complete AVS playback system (from Creature Shock computer game),

courtesy of Aurelien Jacobs <aurel at gnuage dot org>

Originally committed as revision 5028 to svn://svn.ffmpeg.org/ffmpeg/trunk

Changelog

@@ -40,6 +40,7 @@ version <next>
 - Zip Blocks Motion Video decoder
 - Improved Theora/VP3 decoder
 - True Audio (TTA) decoder
+- AVS demuxer and video decoder
 
 version 0.4.9-pre1:
 

doc/ffmpeg-doc.texi

@@ -700,6 +700,8 @@ library:
 @item Creative VOC @tab X @tab X @tab Created for the Sound Blaster Pro.
 @item American Laser Games MM  @tab    @tab X
 @tab Multimedia format used in games like Mad Dog McCree
+@item AVS @tab    @tab X
+@tab Multimedia format used by the Creature Shock game.
 @end multitable
 
 @code{X} means that encoding (resp. decoding) is supported.
@@ -792,6 +794,7 @@ following image formats are supported:
 @item CamStudio              @tab     @tab  X @tab fourcc: CSCD
 @item American Laser Games Video  @tab    @tab X @tab Used in games like Mad Dog McCree
 @item ZMBV                   @tab     @tab  X @tab
+@item AVS Video              @tab     @tab  X @tab Video encoding used by the Creature Shock game.
 @end multitable
 
 @code{X} means that encoding (resp. decoding) is supported.

libavcodec/Makefile

@@ -29,6 +29,9 @@ endif
 ifneq ($(CONFIG_ASV1_DECODER)$(CONFIG_ASV1_ENCODER)$(CONFIG_ASV2_DECODER)$(CONFIG_ASV2_ENCODER),)
     OBJS+= asv1.o
 endif
+ifeq ($(CONFIG_AVS_DECODER),yes)
+    OBJS+= avs.o
+endif
 ifeq ($(CONFIG_CINEPAK_DECODER),yes)
     OBJS+= cinepak.o
 endif

libavcodec/allcodecs.c

@@ -511,6 +511,9 @@ void avcodec_register_all(void)
 #ifdef CONFIG_TTA_DECODER
     register_avcodec(&tta_decoder);
 #endif //CONFIG_TTA_DECODER
+#ifdef CONFIG_AVS_DECODER
+    register_avcodec(&avs_decoder);
+#endif //CONFIG_AVS_DECODER
 #ifdef CONFIG_RAWVIDEO_DECODER
     register_avcodec(&rawvideo_decoder);
 #endif //CONFIG_RAWVIDEO_DECODER

libavcodec/avcodec.h

@@ -21,8 +21,8 @@ extern "C" {
 #define AV_STRINGIFY(s)         AV_TOSTRING(s)
 #define AV_TOSTRING(s) #s
 
-#define LIBAVCODEC_VERSION_INT  ((51<<16)+(6<<8)+0)
-#define LIBAVCODEC_VERSION      51.6.0
+#define LIBAVCODEC_VERSION_INT  ((51<<16)+(7<<8)+0)
+#define LIBAVCODEC_VERSION      51.7.0
 #define LIBAVCODEC_BUILD        LIBAVCODEC_VERSION_INT
 
 #define LIBAVCODEC_IDENT        "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
@@ -117,6 +117,7 @@ enum CodecID {
     CODEC_ID_CSCD,
     CODEC_ID_MMVIDEO,
     CODEC_ID_ZMBV,
+    CODEC_ID_AVS,
 
     /* various pcm "codecs" */
     CODEC_ID_PCM_S16LE= 0x10000,
@@ -2233,6 +2234,7 @@ extern AVCodec libgsm_decoder;
 extern AVCodec bmp_decoder;
 extern AVCodec mmvideo_decoder;
 extern AVCodec zmbv_decoder;
+extern AVCodec avs_decoder;
 
