mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-27 20:21:24 +00:00
lame: ensure parsed output
... by doing some basic parsing of encoded lame data.
This commit is contained in:
Mark Nauwelaerts
parent
9cc793c10b
commit
789fc8195d
2 changed files with 234 additions and 4 deletions
|
|
@ -573,6 +573,7 @@ gst_lame_set_format (GstAudioEncoder * enc, GstAudioInfo * info)
|
|||
"output samplerate %d is different from incoming samplerate %d",
|
||||
out_samplerate, lame->samplerate);
|
||||
}
|
||||
lame->out_samplerate = out_samplerate;
|
||||
|
||||
version = lame_get_version (lame->lgf);
|
||||
if (version == 0)
|
||||
|
|
@ -663,6 +664,10 @@ gst_lame_start (GstAudioEncoder * enc)
|
|||
{
|
||||
GstLame *lame = GST_LAME (enc);
|
||||
|
||||
if (!lame->adapter)
|
||||
lame->adapter = gst_adapter_new ();
|
||||
gst_adapter_clear (lame->adapter);
|
||||
|
||||
GST_DEBUG_OBJECT (lame, "start");
|
||||
return TRUE;
|
||||
}
|
||||
|
|
@ -674,6 +679,11 @@ gst_lame_stop (GstAudioEncoder * enc)
|
|||
|
||||
GST_DEBUG_OBJECT (lame, "stop");
|
||||
|
||||
if (lame->adapter) {
|
||||
g_object_unref (lame->adapter);
|
||||
lame->adapter = NULL;
|
||||
}
|
||||
|
||||
gst_lame_release_memory (lame);
|
||||
return TRUE;
|
||||
}
|
||||
|
|
@ -944,12 +954,209 @@ gst_lame_get_property (GObject * object, guint prop_id, GValue * value,
|
|||
}
|
||||
}
|
||||
|
||||
/* **** credits go to mpegaudioparse **** */
|
||||
|
||||
static const guint mp3types_bitrates[2][3][16] = {
|
||||
{
|
||||
{0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448,},
|
||||
{0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384,},
|
||||
{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320,}
|
||||
},
|
||||
{
|
||||
{0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256,},
|
||||
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160,},
|
||||
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160,}
|
||||
},
|
||||
};
|
||||
|
||||
static const guint mp3types_freqs[3][3] = { {44100, 48000, 32000},
|
||||
{22050, 24000, 16000},
|
||||
{11025, 12000, 8000}
|
||||
};
|
||||
|
||||
static inline guint
|
||||
mp3_type_frame_length_from_header (GstLame * lame, guint32 header,
|
||||
guint * put_version, guint * put_layer, guint * put_channels,
|
||||
guint * put_bitrate, guint * put_samplerate, guint * put_mode,
|
||||
guint * put_crc)
|
||||
{
|
||||
guint length;
|
||||
gulong mode, samplerate, bitrate, layer, channels, padding, crc;
|
||||
gulong version;
|
||||
gint lsf, mpg25;
|
||||
|
||||
if (header & (1 << 20)) {
|
||||
lsf = (header & (1 << 19)) ? 0 : 1;
|
||||
mpg25 = 0;
|
||||
} else {
|
||||
lsf = 1;
|
||||
mpg25 = 1;
|
||||
}
|
||||
|
||||
version = 1 + lsf + mpg25;
|
||||
|
||||
layer = 4 - ((header >> 17) & 0x3);
|
||||
|
||||
crc = (header >> 16) & 0x1;
|
||||
|
||||
bitrate = (header >> 12) & 0xF;
|
||||
bitrate = mp3types_bitrates[lsf][layer - 1][bitrate] * 1000;
|
||||
/* The caller has ensured we have a valid header, so bitrate can't be
|
||||
zero here. */
|
||||
g_assert (bitrate != 0);
|
||||
|
||||
samplerate = (header >> 10) & 0x3;
|
||||
samplerate = mp3types_freqs[lsf + mpg25][samplerate];
|
||||
|
||||
padding = (header >> 9) & 0x1;
|
||||
|
||||
mode = (header >> 6) & 0x3;
|
||||
channels = (mode == 3) ? 1 : 2;
|
||||
|
||||
switch (layer) {
|
||||
case 1:
|
||||
length = 4 * ((bitrate * 12) / samplerate + padding);
|
||||
break;
|
||||
case 2:
|
||||
length = (bitrate * 144) / samplerate + padding;
