shithub: aacdec

Info  •  Files  •  Log

Seeking support for MP4 files in faad. (awy)

--- a/frontend/main.c

+++ b/frontend/main.c

@@ -432,6 +432,7 @@

     faad_fprintf(stdout, " -w    Write output to stdio instead of a file.\n");

     faad_fprintf(stdout, " -g    Disable gapless decoding.\n");

     faad_fprintf(stdout, " -q    Quiet - suppresses status messages.\n");

+    faad_fprintf(stdout, " -j X  Jump - start output X seconds into track (MP4 files only).\n");

     faad_fprintf(stdout, "Example:\n");

     faad_fprintf(stdout, "       %s infile.aac\n", progName);

     faad_fprintf(stdout, "       %s infile.mp4\n", progName);

@@ -803,7 +804,7 @@

 static int decodeMP4file(char *mp4file, char *sndfile, char *adts_fn, int to_stdout,

                   int outputFormat, int fileType, int downMatrix, int noGapless,

-                  int infoOnly, int adts_out, float *song_length)

+                  int infoOnly, int adts_out, float *song_length, float seek_to)

 {

     int track;

     unsigned long samplerate;

@@ -811,7 +812,7 @@

     void *sample_buffer;

     mp4ff_t *infile;

-    long sampleId, numSamples;

+    long sampleId, numSamples, startSampleId;

     audio_file *aufile;

@@ -971,7 +972,14 @@

     numSamples = mp4ff_num_samples(infile, track);

-    for (sampleId = 0; sampleId < numSamples; sampleId++)

+    startSampleId = 0;

+    if (seek_to > 0.1) {

+    	int32_t sample = mp4ff_find_sample(infile, track, (int64_t)(seek_to * timescale), NULL);

+    	if (sample > 0 && sample < numSamples)

+			startSampleId = sample;

+    }

+

+    for (sampleId = startSampleId; sampleId < numSamples; sampleId++)

     {

         int rc;

         long dur;

@@ -1130,6 +1138,7 @@

     char *aacFileName = NULL;

     char *audioFileName = NULL;

     char *adtsFileName = NULL;

+    float seekTo = 0;

     unsigned char header[8];

     float length = 0;

     FILE *hMP4File;

@@ -1162,11 +1171,12 @@

             { "info",       0, 0, 'i' },

             { "stdio",      0, 0, 'w' },

             { "stdio",      0, 0, 'g' },

+            { "seek",       1, 0, 'j' },

             { "help",       0, 0, 'h' },

             { 0, 0, 0, 0 }

         };

-        c = getopt_long(argc, argv, "o:a:s:f:b:l:wgdhitq",

+        c = getopt_long(argc, argv, "o:a:s:f:b:l:j:wgdhitq",

             long_options, &option_index);

         if (c == -1)

@@ -1257,6 +1267,12 @@

                 }

             }

             break;

+        case 'j':

+            if (optarg)

+            {

+            	seekTo = atof(optarg);

+            }

+            break;

         case 't':

             old_format = 1;

             break;

@@ -1381,10 +1397,14 @@

     if (header[4] == 'f' && header[5] == 't' && header[6] == 'y' && header[7] == 'p')

         mp4file = 1;

+    if (!mp4file && seekTo != 0) {

+    	faad_fprintf(stderr, "Warning: can only seek in MP4 files");

+    }

+

     if (mp4file)

     {

         result = decodeMP4file(aacFileName, audioFileName, adtsFileName, writeToStdio,

-            outputFormat, format, downMatrix, noGapless, infoOnly, adts_out, &length);

+            outputFormat, format, downMatrix, noGapless, infoOnly, adts_out, &length, seekTo);

     } else {

 	if (readFromStdin == 1) {