@ -106,11 +106,21 @@ struct encoder_sys_t
/*****************************************************************************
* OpenEncoder: probe the encoder and return score
*****************************************************************************/
static const uint16_t mpa_bitrate_tab[2][15] =
{
{0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384},
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160}
};
static const uint16_t mpa_freq_tab[6] =
{ 44100, 48000, 32000, 22050, 24000, 16000 };
static int OpenEncoder( vlc_object_t *p_this )
{
encoder_t *p_enc = (encoder_t *)p_this;
encoder_sys_t *p_sys;
vlc_value_t val;
int i_frequency;
if( p_enc->fmt_out.i_codec != VLC_FOURCC('m','p','g','a') &&
p_enc->fmt_out.i_codec != VLC_FOURCC('m','p','2','a') &&
@ -126,6 +136,18 @@ static int OpenEncoder( vlc_object_t *p_this )
return VLC_EGENERIC;
}
for ( i_frequency = 0; i_frequency < 6; i_frequency++ )
{
if ( p_enc->fmt_out.audio.i_rate == mpa_freq_tab[i_frequency] )
break;
}
if ( i_frequency == 6 )
{
msg_Err( p_enc, "MPEG audio doesn't support frequency=%d",
p_enc->fmt_out.audio.i_rate );
return VLC_EGENERIC;
}
/* Allocate the memory needed to store the decoder's structure */
if( ( p_sys = (encoder_sys_t *)malloc(sizeof(encoder_sys_t)) ) == NULL )
{
@ -159,7 +181,25 @@ static int OpenEncoder( vlc_object_t *p_this )
}
else
{
twolame_set_bitrate( p_sys->p_twolame, p_enc->fmt_out.i_bitrate / 1000 );
int i;
for ( i = 1; i < 14; i++ )
{
if ( p_enc->fmt_out.i_bitrate / 1000
<= mpa_bitrate_tab[i_frequency / 3][i] )
break;
}
if ( p_enc->fmt_out.i_bitrate / 1000
!= mpa_bitrate_tab[i_frequency / 3][i] )
{
msg_Warn( p_enc, "MPEG audio doesn't support bitrate=%d, using %d",
p_enc->fmt_out.i_bitrate,
mpa_bitrate_tab[i_frequency / 3][i] * 1000 );
p_enc->fmt_out.i_bitrate = mpa_bitrate_tab[i_frequency / 3][i]
* 1000;
}
twolame_set_bitrate( p_sys->p_twolame,
p_enc->fmt_out.i_bitrate / 1000 );
}
if ( p_enc->fmt_in.audio.i_channels == 1 )