 /* pcm codecs */
 #define PCM_CODEC(id, name) \

libavcodec/avs.c

+/*
+ * AVS video decoder.
+ * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "avcodec.h"
+#include "bitstream.h"
+
+
+typedef struct {
+    AVFrame picture;
+} avs_context_t;
+
+typedef enum {
+    AVS_VIDEO     = 0x01,
+    AVS_AUDIO     = 0x02,
+    AVS_PALETTE   = 0x03,
+    AVS_GAME_DATA = 0x04,
+} avs_block_type_t;
+
+typedef enum {
+    AVS_I_FRAME     = 0x00,
+    AVS_P_FRAME_3X3 = 0x01,
+    AVS_P_FRAME_2X2 = 0x02,
+    AVS_P_FRAME_2X3 = 0x03,
+} avs_video_sub_type_t;
+
+
+static int
+avs_decode_frame(AVCodecContext * avctx,
+                 void *data, int *data_size, uint8_t * buf, int buf_size)
+{
+    avs_context_t *const avs = avctx->priv_data;
+    AVFrame *picture = data;
+    AVFrame *const p = (AVFrame *) & avs->picture;
+    uint8_t *table, *vect, *out;
+    int i, j, x, y, stride, vect_w = 3, vect_h = 3;
+    int sub_type;
+    avs_block_type_t type;
+    GetBitContext change_map;
+
+    if (avctx->reget_buffer(avctx, p)) {
+        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
+        return -1;
+    }
+    p->reference = 1;
+    p->pict_type = FF_P_TYPE;
+    p->key_frame = 0;
+
+    out = avs->picture.data[0];
+    stride = avs->picture.linesize[0];
+
+    sub_type = buf[0];
+    type = buf[1];
+    buf += 4;
+
+    if (type == AVS_PALETTE) {
+        int first, last;
+        uint32_t *pal = (uint32_t *) avs->picture.data[1];
+
+        first = LE_16(buf);
+        last = first + LE_16(buf + 2);
+        buf += 4;
+        for (i=first; i<last; i++, buf+=3)
+            pal[i] = (buf[0] << 18) | (buf[1] << 10) | (buf[2] << 2);
+
+        sub_type = buf[0];
+        type = buf[1];
+        buf += 4;
+    }
+
+    if (type != AVS_VIDEO)
+        return -1;
+
+    switch (sub_type) {
+    case AVS_I_FRAME:
+        p->pict_type = FF_I_TYPE;
+        p->key_frame = 1;
+    case AVS_P_FRAME_3X3:
+        vect_w = 3;
+        vect_h = 3;
+        break;
+
+    case AVS_P_FRAME_2X2:
+        vect_w = 2;
+        vect_h = 2;
+        break;
+
+    case AVS_P_FRAME_2X3:
+        vect_w = 2;
+        vect_h = 3;
+        break;
+
+    default:
+      return -1;
+    }
+
+    table = buf + (256 * vect_w * vect_h);
+    if (sub_type != AVS_I_FRAME) {
+        int map_size = ((318 / vect_w + 7) / 8) * (198 / vect_h);
+        init_get_bits(&change_map, table, map_size);
+        table += map_size;
+    }
+
+    for (y=0; y<198; y+=vect_h) {
+        for (x=0; x<318; x+=vect_w) {
+            if (sub_type == AVS_I_FRAME || get_bits1(&change_map)) {
+                vect = &buf[*table++ * (vect_w * vect_h)];
+                for (j=0; j<vect_w; j++) {
+                    out[(y + 0) * stride + x + j] = vect[(0 * vect_w) + j];
+                    out[(y + 1) * stride + x + j] = vect[(1 * vect_w) + j];
+                    if (vect_h == 3)
+                        out[(y + 2) * stride + x + j] =
+                            vect[(2 * vect_w) + j];
+                }
+            }
+        }
+        if (sub_type != AVS_I_FRAME)
+            align_get_bits(&change_map);
+    }
+
+    *picture = *(AVFrame *) & avs->picture;
+    *data_size = sizeof(AVPicture);
+
+    return buf_size;
+}
+
+static int avs_decode_init(AVCodecContext * avctx)
+{
+    avctx->pix_fmt = PIX_FMT_PAL8;
+    return 0;
+}
+
+AVCodec avs_decoder = {
+    "avs",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_AVS,
+    sizeof(avs_context_t),
+    avs_decode_init,
+    NULL,
+    NULL,
+    avs_decode_frame,
+    CODEC_CAP_DR1,
+};

