Yamaha SMAF file format support patch by (Vidar Madsen: vidarino, gmail com)

Originally committed as revision 4444 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/Makefile

@@ -13,7 +13,7 @@ PPOBJS=
 
 # mux and demuxes
 OBJS+=mpeg.o mpegts.o mpegtsenc.o ffm.o crc.o img.o img2.o raw.o rm.o \
-      avienc.o avidec.o wav.o swf.o au.o gif.o mov.o mpjpeg.o dv.o \
+      avienc.o avidec.o wav.o mmf.o swf.o au.o gif.o mov.o mpjpeg.o dv.o \
       yuv4mpeg.o 4xm.o flvenc.o flvdec.o movenc.o psxstr.o idroq.o ipmovie.o \
       nut.o wc3movie.o mp3.o westwood.o segafilm.o idcin.o flic.o \
       sierravmd.o matroska.o sol.o electronicarts.o nsvdec.o asf.o asf-enc.o \

libavformat/allformats.c

@@ -51,6 +51,7 @@ void av_register_all(void)
 #endif //CONFIG_ENCODERS
     avidec_init();
     ff_wav_init();
+    ff_mmf_init();
     swf_init();
     au_init();
 #ifdef CONFIG_ENCODERS

libavformat/avformat.h

@@ -462,6 +462,9 @@ int amr_init(void);
 /* wav.c */
 int ff_wav_init(void);
 
+/* mmf.c */
+int ff_mmf_init(void);
+
 /* raw.c */
 int pcm_read_seek(AVFormatContext *s, 
                   int stream_index, int64_t timestamp, int flags);

