Changeset 107

Timestamp:

11/09/06 13:44:00 (17 years ago)

Author:

r2d

Message:

• gapless playback should now be supported (not verified)

Location:

libmpcdec/branches/zorg

Files:

• include/mpcdec/mpcdec.h (modified) (1 diff)
• src/decoder.h (modified) (1 diff)
• src/mpc_decoder.c (modified) (7 diffs)
• src/mpc_demux.c (modified) (3 diffs)

libmpcdec/branches/zorg/include/mpcdec/mpcdec.h

@@ -58 +58 @@
 typedef struct mpc_frame_info_t {
         mpc_uint32_t samples;   // number of samples in the frame
-        mpc_uint32_t sample_freq;       // frame sample frequency
-        mpc_uint8_t channels;   // number of channels
         MPC_SAMPLE_FORMAT * buffer;     // frame samples buffer (size = samples * channels * sizeof(MPC_SAMPLE_FORMAT)
 } mpc_frame_info;

libmpcdec/branches/zorg/src/decoder.h

@@ -64 +64 @@
     /// @name internal state variables
     //@{
-    mpc_uint32_t  SampleRate;                 // Sample frequency
-    mpc_uint32_t  StreamVersion;              // version of bitstream
-    mpc_uint32_t  Max_Band;
-    mpc_uint32_t  MS_used;                    // MS-coding used ?
-        mpc_uint32_t  TrueGaplessPresent;
-        mpc_uint32_t  OverallFrames;              // number of frames in the stream, 0 = unknow
-        mpc_uint32_t  LastFrameSamples;           // number of samples in the last frame
+        mpc_uint32_t  stream_version; ///< Streamversion of stream
+        mpc_uint32_t  max_band; ///< Maximum band-index used in stream (0...31)
+        mpc_uint32_t  ms; ///< Mid/side stereo (0: off, 1: on)
+        mpc_uint32_t  is_true_gapless; ///< True gapless? (0: no, 1: yes)
+        mpc_uint32_t  frames; ///< Number of frames in stream
+        mpc_uint32_t  last_frame_samples; ///< Number of valid samples within last frame
+        mpc_uint32_t channels; ///< Number of channels in stream
 
         mpc_uint32_t  samples_to_skip;
-        mpc_uint32_t  DecodedFrames;
+        mpc_uint32_t  decoded_frames;
 
     // randomizer state variables

libmpcdec/branches/zorg/src/mpc_decoder.c

@@ -89 +89 @@
 void mpc_decoder_set_streaminfo(mpc_decoder *d, mpc_streaminfo *si)
 {
-        d->StreamVersion      = si->stream_version;
-        d->MS_used            = si->ms;
-        d->Max_Band           = si->max_band;
-        d->OverallFrames      = si->frames;
-        d->TrueGaplessPresent = si->is_true_gapless;
-        d->SampleRate         = si->sample_freq;
+        d->stream_version     = si->stream_version;
+        d->ms                 = si->ms;
+        d->max_band           = si->max_band;
+        d->frames             = si->frames;
+        d->is_true_gapless    = si->is_true_gapless;
+        d->channels           = si->channels;
+        d->last_frame_samples = si->last_frame_samples;
 }
 
@@ -118 +119 @@
                                                           mpc_frame_info * i)
 {
-        // FIXME : sauter décodage si d->samples_to_skip > MPC_FRAME_LENGTH pour sv7
-        switch (d->StreamVersion) {
-                case 0x07:
-                case 0x17:
-                case 0x08:
-                        i->channels = 2;
-                        i->sample_freq = d->SampleRate;
-                        i->samples = MPC_FRAME_LENGTH;
-                        mpc_decoder_read_bitstream_sv7(d, r);
-                        break;
+        d->decoded_frames++;
+
+        if (d->decoded_frames > d->frames && !d->is_true_gapless) {
+                mpc_decoder_reset_y(d);
+        } else {
+                mpc_decoder_read_bitstream_sv7(d, r);
+                mpc_decoder_requantisierung(d);
         }
-
-        // synthesize signal
-        mpc_decoder_requantisierung(d);
         mpc_decoder_synthese_filter_float(d, i->buffer);
 
-        d->DecodedFrames++;
-
-//     // cut off first MPC_DECODER_SYNTH_DELAY zero-samples
-//      if (d->DecodedFrames == d->OverallFrames  && d->StreamVersion >= 6) {
-//         // reconstruct exact filelength
-//              mpc_int32_t  mod_block   = mpc_bits_read(r,  11);
-//              mpc_int32_t  FilterDecay;
-//
-//              if (mod_block == 0) {
-//             // Encoder bugfix
-//                      mod_block = 1152;
-//              }
-//              FilterDecay = (mod_block + MPC_DECODER_SYNTH_DELAY) % MPC_FRAME_LENGTH;
-//
-//         // additional FilterDecay samples are needed for decay of synthesis filter
-//              if (MPC_DECODER_SYNTH_DELAY + mod_block >= MPC_FRAME_LENGTH) {
-//                      if (!d->TrueGaplessPresent) {
-//                              mpc_decoder_reset_y(d);
-//                      } else {
-//                              mpc_bits_read(r, 20);
-//                              mpc_decoder_read_bitstream_sv7(d, FALSE);
-//                              mpc_decoder_requantisierung(d, d->Max_Band);
-//                      }
-//
-//                      mpc_decoder_synthese_filter_float(d, buffer + 2304);
-//
-//                      i->samples = MPC_FRAME_LENGTH + FilterDecay;
-//              }
-//              else {                              // there are only FilterDecay samples needed for this frame
-//                      i->samples = FilterDecay;
-//              }
-//      }
+    // cut off first MPC_DECODER_SYNTH_DELAY zero-samples
+    // reconstruct exact filelength
+        if (d->decoded_frames == d->frames && (d->stream_version & 15) == 7) {
+                d->last_frame_samples = mpc_bits_read(r, 11);
+                if (d->last_frame_samples == 0) {
+            // Encoder bugfix
+                        d->last_frame_samples = MPC_FRAME_LENGTH;
+                }
+        }
+
+        mpc_int32_t samples_left = d->last_frame_samples + MPC_DECODER_SYNTH_DELAY
+                        + (d->frames - d->decoded_frames) * MPC_FRAME_LENGTH;
+
+        i->samples = samples_left > MPC_FRAME_LENGTH ? MPC_FRAME_LENGTH : samples_left < 0 ? 0 : samples_left;
 