libavformat/Makefile

@@ -18,7 +18,7 @@ OBJS+=mpeg.o mpegts.o mpegtsenc.o ffm.o crc.o img.o img2.o raw.o rm.o \
       nut.o wc3movie.o mp3.o westwood.o segafilm.o idcin.o flic.o \
       sierravmd.o matroska.o sol.o electronicarts.o nsvdec.o asf.o \
       ogg2.o oggparsevorbis.o oggparsetheora.o oggparseflac.o daud.o aiff.o \
-      voc.o tta.o mm.o
+      voc.o tta.o mm.o avs.o
 
 # muxers
 ifeq ($(CONFIG_MUXERS),yes)

libavformat/allformats.c

@@ -118,6 +118,7 @@ void av_register_all(void)
     daud_init();
     voc_init();
     tta_init();
+    avs_init();
 
 #ifdef CONFIG_MUXERS
     /* image formats */

libavformat/avformat.h

@@ -5,8 +5,8 @@
 extern "C" {
 #endif
 
-#define LIBAVFORMAT_VERSION_INT ((50<<16)+(2<<8)+1)
-#define LIBAVFORMAT_VERSION     50.2.1
+#define LIBAVFORMAT_VERSION_INT ((50<<16)+(3<<8)+0)
+#define LIBAVFORMAT_VERSION     50.3.0
 #define LIBAVFORMAT_BUILD       LIBAVFORMAT_VERSION_INT
 
 #define LIBAVFORMAT_IDENT       "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
@@ -564,6 +564,9 @@ int ff_adts_init(void);
 /* mm.c */
 int mm_init(void);
 
+/* avs.c */
+int avs_init(void);
+
 #include "rtp.h"
 
 #include "rtsp.h"

