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mp4ff: use faacDecInit2() to find the AAC track

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Use faacDecInit2() instead of AudioSpecificConfig() to detect the AAC
track in the MP4 file.  This has a great advantage: it initializes the
libfaad decoder, which the caller would normally do anyway - but now
we can go without the AudioSpecificConfig() call.  When decoder==NULL
(called from mp4_tag_dup()), fall back to a mp4ff_get_track_type()==1
check, like other audio players do.
This commit is contained in:
Max Kellermann 2009-02-18 18:39:12 +01:00
parent 111c73e701
commit 51c59f6228
2 changed files with 36 additions and 50 deletions
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1
configure.ac
View File

@ -812,7 +812,6 @@ int main() {
])
fi
if test x$enable_aac = xyes; then
AC_CHECK_TYPES(mp4AudioSpecificConfig,,,[#include <faad.h>])
AC_CHECK_MEMBERS([faacDecConfiguration.downMatrix,faacDecConfiguration.dontUpSampleImplicitSBR,faacDecFrameInfo.samplerate],,,[#include <faad.h>])
AC_DEFINE(HAVE_FAAD,1,[Define to use FAAD2 for AAC decoding])
else

85
src/decoder/mp4ff_plugin.c
View File

@ -38,39 +38,45 @@ struct mp4_context {
};
static int
mp4_get_aac_track(mp4ff_t * infile)
mp4_get_aac_track(mp4ff_t * infile, faacDecHandle decoder,
uint32_t *sample_rate, unsigned char *channels_r)
{
/* find AAC track */
#ifdef HAVE_FAAD_LONG
/* neaacdec.h declares all arguments as "unsigned long", but
internally expects uint32_t pointers. To avoid gcc
warnings, use this workaround. */
unsigned long *sample_rate_r = (unsigned long*)sample_rate;
#else
uint32_t *sample_rate_r = sample_rate;
#endif
int i, rc;
int num_tracks = mp4ff_total_tracks(infile);
for (i = 0; i < num_tracks; i++) {
unsigned char *buff = NULL;
unsigned int buff_size = 0;
#ifdef HAVE_MP4AUDIOSPECIFICCONFIG
mp4AudioSpecificConfig mp4ASC;
#else
unsigned long dummy1_32;
unsigned char dummy2_8, dummy3_8, dummy4_8, dummy5_8, dummy6_8,
dummy7_8, dummy8_8;
#endif
if (mp4ff_get_track_type(infile, i) != 1)
/* not an audio track */
continue;
if (decoder == NULL)
/* have don't have a decoder to initialize -
we're done now, because we found an audio
track */
return i;
mp4ff_get_decoder_config(infile, i, &buff, &buff_size);
if (buff == NULL)
continue;
if (buff) {
#ifdef HAVE_MP4AUDIOSPECIFICCONFIG
rc = AudioSpecificConfig(buff, buff_size, &mp4ASC);
#else
rc = AudioSpecificConfig(buff, &dummy1_32, &dummy2_8,
&dummy3_8, &dummy4_8,
&dummy5_8, &dummy6_8,
&dummy7_8, &dummy8_8);
#endif
free(buff);
if (rc < 0)
continue;
rc = faacDecInit2(decoder, buff, buff_size,
sample_rate_r, channels_r);
free(buff);
if (rc >= 0)
/* found a valid AAC track */
return i;
}
}
/* can't decode this */
@ -95,21 +101,12 @@ mp4_seek(void *user_data, uint64_t position)
}
static faacDecHandle
mp4_faad_new(mp4ff_t *mp4fh, int track, struct audio_format *audio_format)
mp4_faad_new(mp4ff_t *mp4fh, int *track_r, struct audio_format *audio_format)
{
faacDecHandle decoder;
faacDecConfigurationPtr config;
unsigned char *mp4_buffer;
unsigned int mp4_buffer_size;
int track;
uint32_t sample_rate;
#ifdef HAVE_FAAD_LONG
/* neaacdec.h declares all arguments as "unsigned long", but
internally expects uint32_t pointers. To avoid gcc
warnings, use this workaround. */
unsigned long *sample_rate_r = (unsigned long*)&sample_rate;
#else
uint32_t *sample_rate_r = &sample_rate;
#endif
unsigned char channels;
decoder = faacDecOpen();
@ -124,17 +121,14 @@ mp4_faad_new(mp4ff_t *mp4fh, int track, struct audio_format *audio_format)
#endif
faacDecSetConfiguration(decoder, config);
mp4_buffer = NULL;
mp4_buffer_size = 0;
mp4ff_get_decoder_config(mp4fh, track, &mp4_buffer, &mp4_buffer_size);
if (faacDecInit2(decoder, mp4_buffer, mp4_buffer_size,
sample_rate_r, &channels) < 0) {
g_warning("Not an AAC stream.\n");
track = mp4_get_aac_track(mp4fh, decoder, &sample_rate, &channels);
if (track < 0) {
g_warning("No AAC track found");
faacDecClose(decoder);
return NULL;
}
*track_r = track;
*audio_format = (struct audio_format){
.bits = 16,
.channels = channels,
@ -196,14 +190,7 @@ mp4_decode(struct decoder *mpd_decoder, struct input_stream *input_stream)
return;
}
track = mp4_get_aac_track(mp4fh);
if (track < 0) {
g_warning("No AAC track found in mp4 stream.\n");
mp4ff_close(mp4fh);
return;
}
decoder = mp4_faad_new(mp4fh, track, &audio_format);
decoder = mp4_faad_new(mp4fh, &track, &audio_format);
if (decoder == NULL) {
mp4ff_close(mp4fh);
return;
@ -374,7 +361,7 @@ mp4_tag_dup(const char *file)
return NULL;
}
track = mp4_get_aac_track(mp4fh);
track = mp4_get_aac_track(mp4fh, NULL, NULL, NULL);
if (track < 0) {
mp4ff_close(mp4fh);
input_stream_close(&input_stream);