shithub: alienpatch

ref: 2876acc163c86ba7cd1603e9b4ea3e2d559a8ae2
dir: /opus-tools-seek/

diff 1d5e00558c79cf9a4266124d393cfbc879df7475 uncommitted
--- a/src/opusdec.c
+++ b/src/opusdec.c
@@ -493,7 +493,7 @@
 
 opus_int64 audio_write(float *pcm, int channels, int frame_size, FILE *fout,
  SpeexResamplerState *resampler, float *clipmem, shapestate *shapemem,
- int file, int rate, opus_int64 link_read, opus_int64 link_out, int fp)
+ int file, int rate, opus_int64 link_read, opus_int64 link_out, int fp, opus_int64 *seek)
 {
    opus_int64 sampout=0;
    opus_int64 maxout;
@@ -521,12 +521,20 @@
         pcm, &in_len, buf, &out_len);
        pcm += channels*(in_len);
        frame_size -= in_len;
+       ret = *seek<in_len?*seek:in_len;
      } else {
        output=pcm;
        out_len=frame_size<maxout?(unsigned)frame_size:(unsigned)maxout;
        frame_size=0;
+       ret = *seek<out_len?*seek:out_len;
      }
 
+     if (*seek > 0)
+     {
+       *seek -= ret;
+       goto next;
+     }
+
      if (!file||!fp)
      {
         /*Convert to short and save to output file*/
@@ -570,6 +578,7 @@
 #endif
          ret=fwrite(fp?(char *)output:(char *)out,
           (fp?sizeof(float):sizeof(short))*channels, out_len, fout);
+next:
        sampout+=ret;
        maxout-=ret;
      }
@@ -656,7 +665,7 @@
 static void drain_resampler(FILE *fout, int file_output,
  SpeexResamplerState *resampler, int channels, int rate,
  opus_int64 link_read, opus_int64 link_out, float *clipmem,
- shapestate *shapemem, opus_int64 *audio_size, int fp)
+ shapestate *shapemem, opus_int64 *audio_size, int fp, opus_int64 *seek)
 {
    float *zeros;
    int drain;
@@ -667,7 +676,7 @@
       opus_int64 outsamp;
       int tmp=MINI(drain, 100);
       outsamp=audio_write(zeros, channels, tmp, fout, resampler, clipmem,
-       shapemem, file_output, rate, link_read, link_out, fp);
+       shapemem, file_output, rate, link_read, link_out, fp, seek);
       link_out+=outsamp;
       (*audio_size)+=(fp?sizeof(float):sizeof(short))*outsamp*channels;
       drain-=tmp;
@@ -714,6 +723,7 @@
       {0, 0, 0, 0}
    };
    opus_int64 audio_size=0;
+   opus_int64 seek=-1;
    opus_int64 last_coded_seconds=-1;
    float loss_percent=-1;
    float manual_gain=0;
@@ -749,7 +759,7 @@
    /*Process options*/
    while (1)
    {
-      c = getopt_long(argc_utf8, argv_utf8, "hV",
+      c = getopt_long(argc_utf8, argv_utf8, "hVs:",
                        long_options, &option_index);
       if (c==-1)
          break;
@@ -801,6 +811,9 @@
       case 'h':
          usage();
          goto done;
+      case 's':
+         seek = atoi(optarg);
+         break;
       case 'V':
          version();
          goto done;
@@ -1020,6 +1033,11 @@
       op_set_decode_callback(st, (op_decode_cb_func)decode_cb, &cb_ctx);
    }
 
+   if (seek != -1)
+   {
+      seek *= rate;
+   }
+
    /*Main decoding loop*/
    while (1)
    {
@@ -1063,7 +1081,7 @@
          {
             drain_resampler(fout, file_output, resampler, channels, rate,
              link_read, link_out, clipmem, dither?&shapemem:NULL, &audio_size,
-             fp);
+             fp, &seek);
             /*Neither speex_resampler_reset_mem() nor
               speex_resampler_skip_zeros() clear the number of fractional
               samples properly, so we just destroy it. It will get re-created
@@ -1171,7 +1189,7 @@
       }
       outsamp=audio_write(permuted_output?permuted_output:output, channels,
        nb_read, fout, resampler, clipmem, dither?&shapemem:0, file_output,
-       rate, link_read, link_out, fp);
+       rate, link_read, link_out, fp, &seek);
       link_out+=outsamp;
       audio_size+=(fp?sizeof(float):sizeof(short))*outsamp*channels;
    }
@@ -1179,7 +1197,7 @@
    if (resampler!=NULL)
    {
       drain_resampler(fout, file_output, resampler, channels, rate,
-       link_read, link_out, clipmem, dither?&shapemem:NULL, &audio_size, fp);
+       link_read, link_out, clipmem, dither?&shapemem:NULL, &audio_size, fp, &seek);
       speex_resampler_destroy(resampler);
    }