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Diffstat (limited to 'ffmpeg1/libavformat/mmf.c')
-rw-r--r--ffmpeg1/libavformat/mmf.c319
1 files changed, 319 insertions, 0 deletions
diff --git a/ffmpeg1/libavformat/mmf.c b/ffmpeg1/libavformat/mmf.c
new file mode 100644
index 0000000..d074d7c
--- /dev/null
+++ b/ffmpeg1/libavformat/mmf.c
@@ -0,0 +1,319 @@
+/*
+ * Yamaha SMAF format
+ * Copyright (c) 2005 Vidar Madsen
+ *
+ * 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 "libavutil/channel_layout.h"
+#include "avformat.h"
+#include "internal.h"
+#include "avio_internal.h"
+#include "pcm.h"
+#include "rawenc.h"
+#include "riff.h"
+
+typedef struct {
+ int64_t atrpos, atsqpos, awapos;
+ int64_t data_end;
+ int stereo;
+} MMFContext;
+
+static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };
+
+static int mmf_rate(int code)
+{
+ if((code < 0) || (code > 4))
+ return -1;
+ return mmf_rates[code];
+}
+
+#if CONFIG_MMF_MUXER
+static int mmf_rate_code(int rate)
+{
+ int i;
+ for(i = 0; i < 5; i++)
+ if(mmf_rates[i] == rate)
+ return i;
+ return -1;
+}
+
+/* Copy of end_tag() from avienc.c, but for big-endian chunk size */
+static void end_tag_be(AVIOContext *pb, int64_t start)
+{
+ int64_t pos;
+
+ pos = avio_tell(pb);
+ avio_seek(pb, start - 4, SEEK_SET);
+ avio_wb32(pb, (uint32_t)(pos - start));
+ avio_seek(pb, pos, SEEK_SET);
+}
+
+static int mmf_write_header(AVFormatContext *s)
+{
+ MMFContext *mmf = s->priv_data;
+ AVIOContext *pb = s->pb;
+ int64_t pos;
+ int rate;
+ const char *version = s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT ?
+ "VN:Lavf," :
+ "VN:"LIBAVFORMAT_IDENT",";
+
+ rate = mmf_rate_code(s->streams[0]->codec->sample_rate);
+ if(rate < 0) {
+ av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d, supported are 4000, 8000, 11025, 22050 and 44100\n", s->streams[0]->codec->sample_rate);
+ return AVERROR(EINVAL);
+ }
+
+ mmf->stereo = s->streams[0]->codec->channels > 1;
+ if (mmf->stereo &&
+ s->streams[0]->codec->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
+ av_log(s, AV_LOG_ERROR, "Yamaha SMAF stereo is experimental, "
+ "add '-strict %d' if you want to use it.\n",
+ FF_COMPLIANCE_EXPERIMENTAL);
+ return AVERROR(EINVAL);
+ }
+
+ ffio_wfourcc(pb, "MMMD");
+ avio_wb32(pb, 0);
+ pos = ff_start_tag(pb, "CNTI");
+ avio_w8(pb, 0); /* class */
+ avio_w8(pb, 1); /* type */
+ avio_w8(pb, 1); /* code type */
+ avio_w8(pb, 0); /* status */
+ avio_w8(pb, 0); /* counts */
+ end_tag_be(pb, pos);
+ pos = ff_start_tag(pb, "OPDA");
+ avio_write(pb, version, strlen(version)); /* metadata ("ST:songtitle,VN:version,...") */
+ end_tag_be(pb, pos);
+
+ avio_write(pb, "ATR\x00", 4);
+ avio_wb32(pb, 0);
+ mmf->atrpos = avio_tell(pb);
+ avio_w8(pb, 0); /* format type */
+ avio_w8(pb, 0); /* sequence type */
+ avio_w8(pb, (mmf->stereo << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */
+ avio_w8(pb, 0); /* wave base bit */
+ avio_w8(pb, 2); /* time base d */
+ avio_w8(pb, 2); /* time base g */
+
+ ffio_wfourcc(pb, "Atsq");
+ avio_wb32(pb, 16);
+ mmf->atsqpos = avio_tell(pb);
+ /* Will be filled on close */
+ avio_write(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
+
+ mmf->awapos = ff_start_tag(pb, "Awa\x01");
+
+ avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
+
+ avio_flush(pb);
+
+ return 0;
+}
+
+/* Write a variable-length symbol */
+static void put_varlength(AVIOContext *pb, int val)
+{
+ if(val < 128)
+ avio_w8(pb, val);
+ else {
+ val -= 128;
+ avio_w8(pb, 0x80 | val >> 7);
+ avio_w8(pb, 0x7f & val);
+ }
+}
+
+static int mmf_write_trailer(AVFormatContext *s)
+{
+ AVIOContext *pb = s->pb;