|
||||
break;
|
||||
default:
|
||||
case 3:
|
||||
length = (bitrate * 144) / (samplerate << lsf) + padding;
|
||||
break;
|
||||
}
|
||||
|
||||
GST_DEBUG_OBJECT (lame, "Calculated mp3 frame length of %u bytes", length);
|
||||
GST_DEBUG_OBJECT (lame, "samplerate = %lu, bitrate = %lu, version = %lu, "
|
||||
"layer = %lu, channels = %lu", samplerate, bitrate, version,
|
||||
layer, channels);
|
||||
|
||||
if (put_version)
|
||||
*put_version = version;
|
||||
if (put_layer)
|
||||
*put_layer = layer;
|
||||
if (put_channels)
|
||||
*put_channels = channels;
|
||||
if (put_bitrate)
|
||||
*put_bitrate = bitrate;
|
||||
if (put_samplerate)
|
||||
*put_samplerate = samplerate;
|
||||
if (put_mode)
|
||||
*put_mode = mode;
|
||||
if (put_crc)
|
||||
*put_crc = crc;
|
||||
|
||||
return length;
|
||||
}
|
||||
|
||||
static gboolean
|
||||
mp3_sync_check (GstLame * lame, unsigned long head)
|
||||
{
|
||||
GST_DEBUG_OBJECT (lame, "checking mp3 header 0x%08lx", head);
|
||||
/* if it's not a valid sync */
|
||||
if ((head & 0xffe00000) != 0xffe00000) {
|
||||
GST_WARNING_OBJECT (lame, "invalid sync");
|
||||
return FALSE;
|
||||
}
|
||||
/* if it's an invalid MPEG version */
|
||||
if (((head >> 19) & 3) == 0x1) {
|
||||
GST_WARNING_OBJECT (lame, "invalid MPEG version: 0x%lx", (head >> 19) & 3);
|
||||
return FALSE;
|
||||
}
|
||||
/* if it's an invalid layer */
|
||||
if (!((head >> 17) & 3)) {
|
||||
GST_WARNING_OBJECT (lame, "invalid layer: 0x%lx", (head >> 17) & 3);
|
||||
return FALSE;
|
||||
}
|
||||
/* if it's an invalid bitrate */
|
||||
if (((head >> 12) & 0xf) == 0x0) {
|
||||
GST_WARNING_OBJECT (lame, "invalid bitrate: 0x%lx."
|
||||
"Free format files are not supported yet", (head >> 12) & 0xf);
|
||||
return FALSE;
|
||||
}
|
||||
if (((head >> 12) & 0xf) == 0xf) {
|
||||
GST_WARNING_OBJECT (lame, "invalid bitrate: 0x%lx", (head >> 12) & 0xf);
|
||||
return FALSE;
|
||||
}
|
||||
/* if it's an invalid samplerate */
|
||||
if (((head >> 10) & 0x3) == 0x3) {
|
||||
GST_WARNING_OBJECT (lame, "invalid samplerate: 0x%lx", (head >> 10) & 0x3);
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
if ((head & 0x3) == 0x2) {
|
||||
/* Ignore this as there are some files with emphasis 0x2 that can
|
||||
* be played fine. See BGO #537235 */
|
||||
GST_WARNING_OBJECT (lame, "invalid emphasis: 0x%lx", head & 0x3);
|
||||
}
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
/* **** end mpegaudioparse **** */
|
||||
|
||||
static GstFlowReturn
|
||||
gst_lame_finish_frames (GstLame * lame)
|
||||
{
|
||||
gint av;
|
||||
guint header;
|
||||
GstFlowReturn result = GST_FLOW_OK;
|
||||
|
||||
/* limited parsing, we don't expect to lose sync here */
|
||||
while ((result == GST_FLOW_OK) &&
|
||||
((av = gst_adapter_available (lame->adapter)) > 4)) {
|
||||
guint rate, version, layer, size;
|
||||
GstBuffer *mp3_buf;
|
||||
const guint8 *data;
|
||||
|
||||
data = gst_adapter_peek (lame->adapter, 4);
|
||||
header = GST_READ_UINT32_BE (data);
|
||||
if (!mp3_sync_check (lame, header))
|
||||
goto invalid_header;
|
||||
|
||||
size = mp3_type_frame_length_from_header (lame, header, &version, &layer,
|
||||
NULL, NULL, &rate, NULL, NULL);
|
||||
|
||||
if (G_UNLIKELY (layer != 3 || rate != lame->out_samplerate)) {
|
||||
GST_DEBUG_OBJECT (lame,
|
||||
"unexpected mp3 header with (rate, layer): (%u, %u)",
|
||||
rate, version, layer);
|
||||
goto invalid_header;
|
||||
}
|
||||
|
