first pass at PSX STR demuxer; does not yet interact correctly with MDEC

video decoder

Originally committed as revision 2190 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 352 insertions, 0 deletions

diff --git a/libavformat/psxstr.c b/libavformat/psxstr.c
new file mode 100644
index 0000000000..3b1933c04e
--- /dev/null
+++ b/libavformat/psxstr.c
@@ -0,0 +1,352 @@
+/*
+ * Sony Playstation (PSX) STR File Demuxer
+ * Copyright (c) 2003 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 psxstr.c
+ * PSX STR file demuxer
+ * by Mike Melanson (melanson@pcisys.net)
+ * This module handles streams that have been ripped from Sony Playstation
+ * CD games. This demuxer can handle either raw STR files (which are just
+ * concatenations of raw compact disc sectors) or STR files with 0x2C-byte
+ * RIFF headers, followed by CD sectors.
+ */
+
+#include "avformat.h"
+
+//#define PRINTSTUFF
+
+#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 FOURCC_TAG( ch0, ch1, ch2, ch3 ) \
+        ( (long)(unsigned char)(ch0) | \
+        ( (long)(unsigned char)(ch1) << 8 ) | \
+        ( (long)(unsigned char)(ch2) << 16 ) | \
+        ( (long)(unsigned char)(ch3) << 24 ) )
+
+#define RIFF_TAG FOURCC_TAG('R', 'I', 'F', 'F')
+#define CDXA_TAG FOURCC_TAG('C', 'D', 'X', 'A')
+
+#define RAW_CD_SECTOR_SIZE 2352
+#define RAW_CD_SECTOR_DATA_SIZE 2304
+#define VIDEO_DATA_CHUNK_SIZE 0x7E0
+#define VIDEO_DATA_HEADER_SIZE 0x38
+#define RIFF_HEADER_SIZE 0x2C
+
+#define CDXA_TYPE_MASK     0x0E
+#define CDXA_TYPE_DATA     0x08
+#define CDXA_TYPE_AUDIO    0x04
+#define CDXA_TYPE_VIDEO    0x02
+
+#define STR_MAGIC (0x80010160)
+
+typedef struct StrChannel {
+
+    int type;
+#define STR_AUDIO 0
+#define STR_VIDEO 1
+
+    /* video parameters */
+    int width;
+    int height;
+    int video_stream_index;
+
+    /* audio parameters */
+    int sample_rate;
+    int channels;
+    int bits;
+    int audio_stream_index;
+} StrChannel;
+
+typedef struct StrDemuxContext {
+
+    /* a STR file can contain up to 32 channels of data */
+    StrChannel channels[32];
+
+    /* only decode the first audio and video channels encountered */
+    int video_channel;
+    int audio_channel;
+
+    int64_t pts;
+
+    unsigned char *video_chunk;
+} StrDemuxContext;
+
+static int str_probe(AVProbeData *p)
+{
+    int start;
+
+    /* need at least 0x38 bytes to validate */
+    if (p->buf_size < 0x38)
+        return 0;
+
+    if ((LE_32(&p->buf[0]) == RIFF_TAG) &&
+        (LE_32(&p->buf[8]) == CDXA_TAG)) {
+
+        /* RIFF header seen; skip 0x2C bytes */
+        start = RIFF_HEADER_SIZE;
+    } else
+        start = 0;
+
+    /* look for CD sync header (00, 0xFF x 10, 00) */
+    if ((p->buf[start + 0] != 0x00) || (p->buf[start + 1] != 0xFF) ||
+        (p->buf[start + 2] != 0xFF) || (p->buf[start + 3] != 0xFF) ||
+        (p->buf[start + 4] != 0xFF) || (p->buf[start + 5] != 0xFF) ||
+        (p->buf[start + 6] != 0xFF) || (p->buf[start + 7] != 0xFF) ||
+        (p->buf[start + 8] != 0xFF) || (p->buf[start + 9] != 0xFF) ||
+        (p->buf[start + 10] != 0xFF) || (p->buf[start + 11] != 0x00))
+        return 0;
+
+    /* MPEG files (like those ripped from VCDs) can also look like this;
+     * only return half certainty */
+    return 50;
+}
+
+static int str_read_header(AVFormatContext *s,
+                           AVFormatParameters *ap)
+{
+    ByteIOContext *pb = &s->pb;
+    StrDemuxContext *str = (StrDemuxContext *)s->priv_data;
+    AVStream *st;
+    unsigned char sector[RAW_CD_SECTOR_SIZE];
+    int start;
+    int i;
+    int channel;
+
+    /* initialize context members */
