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Diffstat (limited to 'src/libmad/xine_mad_decoder.c')
-rw-r--r--src/libmad/xine_mad_decoder.c64
1 files changed, 51 insertions, 13 deletions
diff --git a/src/libmad/xine_mad_decoder.c b/src/libmad/xine_mad_decoder.c
index bb4ba1f7a..cb8c52831 100644
--- a/src/libmad/xine_mad_decoder.c
+++ b/src/libmad/xine_mad_decoder.c
@@ -22,7 +22,7 @@
#include <stdlib.h>
#include <string.h>
-#include <config.h>
+#include "config.h"
#ifdef HAVE_MAD_H
#include <mad.h>
@@ -48,6 +48,20 @@
#define INPUT_BUF_SIZE 16384
+/* According to Rob Leslie (libmad author) :
+ * The absolute theoretical maximum frame size is 2881 bytes: MPEG 2.5 Layer II,
+ * 8000 Hz @ 160 kbps, with a padding slot. (Such a frame is unlikely, but it was
+ * a useful exercise to compute all possible frame sizes.) Add to this an 8 byte
+ * MAD_BUFFER_GUARD, and the minimum buffer size you should be streaming to
+ * libmad in the general case is 2889 bytes.
+
+ * Theoretical frame sizes for Layer III range from 24 to 1441 bytes, but there
+ * is a "soft" limit imposed by the standard of 960 bytes. Nonetheless MAD can
+ * decode frames of any size as long as they fit entirely in the buffer you pass,
+ * not including the MAD_BUFFER_GUARD bytes.
+ */
+#define MAD_MIN_SIZE 2889
+
typedef struct {
audio_decoder_class_t decoder_class;
} mad_class_t;
@@ -101,7 +115,7 @@ static void mad_reset (audio_decoder_t *this_gen) {
static void mad_discontinuity (audio_decoder_t *this_gen) {
mad_decoder_t *this = (mad_decoder_t *) this_gen;
-
+
this->pts = 0;
}
@@ -141,16 +155,17 @@ static int head_check(mad_decoder_t *this) {
static void mad_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
mad_decoder_t *this = (mad_decoder_t *) this_gen;
+ int bytes_in_buffer_at_pts;
+
+ lprintf ("decode data, size: %d, decoder_flags: %d\n", buf->size, buf->decoder_flags);
- lprintf ("decode data, decoder_flags: 0x%08X\n", buf->decoder_flags);
-
if (buf->size>(INPUT_BUF_SIZE-this->bytes_in_buffer)) {
xprintf (this->xstream->xine, XINE_VERBOSITY_DEBUG,
"libmad: ALERT input buffer too small (%d bytes, %d avail)!\n",
buf->size, INPUT_BUF_SIZE-this->bytes_in_buffer);
buf->size = INPUT_BUF_SIZE-this->bytes_in_buffer;
}
-
+
if ((buf->decoder_flags & BUF_FLAG_HEADER) == 0) {
/* reset decoder on leaving preview mode */
@@ -162,6 +177,8 @@ static void mad_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
this->preview_mode = 1;
}
+ bytes_in_buffer_at_pts = this->bytes_in_buffer;
+
xine_fast_memcpy (&this->buffer[this->bytes_in_buffer],
buf->content, buf->size);
this->bytes_in_buffer += buf->size;
@@ -173,6 +190,9 @@ static void mad_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
mad_stream_buffer (&this->stream, this->buffer,
this->bytes_in_buffer);
+ if (this->bytes_in_buffer < MAD_MIN_SIZE)
+ return;
+
if (!this->needs_more_data) {
this->pts = buf->pts;
if (buf->decoder_flags & BUF_FLAG_AUDIO_PADDING) {
@@ -206,6 +226,7 @@ static void mad_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
return;
default:
+ lprintf ("error 0x%04X, mad_stream_buffer %d bytes\n", this->stream.error, this->bytes_in_buffer);
mad_stream_buffer (&this->stream, this->buffer,
this->bytes_in_buffer);
}
@@ -266,13 +287,14 @@ static void mad_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
mad_synth_frame (&this->synth, &this->frame);
if ( (buf->decoder_flags & BUF_FLAG_PREVIEW) == 0 ) {
-
+
unsigned int nchannels, nsamples;
mad_fixed_t const *left_ch, *right_ch;
struct mad_pcm *pcm = &this->synth.pcm;
audio_buffer_t *audio_buffer;
uint16_t *output;
-
+ int bitrate;
+ int pts_offset;
audio_buffer = this->xstream->audio_out->get_buffer (this->xstream->audio_out);
output = audio_buffer->mem;
@@ -281,7 +303,7 @@ static void mad_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
nsamples = pcm->length;
left_ch = pcm->samples[0];
right_ch = pcm->samples[1];
-
+
/* padding */
if (this->start_padding || this->end_padding) {
/* check padding validity */
@@ -298,7 +320,7 @@ static void mad_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
}
audio_buffer->num_frames = nsamples;
audio_buffer->vpts = this->pts;
-
+
while (nsamples--) {
/* output sample(s) in 16-bit signed little-endian PCM */
@@ -309,8 +331,24 @@ static void mad_decode_data (audio_decoder_t *this_gen, buf_element_t *buf) {
}
+ audio_buffer->num_frames = pcm->length;
+
+ /* pts computing */
+ if (this->frame.header.bitrate > 0) {
+ bitrate = this->frame.header.bitrate;
+ } else {
+ bitrate = _x_stream_info_get(this->xstream, XINE_STREAM_INFO_AUDIO_BITRATE);
+ lprintf("offset %d bps\n", bitrate);
+ }
+ audio_buffer->vpts = buf->pts;
+ if (audio_buffer->vpts && (bitrate > 0)) {
+ pts_offset = (bytes_in_buffer_at_pts * 8 * 90) / (bitrate / 1000);
+ lprintf("pts: %"PRId64", offset: %d pts, %d bytes\n", buf->pts, pts_offset, bytes_in_buffer_at_pts);
+ if (audio_buffer->vpts < pts_offset)
+ pts_offset = audio_buffer->vpts;
+ audio_buffer->vpts -= pts_offset;
+ }
- lprintf ("audio_out->put_buffer, samples=%d, pts=%"PRId64"\n", audio_buffer->num_frames, audio_buffer->vpts);
this->xstream->audio_out->put_buffer (this->xstream->audio_out, audio_buffer, this->xstream);
this->pts = buf->pts;
@@ -351,7 +389,7 @@ static audio_decoder_t *open_plugin (audio_decoder_class_t *class_gen, xine_stre
mad_decoder_t *this ;
- this = (mad_decoder_t *) xine_xmalloc (sizeof (mad_decoder_t));
+ this = (mad_decoder_t *) calloc(1, sizeof(mad_decoder_t));
this->audio_decoder.decode_data = mad_decode_data;
this->audio_decoder.reset = mad_reset;
@@ -395,7 +433,7 @@ static void *init_plugin (xine_t *xine, void *data) {
mad_class_t *this;
- this = (mad_class_t *) xine_xmalloc (sizeof (mad_class_t));
+ this = (mad_class_t *) calloc(1, sizeof(mad_class_t));
this->decoder_class.open_plugin = open_plugin;
this->decoder_class.get_identifier = get_identifier;
@@ -411,7 +449,7 @@ static uint32_t audio_types[] = {
static const decoder_info_t dec_info_audio = {
audio_types, /* supported types */
- 7 /* priority */
+ 8 /* priority */
};
const plugin_info_t xine_plugin_info[] EXPORTED = {
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-28 09:34:34 +0000