[FFmpeg-cvslog] r18766 - in trunk/libavformat: Makefile allformats.c tmv.c
stefano
subversion
Thu May 7 00:01:54 CEST 2009
Author: stefano
Date: Thu May 7 00:01:54 2009
New Revision: 18766
Log:
Add 8088flex TMV file demuxer.
Patch by Daniel Verkamp daniel|at|drv|nu.
Added:
trunk/libavformat/tmv.c
Modified:
trunk/libavformat/Makefile
trunk/libavformat/allformats.c
Modified: trunk/libavformat/Makefile
==============================================================================
--- trunk/libavformat/Makefile Wed May 6 23:57:20 2009 (r18765)
+++ trunk/libavformat/Makefile Thu May 7 00:01:54 2009 (r18766)
@@ -210,6 +210,7 @@ OBJS-$(CONFIG_TG2_MUXER)
OBJS-$(CONFIG_TGP_MUXER) += movenc.o riff.o isom.o avc.o
OBJS-$(CONFIG_THP_DEMUXER) += thp.o
OBJS-$(CONFIG_TIERTEXSEQ_DEMUXER) += tiertexseq.o
+OBJS-$(CONFIG_TMV_DEMUXER) += tmv.o
OBJS-$(CONFIG_TRUEHD_DEMUXER) += raw.o id3v2.o
OBJS-$(CONFIG_TRUEHD_MUXER) += raw.o
OBJS-$(CONFIG_TTA_DEMUXER) += tta.o
Modified: trunk/libavformat/allformats.c
==============================================================================
--- trunk/libavformat/allformats.c Wed May 6 23:57:20 2009 (r18765)
+++ trunk/libavformat/allformats.c Thu May 7 00:01:54 2009 (r18766)
@@ -182,6 +182,7 @@ void av_register_all(void)
REGISTER_MUXER (TGP, tgp);
REGISTER_DEMUXER (THP, thp);
REGISTER_DEMUXER (TIERTEXSEQ, tiertexseq);
+ REGISTER_DEMUXER (TMV, tmv);
REGISTER_MUXDEMUX (TRUEHD, truehd);
REGISTER_DEMUXER (TTA, tta);
REGISTER_DEMUXER (TXD, txd);
Added: trunk/libavformat/tmv.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ trunk/libavformat/tmv.c Thu May 7 00:01:54 2009 (r18766)
@@ -0,0 +1,156 @@
+/*
+ * 8088flex TMV file demuxer
+ * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
+ *
+ * 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
+ */
+
+/**
+ * 8088flex TMV file demuxer
+ * @file libavformat/tmv.c
+ * @author Daniel Verkamp
+ * @sa http://www.oldskool.org/pc/8088_Corruption
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "avformat.h"
+
+enum {
+ TMV_PADDING = 0x01,
+ TMV_STEREO = 0x02,
+};
+
+#define TMV_TAG MKTAG('T', 'M', 'A', 'V')
+
+typedef struct TMVContext {
+ unsigned audio_chunk_size;
+ unsigned video_chunk_size;
+ unsigned padding;
+ unsigned stream_index;
+} TMVContext;
+
+static int tmv_probe(AVProbeData *p)
+{
+ if (AV_RL32(p->buf) == TMV_TAG)
+ return AVPROBE_SCORE_MAX;
+ return 0;
+}
+
+static int tmv_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+ TMVContext *tmv = s->priv_data;
+ ByteIOContext *pb = s->pb;
+ AVStream *vst, *ast;
+ AVRational fps;
+ unsigned comp_method, char_cols, char_rows, features;
+
+ if (get_le32(pb) != TMV_TAG)
+ return -1;
+
+ if (!(vst = av_new_stream(s, 0)))
+ return AVERROR(ENOMEM);
+
+ if (!(ast = av_new_stream(s, 0)))
+ return AVERROR(ENOMEM);
+
+ ast->codec->sample_rate = get_le16(pb);
+ tmv->audio_chunk_size = get_le16(pb);
+ if (!tmv->audio_chunk_size) {
+ av_log(s, AV_LOG_ERROR, "invalid audio chunk size\n");
+ return -1;
+ }
+
+ comp_method = get_byte(pb);
+ if (comp_method) {
+ av_log(s, AV_LOG_ERROR, "unsupported compression method %d\n",
+ comp_method);
+ return -1;
+ }
+
+ char_cols = get_byte(pb);
+ char_rows = get_byte(pb);
+ tmv->video_chunk_size = char_cols * char_rows * 2;
+
+ features = get_byte(pb);
+ if (features & ~(TMV_PADDING | TMV_STEREO)) {
+ av_log(s, AV_LOG_ERROR, "unsupported features 0x%02x\n",
+ features & ~(TMV_PADDING | TMV_STEREO));
+ return -1;
+ }
+
+ ast->codec->codec_type = CODEC_TYPE_AUDIO;
+ ast->codec->codec_id = CODEC_ID_PCM_U8;
+ ast->codec->sample_fmt = SAMPLE_FMT_U8;
+ ast->codec->channels = features & TMV_STEREO ? 2 : 1;
+ ast->codec->bits_per_coded_sample = 8;
+ ast->codec->bit_rate = ast->codec->sample_rate *
+ ast->codec->bits_per_coded_sample;
+ av_set_pts_info(ast, 32, 1, ast->codec->sample_rate);
+
+ fps.num = ast->codec->sample_rate * ast->codec->channels;
+ fps.den = tmv->audio_chunk_size;
+ av_reduce(&fps.num, &fps.den, fps.num, fps.den, 0xFFFFFFFFLL);
+
+ vst->codec->codec_type = CODEC_TYPE_VIDEO;
+ vst->codec->codec_id = CODEC_ID_TMV;
+ vst->codec->pix_fmt = PIX_FMT_PAL8;
+ vst->codec->width = char_cols * 8;
+ vst->codec->height = char_rows * 8;
+ av_set_pts_info(vst, 32, fps.den, fps.num);
+
+ if (features & TMV_PADDING)
+ tmv->padding =
+ ((tmv->video_chunk_size + tmv->audio_chunk_size + 511) & ~511) -
+ (tmv->video_chunk_size + tmv->audio_chunk_size);
+
+ vst->codec->bit_rate = ((tmv->video_chunk_size + tmv->padding) *
+ fps.num * 8) / fps.den;
+
+ return 0;
+}
+
+static int tmv_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ TMVContext *tmv = s->priv_data;
+ ByteIOContext *pb = s->pb;
+ int ret, pkt_size = tmv->stream_index ?
+ tmv->audio_chunk_size : tmv->video_chunk_size;
+
+ if (url_feof(pb))
+ return AVERROR_EOF;
+
+ ret = av_get_packet(pb, pkt, pkt_size);
+
+ if (tmv->stream_index)
+ url_fskip(pb, tmv->padding);
+
+ pkt->stream_index = tmv->stream_index;
+ tmv->stream_index ^= 1;
+ pkt->flags |= PKT_FLAG_KEY;
+
+ return ret;
+}
+
+AVInputFormat tmv_demuxer = {
+ "tmv",
+ NULL_IF_CONFIG_SMALL("8088flex TMV"),
+ sizeof(TMVContext),
+ tmv_probe,
+ tmv_read_header,
+ tmv_read_packet,
+ .flags = AVFMT_GENERIC_INDEX,
+};
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