BFI demuxer

Patch by Sisir Koppaka (sisir.koppaka at G.M!A.I!L.com)

Originally committed as revision 12808 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 167 insertions, 0 deletions

diff --git a/libavformat/bfi.c b/libavformat/bfi.c
new file mode 100644
index 0000000000..67cd1fe329
--- /dev/null
+++ b/libavformat/bfi.c
@@ -0,0 +1,167 @@
+/*
+ * Brute Force & Ignorance (BFI) demuxer
+ * Copyright (c) 2008 Sisir Koppaka
+ *
+ * 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
+ */
+
+/**
+ * @file bfi.c
+ * @brief Brute Force & Ignorance (.bfi) file demuxer
+ * @author Sisir Koppaka ( sisir.koppaka at gmail dot com )
+ * @sa http://wiki.multimedia.cx/index.php?title=BFI
+ */
+
+#include "avformat.h"
+
+typedef struct BFIContext {
+    int nframes;
+    int audio_frame;
+    int video_frame;
+    int video_size;
+    int avflag;
+} BFIContext;
+
+static int bfi_probe(AVProbeData * p)
+{
+    /* Check file header */
+    if (AV_RL32(p->buf) == MKTAG('B', 'F', '&', 'I'))
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+static int bfi_read_header(AVFormatContext * s, AVFormatParameters * ap)
+{
+    BFIContext *bfi = s->priv_data;
+    ByteIOContext *pb = s->pb;
+    AVStream *vstream;
+    AVStream *astream;
+    int fps, chunk_header;
+
+    /* Initialize the video codec... */
+    vstream = av_new_stream(s, 0);
+    if (!vstream)
+        return AVERROR(ENOMEM);
+
+    /* Initialize the audio codec... */
+    astream = av_new_stream(s, 0);
+    if (!astream)
+        return AVERROR(ENOMEM);
+
+    /* Set the total number of frames. */
+    url_fskip(pb, 8);
+    chunk_header           = get_le32(pb);
+    bfi->nframes           = get_le32(pb);
+    get_le32(pb);
+    get_le32(pb);
+    get_le32(pb);
+    fps                    = get_le32(pb);
+    url_fskip(pb, 12);
+    vstream->codec->width  = get_le32(pb);
+    vstream->codec->height = get_le32(pb);
+
+    /*Load the palette to extradata */
+    url_fskip(pb, 8);
+    vstream->codec->extradata      = av_malloc(768);
+    vstream->codec->extradata_size = 768;
+    get_buffer(pb, vstream->codec->extradata,
+               vstream->codec->extradata_size);
+
+    astream->codec->sample_rate = get_le32(pb);
+
+    /* Set up the video codec... */
+    av_set_pts_info(vstream, 32, 1, fps);
+    vstream->codec->codec_type = CODEC_TYPE_VIDEO;
+    vstream->codec->codec_id   = CODEC_ID_BFI;
+    vstream->codec->pix_fmt    = PIX_FMT_PAL8;
+
+    /* Set up the audio codec now... */
+    astream->codec->codec_type      = CODEC_TYPE_AUDIO;
+    astream->codec->codec_id        = CODEC_ID_PCM_U8;
+    astream->codec->channels        = 1;
+    astream->codec->bits_per_sample = 8;
+    astream->codec->bit_rate        =
+        astream->codec->sample_rate * astream->codec->bits_per_sample;
+    url_fseek(pb, chunk_header - 3, SEEK_SET);
+    av_set_pts_info(astream, 64, 1, astream->codec->sample_rate);
+    return 0;
+}
+
+
+static int bfi_read_packet(AVFormatContext * s, AVPacket * pkt)
+{
+    BFIContext *bfi = s->priv_data;
+    ByteIOContext *pb = s->pb;
+    int ret, audio_offset, video_offset, chunk_size, audio_size = 0;
+    if (bfi->nframes == 0 || url_feof(pb)) {
+        return AVERROR(EIO);
+    }
+
+    /* If all previous chunks were completely read, then find a new one... */
+    if (!bfi->avflag) {
+        uint32_t state = 0;
+        while(state != MKTAG('S','A','V','I')){
+            if (url_feof(pb))
+                return AVERROR(EIO);
+            state = 256*state + get_byte(pb);
+        }
+        /* Now that the chunk's location is confirmed, we proceed... */
+        chunk_size      = get_le32(pb);
+        get_le32(pb);
+        audio_offset    = get_le32(pb);
+        get_le32(pb);
+        video_offset    = get_le32(pb);
+        audio_size      = video_offset - audio_offset;
+        bfi->video_size = chunk_size - video_offset;
+
+        //Tossing an audio packet at the audio decoder.
+        ret = av_get_packet(pb, pkt, audio_size);
+        if (ret < 0)
+            return ret;
+
+        pkt->pts          = bfi->audio_frame;
+        bfi->audio_frame += ret;
+    }
+
+    else {
+
+        //Tossing a video packet at the video decoder.
+        ret = av_get_packet(pb, pkt, bfi->video_size);
+        if (ret < 0)
+            return ret;
+
+        pkt->pts          = bfi->video_frame;
+        bfi->video_frame += ret / bfi->video_size;
+
+        /* One less frame to read. A cursory decrement. */
+        bfi->nframes--;
+    }
+
+    bfi->avflag       = !bfi->avflag;
+    pkt->stream_index = bfi->avflag;
+    return ret;
+}
+
+AVInputFormat bfi_demuxer = {
+    "bfi",
+    "Brute Force & Ignorance",
+    sizeof(BFIContext),
+    bfi_probe,
+    bfi_read_header,
+    bfi_read_packet,
+};