+ MMFContext *mmf = s->priv_data;
+ int64_t pos, size;
+ int gatetime;
+
+ if (s->pb->seekable) {
+ /* Fill in length fields */
+ end_tag_be(pb, mmf->awapos);
+ end_tag_be(pb, mmf->atrpos);
+ end_tag_be(pb, 8);
+
+ pos = avio_tell(pb);
+ size = pos - mmf->awapos;
+
+ /* Fill Atsq chunk */
+ avio_seek(pb, mmf->atsqpos, SEEK_SET);
+
+ /* "play wav" */
+ avio_w8(pb, 0); /* start time */
+ avio_w8(pb, (mmf->stereo << 6) | 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 */
+ avio_write(pb, "\xff\x00", 2); /* nop */
+
+ /* "end of sequence" */
+ avio_write(pb, "\x00\x00\x00\x00", 4);
+
+ avio_seek(pb, pos, SEEK_SET);
+
+ avio_flush(pb);
+ }
+ return 0;
+}
+#endif /* CONFIG_MMF_MUXER */
+
+static int mmf_probe(AVProbeData *p)
+{
+ /* check file header */
+ 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)
+{
+ MMFContext *mmf = s->priv_data;
+ unsigned int tag;
+ AVIOContext *pb = s->pb;
+ AVStream *st;
+ int64_t size;
+ int rate, params;
+
+ tag = avio_rl32(pb);
+ if (tag != MKTAG('M', 'M', 'M', 'D'))
+ return AVERROR_INVALIDDATA;
+ avio_skip(pb, 4); /* file_size */
+
+ /* Skip some unused chunks that may or may not be present */
+ for(;; avio_skip(pb, size)) {
+ tag = avio_rl32(pb);
+ size = avio_rb32(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('M', 'T', 'R', 0)) {
+ av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n");
+ return AVERROR_PATCHWELCOME;
+ }
+ if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
+ av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ avio_r8(pb); /* format type */
+ avio_r8(pb); /* sequence type */
+ params = avio_r8(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 AVERROR_INVALIDDATA;
+ }
+ avio_r8(pb); /* wave base bit */
+ avio_r8(pb); /* time base d */
+ avio_r8(pb); /* time base g */
+
+ /* Skip some unused chunks that may or may not be present */
+ for(;; avio_skip(pb, size)) {
+ tag = avio_rl32(pb);
+ size = avio_rb32(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 AVERROR_INVALIDDATA;
+ }
+ mmf->data_end = avio_tell(pb) + size;
+
+ st = avformat_new_stream(s, NULL);
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codec->codec_id = AV_CODEC_ID_ADPCM_YAMAHA;
+ st->codec->sample_rate = rate;
+ st->codec->channels = (params >> 7) + 1;
+ st->codec->channel_layout = params >> 7 ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
+ st->codec->bits_per_coded_sample = 4;
+ st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample;
+
+ avpriv_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;
+ int64_t left, size;
+ int ret;
+
+ left = mmf->data_end - avio_tell(s->pb);
+ size = FFMIN(left, MAX_SIZE);
+ if (url_feof(s->pb) || size <= 0)
+ return AVERROR_EOF;
+
+ ret = av_get_packet(s->pb, pkt, size);
+ if (ret < 0)
+ return ret;
+
+ pkt->stream_index = 0;
+
+ return ret;
+}
+
+#if CONFIG_MMF_DEMUXER
+AVInputFormat ff_mmf_demuxer = {
+ .name = "mmf",
+ .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
+ .priv_data_size = sizeof(MMFContext),
+ .read_probe = mmf_probe,
+ .read_header = mmf_read_header,
+ .read_packet = mmf_read_packet,
+ .flags = AVFMT_GENERIC_INDEX,
+};
+#endif
+#if CONFIG_MMF_MUXER
+AVOutputFormat ff_mmf_muxer = {
+ .name = "mmf",
+ .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
+ .mime_type = "application/vnd.smaf",
+ .extensions = "mmf",
+ .priv_data_size = sizeof(MMFContext),
+ .audio_codec = AV_CODEC_ID_ADPCM_YAMAHA,
+ .video_codec = AV_CODEC_ID_NONE,
+ .write_header = mmf_write_header,
+ .write_packet = ff_raw_write_packet,
+ .write_trailer = mmf_write_trailer,
+};
+#endif
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