[SCM] libav/experimental: initial commit for Sierra VMD file demuxer
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 15:38:48 UTC 2013
The following commit has been merged in the experimental branch:
commit a7eb3c8dd158daaf134e438663b6e05cc327438b
Author: Mike Melanson <mike at multimedia.cx>
Date: Fri Jan 2 04:47:02 2004 +0000
initial commit for Sierra VMD file demuxer
Originally committed as revision 2653 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 0984c72..7c46573 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -15,7 +15,8 @@ PPOBJS=
OBJS+=mpeg.o mpegts.o mpegtsenc.o ffm.o crc.o img.o raw.o rm.o \
avienc.o avidec.o wav.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
+ nut.o wc3movie.o mp3.o westwood.o segafilm.o idcin.o flic.o \
+ sierravmd.o
ifeq ($(CONFIG_RISKY),yes)
OBJS+= asf.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 9446c0c..156f978 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -70,6 +70,7 @@ void av_register_all(void)
film_init();
idcin_init();
flic_init();
+ vmd_init();
#if defined(AMR_NB) || defined(AMR_NB_FIXED) || defined(AMR_WB)
amr_init();
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 1641aa2..64bea9c 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -480,6 +480,9 @@ int idcin_init(void);
/* flic.c */
int flic_init(void);
+/* sierravmd.c */
+int vmd_init(void);
+
#include "rtp.h"
#include "rtsp.h"
diff --git a/libavformat/sierravmd.c b/libavformat/sierravmd.c
new file mode 100644
index 0000000..d0525b9
--- /dev/null
+++ b/libavformat/sierravmd.c
@@ -0,0 +1,263 @@
+/*
+ * Sierra VMD Format Demuxer
+ * Copyright (c) 2004 The ffmpeg Project
+ *
+ * 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
+ */
+
+/**
+ * @file sierravmd.c
+ * Sierra VMD file demuxer
+ * by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
+ */
+
+#include "avformat.h"
+
+#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
+#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
+ (((uint8_t*)(x))[2] << 16) | \
+ (((uint8_t*)(x))[1] << 8) | \
+ ((uint8_t*)(x))[0])
+
+#define VMD_HEADER_SIZE 0x0330
+#define BYTES_PER_FRAME_RECORD 16
+
+typedef struct {
+ int stream_index;
+ offset_t frame_offset;
+ unsigned int frame_size;
+ int64_t pts;
+ int keyframe;
+ unsigned char frame_record[BYTES_PER_FRAME_RECORD];
+} vmd_frame_t;
+
+typedef struct VmdDemuxContext {
+ int video_stream_index;
+ int audio_stream_index;
+
+ unsigned int audio_type;
+ unsigned int audio_samplerate;
+ unsigned int audio_bits;
+ unsigned int audio_channels;
+
+ unsigned int frame_count;
+ vmd_frame_t *frame_table;
+ unsigned int current_frame;
+
+ unsigned char vmd_header[VMD_HEADER_SIZE];
+} VmdDemuxContext;
+
+static int vmd_probe(AVProbeData *p)
+{
+ if (p->buf_size < 2)
+ return 0;
+
+ /* check if the first 2 bytes of the file contain the appropriate size
+ * of a VMD header chunk */
+ if (LE_16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
+ return 0;
+
+ /* only return half certainty since this check is a bit sketchy */
+ return AVPROBE_SCORE_MAX / 2;
+}
+
+static int vmd_read_header(AVFormatContext *s,
+ AVFormatParameters *ap)
+{
+ VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
+ ByteIOContext *pb = &s->pb;
+ AVStream *st;
+ unsigned int toc_offset;
+ unsigned char *raw_frame_table;
+ int raw_frame_table_size;
+ unsigned char *current_frame_record;
+ offset_t current_offset;
+ int i;
+ int sample_rate;
+ unsigned int total_frames;
+int video_frame_count = 0;
+
+ /* fetch the main header, including the 2 header length bytes */
+ url_fseek(pb, 0, SEEK_SET);
+ if (get_buffer(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
+ return -EIO;
+
+ /* start up the decoders */
+ st = av_new_stream(s, 0);
+ if (!st)
+ return AVERROR_NOMEM;
+ vmd->video_stream_index = st->index;
+ st->codec.codec_type = CODEC_TYPE_VIDEO;
+ st->codec.codec_id = CODEC_ID_VMDVIDEO;
+ st->codec.codec_tag = 0; /* no fourcc */
+ st->codec.width = LE_16(&vmd->vmd_header[12]);
+ st->codec.height = LE_16(&vmd->vmd_header[14]);
+ st->codec.extradata_size = VMD_HEADER_SIZE;
+ st->codec.extradata = av_malloc(VMD_HEADER_SIZE);
+ memcpy(st->codec.extradata, vmd->vmd_header, VMD_HEADER_SIZE);
+
+ /* if sample rate is 0, assume no audio */
+ sample_rate = LE_16(&vmd->vmd_header[804]);
+ if (sample_rate) {
+ st = av_new_stream(s, 0);
