Initial caf muxer.

1 files changed, 182 insertions, 0 deletions

diff --git a/libavformat/cafenc.c b/libavformat/cafenc.c
new file mode 100644
index 0000000000..0f33c6b592
--- /dev/null
+++ b/libavformat/cafenc.c
@@ -0,0 +1,182 @@
+/*
+ * Core Audio Format muxer
+ * Copyright (c) 2011 Carl Eugen Hoyos
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avformat.h"
+#include "caf.h"
+#include "riff.h"
+#include "isom.h"
+#include "avio_internal.h"
+
+typedef struct {
+    int64_t data;
+} CAFContext;
+
+static uint32_t codec_flags(enum CodecID codec_id) {
+    switch (codec_id) {
+    case CODEC_ID_PCM_F32BE:
+    case CODEC_ID_PCM_F64BE:
+        return 1; //< kCAFLinearPCMFormatFlagIsFloat
+    case CODEC_ID_PCM_S16LE:
+    case CODEC_ID_PCM_S24LE:
+    case CODEC_ID_PCM_S32LE:
+        return 2; //< kCAFLinearPCMFormatFlagIsLittleEndian
+    case CODEC_ID_PCM_F32LE:
+    case CODEC_ID_PCM_F64LE:
+        return 3; //< kCAFLinearPCMFormatFlagIsFloat | kCAFLinearPCMFormatFlagIsLittleEndian
+    default:
+        return 0;
+    }
+}
+
+static uint32_t samples_per_packet(enum CodecID codec_id) {
+    switch (codec_id) {
+    case CODEC_ID_PCM_S8:
+    case CODEC_ID_PCM_S16LE:
+    case CODEC_ID_PCM_S16BE:
+    case CODEC_ID_PCM_S24LE:
+    case CODEC_ID_PCM_S24BE:
+    case CODEC_ID_PCM_S32LE:
+    case CODEC_ID_PCM_S32BE:
+    case CODEC_ID_PCM_F32LE:
+    case CODEC_ID_PCM_F32BE:
+    case CODEC_ID_PCM_F64LE:
+    case CODEC_ID_PCM_F64BE:
+    case CODEC_ID_PCM_ALAW:
+    case CODEC_ID_PCM_MULAW:
+        return 1;
+    case CODEC_ID_MACE3:
+    case CODEC_ID_MACE6:
+        return 6;
+    case CODEC_ID_ADPCM_IMA_QT:
+        return 64;
+    case CODEC_ID_AMR_NB:
+    case CODEC_ID_GSM:
+    case CODEC_ID_QCELP:
+        return 160;
+    case CODEC_ID_MP1:
+        return 384;
+    case CODEC_ID_MP2:
+    case CODEC_ID_MP3:
+        return 1152;
+    case CODEC_ID_AC3:
+        return 1536;
+    case CODEC_ID_ALAC:
+    case CODEC_ID_QDM2:
+        return 4096;
+    default:
+        return 0;
+    }
+}
+
+static int caf_write_header(AVFormatContext *s)
+{
+    AVIOContext *pb = s->pb;
+    AVCodecContext *enc = s->streams[0]->codec;
+    CAFContext *caf = s->priv_data;
+    unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, enc->codec_id);
+
+    switch (enc->codec_id) {
+    case CODEC_ID_PCM_S8:
+    case CODEC_ID_PCM_S16LE:
+    case CODEC_ID_PCM_S16BE:
+    case CODEC_ID_PCM_S24LE:
+    case CODEC_ID_PCM_S24BE:
+    case CODEC_ID_PCM_S32LE:
+    case CODEC_ID_PCM_S32BE:
+    case CODEC_ID_PCM_F32LE:
+    case CODEC_ID_PCM_F32BE:
+    case CODEC_ID_PCM_F64LE:
+    case CODEC_ID_PCM_F64BE:
+    case CODEC_ID_PCM_ALAW:
+    case CODEC_ID_PCM_MULAW:
+        codec_tag = MKBETAG('l','p','c','m');
+    }
+
+    if (!codec_tag) {
+        av_log(s, AV_LOG_ERROR, "unsupported codec\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (!enc->block_align) {
+        av_log(s, AV_LOG_ERROR, "muxing with unknown or variable packet size not yet supported\n");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    ffio_wfourcc(pb, "caff"); //< mFileType
+    avio_wb16(pb, 1);         //< mFileVersion
+    avio_wb16(pb, 0);         //< mFileFlags
+
+    ffio_wfourcc(pb, "desc");                         //< Audio Description chunk
+    avio_wb64(pb, 32);                                //< mChunkSize
+    avio_wb64(pb, av_dbl2int(enc->sample_rate));      //< mSampleRate
+    avio_wb32(pb, codec_tag);                         //< mFormatID
+    avio_wb32(pb, codec_flags(enc->codec_id));        //< mFormatFlags
+    avio_wb32(pb, enc->block_align);                  //< mBytesPerPacket
+    avio_wb32(pb, samples_per_packet(enc->codec_id)); //< mFramesPerPacket
+    avio_wb32(pb, enc->channels);                     //< mChannelsPerFrame
+    avio_wb32(pb, enc->bits_per_coded_sample);        //< mBitsPerChannel
+
+    ff_mov_write_chan(s, enc->channel_layout, "chan");
+
+    ffio_wfourcc(pb, "data"); //< Audio Data chunk
+    caf->data = avio_tell(pb);
+    avio_wb64(pb, -1);        //< mChunkSize
+    avio_wb32(pb, 0);         //< mEditCount
+
+    avio_flush(pb);
+    return 0;
+}
+
+static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    avio_write(s->pb, pkt->data, pkt->size);
+    return 0;
+}
+
+static int caf_write_trailer(AVFormatContext *s)
+{
+    AVIOContext *pb = s->pb;
+
+    if (pb->seekable) {
+        CAFContext *caf = s->priv_data;
+        int64_t file_size = avio_tell(pb);
+
+        avio_seek(pb, caf->data, SEEK_SET);
+        avio_wb64(pb, file_size - caf->data - 8);
+        avio_seek(pb, file_size, SEEK_SET);
+        avio_flush(pb);
+    }
+    return 0;
+}
+
+AVOutputFormat ff_caf_muxer = {
+    "caf",
+    NULL_IF_CONFIG_SMALL("Apple Core Audio Format"),
+    "audio/x-caf",
+    "caf",
+    sizeof(CAFContext),
+    CODEC_ID_PCM_S16BE,
+    CODEC_ID_NONE,
+    caf_write_header,
+    caf_write_packet,
+    caf_write_trailer,
+    .codec_tag= (const AVCodecTag* const []){ff_codec_caf_tags, 0},
+};