+    str->pts = 0;
+    str->audio_channel = -1;  /* assume to audio or video */
+    str->video_channel = -1;
+    str->video_chunk = NULL;
+
+    /* set the pts reference (1 pts = 1/90000) */
+    s->pts_num = 1;
+    s->pts_den = 90000;
+
+    /* skip over any RIFF header */
+    if (get_buffer(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)
+        return AVERROR_IO;
+    if (LE_32(&sector[0]) == RIFF_TAG)
+        start = RIFF_HEADER_SIZE;
+    else
+        start = 0;
+
+    url_fseek(pb, start, SEEK_SET);
+
+    /* check through the first 32 sectors for individual channels */
+    for (i = 0; i < 32; i++) {
+        if (get_buffer(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
+            return AVERROR_IO;
+
+        channel = sector[0x11];
+        if (channel >= 32)
+            return AVERROR_INVALIDDATA;
+
+        switch (sector[0x12] & CDXA_TYPE_MASK) {
+
+        case CDXA_TYPE_DATA:
+        case CDXA_TYPE_VIDEO:
+            /* check if this channel gets to be the dominant video channel */
+            if (str->video_channel == -1) {
+                /* qualify the magic number */
+                if (LE_32(&sector[0x18]) != STR_MAGIC)
+                    break;
+                str->video_channel = channel;
+                str->channels[channel].type = STR_VIDEO;
+                str->channels[channel].width = LE_16(&sector[0x28]);
+                str->channels[channel].height = LE_16(&sector[0x2A]);
+
+                /* allocate a new AVStream */
+                st = av_new_stream(s, 0);
+                if (!st)
+                    return AVERROR_NOMEM;
+
+                str->channels[channel].video_stream_index = st->index;
+
+                st->codec.codec_type = CODEC_TYPE_VIDEO;
+                st->codec.codec_id = CODEC_ID_MDEC; 
+                st->codec.codec_tag = 0;  /* no fourcc */
+                st->codec.width = str->channels[channel].width;
+                st->codec.height = str->channels[channel].height;
+            }
+            break;
+
+        case CDXA_TYPE_AUDIO:
+            /* check if this channel gets to be the dominant audio channel */
+            if (str->audio_channel == -1) {
+                str->audio_channel = channel;
+                str->channels[channel].type = STR_AUDIO;
+                str->channels[channel].channels = 
+                    (sector[0x13] & 0x01) ? 2 : 1;
+                str->channels[channel].sample_rate = 
+                    (sector[0x13] & 0x04) ? 18900 : 37800;
+                str->channels[channel].bits = 
+                    (sector[0x13] & 0x10) ? 8 : 4;
+            }
+            break;
+
+        default:
+            /* ignore */
+            break;
+        }
+    }
+
+if (str->video_channel != -1)
+  printf (" video channel = %d, %d x %d\n", str->video_channel,
+    str->channels[str->video_channel].width,
+    str->channels[str->video_channel].height);
+if (str->audio_channel != -1)
+  printf (" audio channel = %d, %d Hz, %d channels, %d bits/sample\n", 
+    str->video_channel,
+    str->channels[str->video_channel].sample_rate,
+    str->channels[str->video_channel].channels,
+    str->channels[str->video_channel].bits);
+
+    /* back to the start */
+    url_fseek(pb, start, SEEK_SET);
+
+    return 0;
+}
+
+static int str_read_packet(AVFormatContext *s,
+                           AVPacket *pkt)
+{
+    ByteIOContext *pb = &s->pb;
+    StrDemuxContext *str = (StrDemuxContext *)s->priv_data;
+    unsigned char sector[RAW_CD_SECTOR_SIZE];
+    int channel;
+    int packet_read = 0;
+    int video_sector_count = 0;