+ if (!st)
+ return AVERROR_NOMEM;
+ vmd->audio_stream_index = st->index;
+ st->codec.codec_type = CODEC_TYPE_AUDIO;
+ st->codec.codec_id = CODEC_ID_VMDAUDIO;
+ st->codec.codec_tag = 0; /* no codec tag */
+ st->codec.channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
+ st->codec.sample_rate = sample_rate;
+ st->codec.bit_rate = st->codec.sample_rate *
+ st->codec.bits_per_sample * st->codec.channels;
+ st->codec.block_align = LE_16(&vmd->vmd_header[806]);
+ if (st->codec.block_align & 0x8000) {
+ st->codec.bits_per_sample = 16;
+ st->codec.block_align = -(st->codec.block_align - 0x10000);
+ } else
+ st->codec.bits_per_sample = 8;
+ }
+
+ /* skip over the offset table and load the table of contents; don't
+ * care about the offset table since demuxer will calculate those
+ * independently */
+ toc_offset = LE_32(&vmd->vmd_header[812]);
+ vmd->frame_count = LE_16(&vmd->vmd_header[6]);
+ url_fseek(pb, toc_offset + vmd->frame_count * 6, SEEK_SET);
+
+ /* each on-disk VMD frame has an audio part and a video part; demuxer
+ * accounts them separately */
+ vmd->frame_count *= 2;
+ raw_frame_table = NULL;
+ vmd->frame_table = NULL;
+ raw_frame_table_size = vmd->frame_count * BYTES_PER_FRAME_RECORD;
+ raw_frame_table = av_malloc(raw_frame_table_size);
+ vmd->frame_table = av_malloc(vmd->frame_count * sizeof(vmd_frame_t));
+ if (!raw_frame_table || !vmd->frame_table) {
+ av_free(raw_frame_table);
+ av_free(vmd->frame_table);
+ return AVERROR_NOMEM;
+ }
+ if (get_buffer(pb, raw_frame_table, raw_frame_table_size) !=
+ raw_frame_table_size) {
+ av_free(raw_frame_table);
+ av_free(vmd->frame_table);
+ return -EIO;
+ }
+
+ current_offset = LE_32(&vmd->vmd_header[20]);
+ current_frame_record = raw_frame_table;
+ total_frames = vmd->frame_count;
+ i = 0;
+ while (total_frames--) {
+
+ /* if the frame size is 0, do not count the frame and bring the
+ * total frame count down */
+ vmd->frame_table[i].frame_size = LE_32(¤t_frame_record[2]);
+
+ /* this logic is present so that 0-length audio chunks are not
+ * accounted */
+ if (!vmd->frame_table[i].frame_size) {
+ vmd->frame_count--; /* one less frame to count */
+ current_frame_record += BYTES_PER_FRAME_RECORD;
+ continue;
+ }
+
+ if (current_frame_record[0] == 0x02)
+ vmd->frame_table[i].stream_index = vmd->video_stream_index;
+ else
+ vmd->frame_table[i].stream_index = vmd->audio_stream_index;
+ vmd->frame_table[i].frame_offset = current_offset;
+ current_offset += vmd->frame_table[i].frame_size;
+ memcpy(vmd->frame_table[i].frame_record, current_frame_record,
+ BYTES_PER_FRAME_RECORD);
+
+if (current_frame_record[0] == 0x02) {
+ /* assume 15 fps for now */
+ vmd->frame_table[i].pts = video_frame_count++;
+ vmd->frame_table[i].pts *= 90000;
+ vmd->frame_table[i].pts /= 15;
+}
+
+ current_frame_record += BYTES_PER_FRAME_RECORD;
+ i++;
+ }
+
+ av_free(raw_frame_table);
+
+ /* set the pts reference at 1 pts = 1/90000 sec */
+ s->pts_num = 1;
+ s->pts_den = 90000;
+
+ vmd->current_frame = 0;
+
+ return 0;
+}
+
+static int vmd_read_packet(AVFormatContext *s,
+ AVPacket *pkt)
+{
+ VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
+ ByteIOContext *pb = &s->pb;
+ int ret = 0;
+ vmd_frame_t *frame;
+
+ if (vmd->current_frame >= vmd->frame_count)
+ return -EIO;
+
+ frame = &vmd->frame_table[vmd->current_frame];
+ /* position the stream (will probably be there already) */
+ url_fseek(pb, frame->frame_offset, SEEK_SET);
+
+ if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
+ return AVERROR_NOMEM;
+ memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
+ ret = get_buffer(pb, pkt->data + BYTES_PER_FRAME_RECORD,
+ frame->frame_size);
+
+ if (ret != frame->frame_size)
+ ret = -EIO;
+ pkt->stream_index = frame->stream_index;
+ pkt->pts = frame->pts;
+
+ vmd->current_frame++;
+
+ return ret;
+}
+
+static int vmd_read_close(AVFormatContext *s)
+{
+ VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
+
+ av_free(vmd->frame_table);
+
+ return 0;
+}
+
+static AVInputFormat vmd_iformat = {
+ "vmd",
+ "Sierra VMD format",
+ sizeof(VmdDemuxContext),
+ vmd_probe,
+ vmd_read_header,
+ vmd_read_packet,
+ vmd_read_close,
+};
+
+int vmd_init(void)
+{
+ av_register_input_format(&vmd_iformat);
+ return 0;
+}
--
Libav/FFmpeg packaging
More information about the pkg-multimedia-commits
mailing list