libavformat/mmf.c

+/* 
+ * Yamaha SMAF format
+ * Copyright (c) 2005 Vidar Madsen
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include "avformat.h"
+#include "avi.h"
+
+#ifdef CONFIG_ENCODERS
+typedef struct {
+    offset_t atrpos, atsqpos, awapos;
+    offset_t data_size;
+} MMFContext;
+
+static int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };
+
+static int mmf_rate_code(int rate)
+{
+    int i;
+    for(i = 0; i < 5; i++)
+        if(mmf_rates[i] == rate)
+            return i;
+    return -1;
+}
+
+static int mmf_rate(int code)
+{
+    if((code < 0) || (code > 4))
+        return -1;
+    return mmf_rates[code];
+}
+
+/* Copy of end_tag() from avienc.c, but for big-endian chunk size */
+static void end_tag_be(ByteIOContext *pb, offset_t start)
+{
+    offset_t pos;
+
+    pos = url_ftell(pb);
+    url_fseek(pb, start - 4, SEEK_SET);
+    put_be32(pb, (uint32_t)(pos - start));
+    url_fseek(pb, pos, SEEK_SET);
+}
+
+static int mmf_write_header(AVFormatContext *s)
+{
+    MMFContext *mmf = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    offset_t pos;
+    int rate;
+
+    rate = mmf_rate_code(s->streams[0]->codec.sample_rate);
+    if(rate < 0) {
+        av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d\n", s->streams[0]->codec.sample_rate);
+        return -1;
+    }
+    
+    put_tag(pb, "MMMD");
+    put_be32(pb, 0);
+    pos = start_tag(pb, "CNTI");
+    put_byte(pb, 0); /* class */
+    put_byte(pb, 0); /* type */
+    put_byte(pb, 0); /* code type */
+    put_byte(pb, 0); /* status */
+    put_byte(pb, 0); /* counts */
+    put_tag(pb, "VN:libavcodec,"); /* metadata ("ST:songtitle,VN:version,...") */
+    end_tag_be(pb, pos);
+
+    put_buffer(pb, "ATR\x00", 4);
+    put_be32(pb, 0);
+    mmf->atrpos = url_ftell(pb);
+    put_byte(pb, 0); /* format type */
+    put_byte(pb, 0); /* sequence type */
+    put_byte(pb, (0 << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */
+    put_byte(pb, 0); /* wave base bit */
+    put_byte(pb, 2); /* time base d */
+    put_byte(pb, 2); /* time base g */
+
+    put_tag(pb, "Atsq");
+    put_be32(pb, 16);
+    mmf->atsqpos = url_ftell(pb);
+    /* Will be filled on close */
+    put_buffer(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
+
+    mmf->awapos = start_tag(pb, "Awa\x01");
+
+    av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec.sample_rate);
+
+    put_flush_packet(pb);
+
+    return 0;
+}
+
+static int mmf_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    ByteIOContext *pb = &s->pb;
+    put_buffer(pb, pkt->data, pkt->size);
+    return 0;
+}
+
+/* Write a variable-length symbol */
+static void put_varlength(ByteIOContext *pb, int val)
+{
+    if(val < 128)
+        put_byte(pb, val);
+    else {
+        val -= 128;
+        put_byte(pb, 0x80 | val >> 7);
+        put_byte(pb, 0x7f & val);
+    }
+}
+
+static int mmf_write_trailer(AVFormatContext *s)
+{
+    ByteIOContext *pb = &s->pb;
+    MMFContext *mmf = s->priv_data;
+    offset_t pos, size;
+    int gatetime;
+
+    if (!url_is_streamed(&s->pb)) {
+        /* Fill in length fields */
+        end_tag_be(pb, mmf->awapos);
+        end_tag_be(pb, mmf->atrpos);
+        end_tag_be(pb, 8);
+
+        pos = url_ftell(pb);
+        size = pos - mmf->awapos;
+
+        /* Fill Atsq chunk */
+        url_fseek(pb, mmf->atsqpos, SEEK_SET);
+
+        /* "play wav" */
+        put_byte(pb, 0); /* start time */
+        put_byte(pb, 1); /* (channel << 6) | wavenum */
+        gatetime = size * 500 / s->streams[0]->codec.sample_rate;
+        put_varlength(pb, gatetime); /* duration */
+
+        /* "nop" */
+        put_varlength(pb, gatetime); /* start time */
+        put_buffer(pb, "\xff\x00", 2); /* nop */
+
+        /* "end of sequence" */
+        put_buffer(pb, "\x00\x00\x00\x00", 4);
+
+        url_fseek(pb, pos, SEEK_SET);
+
+        put_flush_packet(pb);
+    }
+    return 0;
+}
+#endif //CONFIG_ENCODERS
+
+static int mmf_probe(AVProbeData *p)
+{
+    /* check file header */
+    if (p->buf_size <= 32)
+        return 0;
+    if (p->buf[0] == 'M' && p->buf[1] == 'M' &&
+        p->buf[2] == 'M' && p->buf[3] == 'D' &&
+        p->buf[8] == 'C' && p->buf[9] == 'N' &&
+        p->buf[10] == 'T' && p->buf[11] == 'I')
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+/* mmf input */
+static int mmf_read_header(AVFormatContext *s,
+                           AVFormatParameters *ap)
+{
+    MMFContext *mmf = s->priv_data;
+    unsigned int tag;
+    ByteIOContext *pb = &s->pb;
+    AVStream *st;
+    offset_t file_size, size;
+    int rate, params;
+
+    tag = get_le32(pb);
+    if (tag != MKTAG('M', 'M', 'M', 'D'))
+        return -1;
+    file_size = get_be32(pb);
+
+    /* Skip some unused chunks that may or may not be present */
+    for(;; url_fseek(pb, size, SEEK_CUR)) {
+        tag = get_le32(pb);
+        size = get_be32(pb);
+        if(tag == MKTAG('C','N','T','I')) continue;
+        if(tag == MKTAG('O','P','D','A')) continue;
+        break;
+    }
+
+    /* Tag = "ATRx", where "x" = track number */
+    if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
+        av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
+        return -1;
+    }
+
+    get_byte(pb); /* format type */
+    get_byte(pb); /* sequence type */
+    params = get_byte(pb); /* (channel << 7) | (format << 4) | rate */
+    rate = mmf_rate(params & 0x0f);
+    if(rate  < 0) {
+        av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
+        return -1;
+    }
+    get_byte(pb); /* wave base bit */
+    get_byte(pb); /* time base d */
+    get_byte(pb); /* time base g */
+
+    /* Skip some unused chunks that may or may not be present */
+    for(;; url_fseek(pb, size, SEEK_CUR)) {
+        tag = get_le32(pb);
+        size = get_be32(pb);
+        if(tag == MKTAG('A','t','s','q')) continue;
+        if(tag == MKTAG('A','s','p','I')) continue;
+        break;
+    }
+
+    /* Make sure it's followed by an Awa chunk, aka wave data */
+    if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) {
+        av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag);
+        return -1;
+    }
+    mmf->data_size = size;
+
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+
+    st->codec.codec_type = CODEC_TYPE_AUDIO;
+    st->codec.codec_id = CODEC_ID_ADPCM_YAMAHA;
+    st->codec.sample_rate = rate;
+    st->codec.channels = 1;
+    st->codec.bits_per_sample = 4;
+    st->codec.bit_rate = st->codec.sample_rate * st->codec.bits_per_sample;
+
+    av_set_pts_info(st, 64, 1, st->codec.sample_rate);
+
+    return 0;
+}
+
+#define MAX_SIZE 4096
+
+static int mmf_read_packet(AVFormatContext *s,
+                           AVPacket *pkt)
+{
+    MMFContext *mmf = s->priv_data;
+    AVStream *st;
+    int ret, size;
+
+    if (url_feof(&s->pb))
+        return AVERROR_IO;
+    st = s->streams[0];
+
+    size = MAX_SIZE;
+    if(size > mmf->data_size)
+        size = mmf->data_size;
+
+    if(!size)
+        return AVERROR_IO;
+    
+    if (av_new_packet(pkt, size))
+        return AVERROR_IO;
+    pkt->stream_index = 0;
+
+    ret = get_buffer(&s->pb, pkt->data, pkt->size);
+    if (ret < 0)
+        av_free_packet(pkt);
+
+    mmf->data_size -= ret;
+
+    pkt->size = ret;
+    return ret;
+}
+
+static int mmf_read_close(AVFormatContext *s)
+{
+    return 0;
+}
+
+static int mmf_read_seek(AVFormatContext *s, 
+                         int stream_index, int64_t timestamp, int flags)
+{
+    return pcm_read_seek(s, stream_index, timestamp, flags);
+}
+
+
+static AVInputFormat mmf_iformat = {
+    "mmf",
+    "mmf format",
+    sizeof(MMFContext),
+    mmf_probe,
+    mmf_read_header,
+    mmf_read_packet,
+    mmf_read_close,
+    mmf_read_seek,
+};
+
+#ifdef CONFIG_ENCODERS
+static AVOutputFormat mmf_oformat = {
+    "mmf",
+    "mmf format",
+    "application/vnd.smaf",
+    "mmf",
+    sizeof(MMFContext),
+    CODEC_ID_ADPCM_YAMAHA,
+    CODEC_ID_NONE,
+    mmf_write_header,
+    mmf_write_packet,
+    mmf_write_trailer,
+};
+#endif //CONFIG_ENCODERS
+
+int ff_mmf_init(void)
+{
+    av_register_input_format(&mmf_iformat);
+#ifdef CONFIG_ENCODERS
+    av_register_output_format(&mmf_oformat);
+#endif //CONFIG_ENCODERS
+    return 0;
+}
+