||||
if (size > av) {
|
||||
/* pretty likely to occur when lame is holding back on us */
|
||||
GST_LOG_OBJECT (lame, "frame size %u (> %d)", size, av);
|
||||
break;
|
||||
}
|
||||
|
||||
/* should be ok now */
|
||||
mp3_buf = gst_adapter_take_buffer (lame->adapter, size);
|
||||
/* number of samples for MPEG-1, layer 3 */
|
||||
result = gst_audio_encoder_finish_frame (GST_AUDIO_ENCODER (lame),
|
||||
mp3_buf, version == 1 ? 1152 : 576);
|
||||
}
|
||||
|
||||
exit:
|
||||
return result;
|
||||
|
||||
/* ERRORS */
|
||||
invalid_header:
|
||||
{
|
||||
GST_ELEMENT_ERROR (lame, STREAM, ENCODE,
|
||||
("invalid lame mp3 sync header %08X", header), (NULL));
|
||||
result = GST_FLOW_ERROR;
|
||||
goto exit;
|
||||
}
|
||||
}
|
||||
|
||||
static GstFlowReturn
|
||||
gst_lame_flush_full (GstLame * lame, gboolean push)
|
||||
{
|
||||
GstBuffer *buf;
|
||||
gint size;
|
||||
GstFlowReturn result = GST_FLOW_OK;
|
||||
gint av;
|
||||
|
||||
if (!lame->lgf)
|
||||
return GST_FLOW_OK;
|
||||
|
|
@ -957,15 +1164,31 @@ gst_lame_flush_full (GstLame * lame, gboolean push)
|
|||
buf = gst_buffer_new_and_alloc (7200);
|
||||
size = lame_encode_flush (lame->lgf, GST_BUFFER_DATA (buf), 7200);
|
||||
|
||||
if (size > 0 && push) {
|
||||
if (size > 0) {
|
||||
GST_BUFFER_SIZE (buf) = size;
|
||||
GST_DEBUG_OBJECT (lame, "pushing final packet of %u bytes", size);
|
||||
result = gst_audio_encoder_finish_frame (GST_AUDIO_ENCODER (lame), buf, -1);
|
||||
GST_DEBUG_OBJECT (lame, "collecting final %d bytes", size);
|
||||
gst_adapter_push (lame->adapter, buf);
|
||||
} else {
|
||||
GST_DEBUG_OBJECT (lame, "no final packet (size=%d, push=%d)", size, push);
|
||||
gst_buffer_unref (buf);
|
||||
result = GST_FLOW_OK;
|
||||
}
|
||||
|
||||
if (push) {
|
||||
result = gst_lame_finish_frames (lame);
|
||||
} else {
|
||||
/* never mind */
|
||||
gst_adapter_clear (lame->adapter);
|
||||
}
|
||||
|
||||
/* either way, we expect nothing left */
|
||||
if ((av = gst_adapter_available (lame->adapter))) {
|
||||
/* should this be more fatal ?? */
|
||||
GST_WARNING_OBJECT (lame, "unparsed %d bytes left after flushing", av);
|
||||
/* clean up anyway */
|
||||
gst_adapter_clear (lame->adapter);
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
|
|
@ -1023,7 +1246,10 @@ gst_lame_handle_frame (GstAudioEncoder * enc, GstBuffer * buf)
|
|||
|
||||
if (G_LIKELY (mp3_size > 0)) {
|
||||
GST_BUFFER_SIZE (mp3_buf) = mp3_size;
|
||||
result = gst_audio_encoder_finish_frame (enc, mp3_buf, -1);
|
||||
/* unfortunately lame does not provide frame delineated output,
|
||||
* so collect output and parse into frames ... */
|
||||
gst_adapter_push (lame->adapter, mp3_buf);
|
||||
result = gst_lame_finish_frames (lame);
|
||||
} else {
|
||||
if (mp3_size < 0) {
|
||||
/* eat error ? */
|
||||
|
|
|
|||
|
|
@ -28,6 +28,7 @@ G_BEGIN_DECLS
|
|||
|
||||
#include <lame/lame.h>
|
||||
#include <gst/audio/gstaudioencoder.h>
|
||||
#include <gst/base/gstadapter.h>
|
||||
|
||||
#define GST_TYPE_LAME \
|
||||
(gst_lame_get_type())
|
||||
|
|
@ -54,6 +55,7 @@ struct _GstLame {
|
|||
/*< private >*/
|
||||
|
||||
gint samplerate;
|
||||
gint out_samplerate;
|
||||
gint num_channels;
|
||||
gboolean setup;
|
||||
|
||||
|
|
@ -91,6 +93,8 @@ struct _GstLame {
|
|||
gint preset;
|
||||
|
||||
lame_global_flags *lgf;
|
||||
|
||||
GstAdapter *adapter;
|
||||
};
|
||||
|
||||
struct _GstLameClass {
|
||||
|
|
|
|||
Loading…
Reference in a new issue