+    int current_video_sector = 0;
+    int video_frame_size = 0;
+    int video_frame_index = 0;
+    int bytes_to_copy;
+    int ret = 0;
+
+    while (!packet_read) {
+
+        if (get_buffer(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
+            return -EIO;
+
+        channel = sector[0x11];
+        if (channel >= 32)
+            return AVERROR_INVALIDDATA;
+
+        switch (sector[0x12] & CDXA_TYPE_MASK) {
+
+        case CDXA_TYPE_DATA:
+        case CDXA_TYPE_VIDEO:
+            /* check if this the video channel we care about */
+            if (channel == str->video_channel) {
+
+                /* if this is the first sector of the frame, allocate a pkt */
+                if (current_video_sector == 0) {
+                    video_frame_size = LE_32(&sector[0x24]);
+                    video_sector_count = LE_16(&sector[0x1E]);
+                    if (av_new_packet(pkt, video_frame_size))
+                        return -EIO;
+
+                    pkt->stream_index = 
+                        str->channels[channel].video_stream_index;
+                    pkt->pts = str->pts;
+
+                    /* if there is no audio, adjust the pts after every video
+                     * frame; assume 15 fps */
+                   if (str->audio_channel != -1)
+                       str->pts += (90000 / 15);
+                }
+
+                /* load all the constituent chunks in the video packet */
+                if (video_frame_size - video_frame_index < VIDEO_DATA_CHUNK_SIZE)
+                    bytes_to_copy = video_frame_size - video_frame_index;
+                else
+                    bytes_to_copy = VIDEO_DATA_CHUNK_SIZE;
+                if (video_frame_index < video_frame_size)
+                    memcpy(&pkt->data[video_frame_index],
+                        &sector[VIDEO_DATA_HEADER_SIZE], bytes_to_copy);
+
+#ifdef PRINTSTUFF
+printf ("  chunk %d/%d (bytes %d/%d), first 6 bytes = %02X %02X %02X %02X %02X %02X\n",
+  current_video_sector, video_sector_count,
+  video_frame_index, video_frame_size,
+  pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 0],
+  pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 1],
+  pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 2],
+  pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 3],
+  pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 4],
+  pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 5]);
+#endif
+
+                video_frame_index += bytes_to_copy;
+                /* must keep reading sectors until all current video sectors
+                 * are consumed */
+                current_video_sector++;
+                if (current_video_sector >= video_sector_count)
+                    packet_read = 1;
+
+            }
+            break;
+
+        case CDXA_TYPE_AUDIO:
+#ifdef PRINTSTUFF
+printf (" dropping audio sector\n");
+#endif
+        break;
+        default:
+            /* drop the sector and move on */
+#ifdef PRINTSTUFF
+printf (" dropping other sector\n");
+#endif
+            break;
+        }
+
+        if (url_feof(pb))
+            return -EIO;
+    }
+
+    return ret;
+}
+
+static int str_read_close(AVFormatContext *s)
+{
+    StrDemuxContext *str = (StrDemuxContext *)s->priv_data;
+
+    av_free(str->video_chunk);
+
+    return 0;
+}
+
+static AVInputFormat str_iformat = {
+    "psxstr",
+    "Sony Playstation STR format",
+    sizeof(StrDemuxContext),
+    str_probe,
+    str_read_header,
+    str_read_packet,
+    str_read_close,
+};
+
+int str_init(void)
+{
+    av_register_input_format(&str_iformat);
+    return 0;
+}