WAV muxer: add RF64 support

1 files changed, 67 insertions, 6 deletions

diff --git a/libavformat/wavenc.c b/libavformat/wavenc.c
index 2e80a75b6e..ba902c9024 100644
--- a/libavformat/wavenc.c
+++ b/libavformat/wavenc.c
@@ -5,6 +5,9 @@
  * Sony Wave64 muxer
  * Copyright (c) 2012 Paul B Mahol
  *
+ * WAV muxer RF64 support
+ * Copyright (c) 2013 Daniel Verkamp <daniel@drv.nu>
+ *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
@@ -36,14 +39,20 @@
 #include "internal.h"
 #include "riff.h"
 
+#define RF64_AUTO   (-1)
+#define RF64_NEVER  0
+#define RF64_ALWAYS 1
+
 typedef struct WAVMuxContext {
     const AVClass *class;
     int64_t data;
     int64_t fact_pos;
+    int64_t ds64;
     int64_t minpts;
     int64_t maxpts;
     int last_duration;
     int write_bext;
+    int rf64;
 } WAVMuxContext;
 
 #if CONFIG_WAV_MUXER
@@ -107,10 +116,24 @@ static int wav_write_header(AVFormatContext *s)
     AVIOContext *pb = s->pb;
     int64_t fmt;
 
+    if (wav->rf64 == RF64_ALWAYS) {
+        ffio_wfourcc(pb, "RF64");
+        avio_wl32(pb, -1); /* RF64 chunk size: use size in ds64 */
+    } else {
     ffio_wfourcc(pb, "RIFF");
     avio_wl32(pb, 0); /* file length */
+    }
+
     ffio_wfourcc(pb, "WAVE");
 
+    if (wav->rf64 != RF64_NEVER) {
+        /* write empty ds64 chunk or JUNK chunk to reserve space for ds64 */
+        ffio_wfourcc(pb, wav->rf64 == RF64_ALWAYS ? "ds64" : "JUNK");
+        avio_wl32(pb, 28); /* chunk size */
+        wav->ds64 = avio_tell(pb);
+        ffio_fill(pb, 0, 28);
+    }
+
     /* format header */
     fmt = ff_start_tag(pb, "fmt ");
     if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) {
@@ -163,31 +186,65 @@ static int wav_write_trailer(AVFormatContext *s)
 {
     AVIOContext *pb  = s->pb;
     WAVMuxContext    *wav = s->priv_data;
-    int64_t file_size;
+    int64_t file_size, data_size;
+    int64_t number_of_samples = 0;
+    int rf64 = 0;
 
     avio_flush(pb);
 
     if (s->pb->seekable) {
-        ff_end_tag(pb, wav->data);
-
         /* update file size */
         file_size = avio_tell(pb);
+        data_size = file_size - wav->data;
+        if (wav->rf64 == RF64_ALWAYS || (wav->rf64 == RF64_AUTO && file_size - 8 > UINT32_MAX)) {
+            rf64 = 1;
+        } else {
         avio_seek(pb, 4, SEEK_SET);
         avio_wl32(pb, (uint32_t)(file_size - 8));
         avio_seek(pb, file_size, SEEK_SET);
 
+                ff_end_tag(pb, wav->data);
         avio_flush(pb);
+        }
 
-        if(s->streams[0]->codec->codec_tag != 0x01) {
-            /* Update num_samps in fact chunk */
-            int number_of_samples;
             number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
                                            s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
                                            s->streams[0]->time_base.den);
+
+        if(s->streams[0]->codec->codec_tag != 0x01) {
+            /* Update num_samps in fact chunk */
             avio_seek(pb, wav->fact_pos, SEEK_SET);
+            if (rf64 || (wav->rf64 == RF64_AUTO && number_of_samples > UINT32_MAX)) {
+                rf64 = 1;
+                avio_wl32(pb, -1);
+            } else {
             avio_wl32(pb, number_of_samples);
             avio_seek(pb, file_size, SEEK_SET);
             avio_flush(pb);
+            }
+        }
+
+        if (rf64) {
+            /* overwrite RIFF with RF64 */
+            avio_seek(pb, 0, SEEK_SET);
+            ffio_wfourcc(pb, "RF64");
+            avio_wl32(pb, -1);
+
+            /* write ds64 chunk (overwrite JUNK if rf64 == RF64_AUTO) */
+            avio_seek(pb, wav->ds64 - 8, SEEK_SET);
+            ffio_wfourcc(pb, "ds64");
+            avio_wl32(pb, 28);                  /* ds64 chunk size */
+            avio_wl64(pb, file_size - 8);       /* RF64 chunk size */
+            avio_wl64(pb, data_size);           /* data chunk size */
+            avio_wl64(pb, number_of_samples);   /* fact chunk number of samples */
+            avio_wl32(pb, 0);                   /* number of table entries for non-'data' chunks */
+
+            /* write -1 in data chunk size */
+            avio_seek(pb, wav->data - 4, SEEK_SET);
+            avio_wl32(pb, -1);
+
+            avio_seek(pb, file_size, SEEK_SET);
+            avio_flush(pb);
         }
     }
     return 0;
@@ -197,6 +254,10 @@ static int wav_write_trailer(AVFormatContext *s)
 #define ENC AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption options[] = {
     { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
+    { "rf64",       "Use RF64 header rather than RIFF for large files.",    OFFSET(rf64), AV_OPT_TYPE_INT,   { .i64 = RF64_NEVER  },-1, 1, ENC, "rf64" },
+    { "auto",       "Write RF64 header if file grows large enough.",        0,            AV_OPT_TYPE_CONST, { .i64 = RF64_AUTO   }, 0, 0, ENC, "rf64" },
+    { "always",     "Always write RF64 header regardless of file size.",    0,            AV_OPT_TYPE_CONST, { .i64 = RF64_ALWAYS }, 0, 0, ENC, "rf64" },
+    { "never",      "Never write RF64 header regardless of file size.",     0,            AV_OPT_TYPE_CONST, { .i64 = RF64_NEVER  }, 0, 0, ENC, "rf64" },
     { NULL },
 };