         if (d->samples_to_skip) {
@@ -173 +150 @@
                 } else {
                         i->samples -= d->samples_to_skip;
-                        memmove(i->buffer, i->buffer + d->samples_to_skip * i->channels,
-                                        i->samples * i->channels * sizeof (MPC_SAMPLE_FORMAT));
+                        memmove(i->buffer, i->buffer + d->samples_to_skip * d->channels,
+                                        i->samples * d->channels * sizeof (MPC_SAMPLE_FORMAT));
                         d->samples_to_skip = 0;
                 }
@@ -193 +170 @@
     mpc_int32_t*    L;
     mpc_int32_t*    R;
-        const mpc_int32_t Last_Band = d->Max_Band;
+        const mpc_int32_t Last_Band = d->max_band;
 
 #ifdef MPC_FIXED_POINT
@@ -363 +340 @@
     *ResL = mpc_bits_read(r, 4);
     *ResR = mpc_bits_read(r, 4);
-    if (d->MS_used && !(*ResL==0 && *ResR==0)) {
+        if (d->ms && !(*ResL==0 && *ResR==0)) {
         d->MS_Flag[0] = mpc_bits_read(r, 1);
     }
@@ -369 +346 @@
     // consecutive subbands
     ++ResL; ++ResR; // increase pointers
-    for (n=1; n <= d->Max_Band; ++n, ++ResL, ++ResR)
+        for (n=1; n <= d->max_band; ++n, ++ResL, ++ResR)
     {
                 idx   = mpc_bits_huff_dec(r, mpc_table_HuffHdr);
@@ -377 +354 @@
         *ResR = (idx!=4) ? *(ResR-1) + idx : (int) mpc_bits_read(r, 4);
 
-        if (d->MS_used && !(*ResL==0 && *ResR==0)) {
+                if (d->ms && !(*ResL==0 && *ResR==0)) {
             d->MS_Flag[n] = mpc_bits_read(r, 1);
         }

libmpcdec/branches/zorg/src/mpc_demux.c

@@ -172 +172 @@
 void mpc_demux_decode(mpc_demux * d, mpc_frame_info * i)
 {
-        i->samples = 0;
-        if (d->d->OverallFrames != 0 && d->d->DecodedFrames == d->d->OverallFrames)
-                return;
         if (d->si.stream_version == 8) {
                 mpc_bits_reader r;
-                if (d->block_bits < 8){
+                if (d->block_bits < 8 && (d->d->decoded_frames < d->d->frames || d->d->frames == 0)){
                         mpc_block b;
                         d->bits_reader.count &= -8;
@@ -195 +192 @@
                 d->block_bits -= (d->bits_reader.buff - r.buff) * 8 + r.count - d->bits_reader.count;
         } else {
-                int frame_size;
                 mpc_bits_reader r;
                 mpc_demux_fill(d, MAX_FRAME_SIZE, MPC_BUFFER_FULL | MPC_BUFFER_SWAP);
-                frame_size = mpc_bits_read(&d->bits_reader, 20); // read frame size
+                mpc_bits_read(&d->bits_reader, 20); // read frame size
                 r = d->bits_reader;
                 mpc_decoder_decode_frame(d->d, &d->bits_reader, i);
-                if ((d->bits_reader.buff - r.buff) * 8 + r.count - d->bits_reader.count != frame_size){
-                        frame_size--;
-                        frame_size += 1;
-                }
         }
 }
@@ -215 +207 @@
 //      mpc_uint32_t  FrameBitCnt = 0;
 //
-//      if (d->DecodedFrames >= d->OverallFrames) {
+//      if (d->decoded_frames >= d->OverallFrames) {
 //              return (mpc_uint32_t)(-1);                           // end of file -> abort decoding
 //      }
 //
 //     // add seeking info
-//      if (d->seeking_table_frames < d->DecodedFrames &&
-//                 (d->DecodedFrames & ((1 << d->seeking_pwr) - 1)) == 0) {
-//              d->seeking_table[d->DecodedFrames >> d->seeking_pwr] = mpc_decoder_bits_read(d);
-//              d->seeking_table_frames = d->DecodedFrames;
+//      if (d->seeking_table_frames < d->decoded_frames &&
+//                 (d->decoded_frames & ((1 << d->seeking_pwr) - 1)) == 0) {
+//              d->seeking_table[d->decoded_frames >> d->seeking_pwr] = mpc_decoder_bits_read(d);
+//              d->seeking_table_frames = d->decoded_frames;
 //                 }
 //