libavformat/avs.c

+/*
+ * AVS demuxer.
+ * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "avformat.h"
+#include "voc.h"
+
+
+typedef struct avs_format {
+    voc_dec_context_t voc;
+    AVStream *st_video;
+    AVStream *st_audio;
+    int width;
+    int height;
+    int bits_per_sample;
+    int fps;
+    int nb_frames;
+    int remaining_frame_size;
+    int remaining_audio_size;
+} avs_format_t;
+
+typedef enum avs_block_type {
+    AVS_VIDEO     = 0x01,
+    AVS_AUDIO     = 0x02,
+    AVS_PALETTE   = 0x03,
+    AVS_GAME_DATA = 0x04,
+} avs_block_type_t;
+
+
+#ifdef CONFIG_DEMUXERS
+
+static int avs_probe(AVProbeData * p)
+{
+    const uint8_t *d;
+
+    if (p->buf_size < 2)
+        return 0;
+    d = p->buf;
+    if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
+        return 50;
+
+    return 0;
+}
+
+static int avs_read_header(AVFormatContext * s, AVFormatParameters * ap)
+{
+    avs_format_t *avs = s->priv_data;
+
+    s->ctx_flags |= AVFMTCTX_NOHEADER;
+
+    url_fskip(&s->pb, 4);
+    avs->width = get_le16(&s->pb);
+    avs->height = get_le16(&s->pb);
+    avs->bits_per_sample = get_le16(&s->pb);
+    avs->fps = get_le16(&s->pb);
+    avs->nb_frames = get_le32(&s->pb);
+    avs->remaining_frame_size = 0;
+    avs->remaining_audio_size = 0;
+
+    avs->st_video = avs->st_audio = NULL;
+
+    if (avs->width != 318 || avs->height != 198)
+        av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "
+               "when the avs format is supposed to be 318x198 only.\n",
+               avs->width, avs->height);
+
+    return 0;
+}
+
+static int
+avs_read_video_packet(AVFormatContext * s, AVPacket * pkt,
+                      avs_block_type_t type, int sub_type, int size,
+                      uint8_t * palette, int palette_size)
+{
+    avs_format_t *avs = s->priv_data;
+    int ret;
+
+    ret = av_new_packet(pkt, size + palette_size);
+    if (ret < 0)
+        return ret;
+
+    if (palette_size) {
+        pkt->data[0] = 0x00;
+        pkt->data[1] = 0x03;
+        pkt->data[2] = palette_size & 0xFF;
+        pkt->data[3] = (palette_size >> 8) & 0xFF;
+        memcpy(pkt->data + 4, palette, palette_size - 4);
+    }
+
+    pkt->data[palette_size + 0] = sub_type;
+    pkt->data[palette_size + 1] = type;
+    pkt->data[palette_size + 2] = size & 0xFF;
+    pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
+    ret = get_buffer(&s->pb, pkt->data + palette_size + 4, size - 4) + 4;
+    if (ret < size) {
+        av_free_packet(pkt);
+        return AVERROR_IO;
+    }
+
+    pkt->size = ret + palette_size;
+    pkt->stream_index = avs->st_video->index;
+    if (sub_type == 0)
+        pkt->flags |= PKT_FLAG_KEY;
+
+    return 0;
+}
+
+static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt)
+{
+    avs_format_t *avs = s->priv_data;
+    int ret, size;
+
+    size = url_ftell(&s->pb);
+    ret = voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
+    size = url_ftell(&s->pb) - size;
+    avs->remaining_audio_size -= size;
+
+    if (ret == AVERROR_IO)
+        return 0;    /* this indicate EOS */
+    if (ret < 0)
+        return ret;
+
+    pkt->stream_index = avs->st_audio->index;
+    pkt->flags |= PKT_FLAG_KEY;
+
+    return size;
+}
+
+static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
+{
+    avs_format_t *avs = s->priv_data;
+    int sub_type = 0, size = 0;
+    avs_block_type_t type = 0;
+    int palette_size = 0;
+    uint8_t palette[4 + 3 * 256];
+    int ret;
+
+    if (avs->remaining_audio_size > 0)
+        if (avs_read_audio_packet(s, pkt) > 0)
+            return 0;
+
+    while (1) {
+        if (avs->remaining_frame_size <= 0) {
+            if (!get_le16(&s->pb))    /* found EOF */
+                return AVERROR_IO;
+            avs->remaining_frame_size = get_le16(&s->pb) - 4;
+        }
+
+        while (avs->remaining_frame_size > 0) {
+            sub_type = get_byte(&s->pb);
+            type = get_byte(&s->pb);
+            size = get_le16(&s->pb);
+            avs->remaining_frame_size -= size;
+
+            switch (type) {
+            case AVS_PALETTE:
+                ret = get_buffer(&s->pb, palette, size - 4);
+                if (ret < size - 4)
+                    return AVERROR_IO;
+                palette_size = size;
+                break;
+
+            case AVS_VIDEO:
+                if (!avs->st_video) {
+                    avs->st_video = av_new_stream(s, AVS_VIDEO);
+                    if (avs->st_video == NULL)
+                        return AVERROR_NOMEM;
+                    avs->st_video->codec->codec_type = CODEC_TYPE_VIDEO;
+                    avs->st_video->codec->codec_id = CODEC_ID_AVS;
+                    avs->st_video->codec->width = avs->width;
+                    avs->st_video->codec->height = avs->height;
+                    avs->st_video->codec->bits_per_sample=avs->bits_per_sample;
+                    avs->st_video->nb_frames = avs->nb_frames;
+                    avs->st_video->codec->time_base = (AVRational) {
+                    1, avs->fps};
+                }
+                return avs_read_video_packet(s, pkt, type, sub_type, size,
+                                             palette, palette_size);
+
+            case AVS_AUDIO:
+                if (!avs->st_audio) {
+                    avs->st_audio = av_new_stream(s, AVS_AUDIO);
+                    if (avs->st_audio == NULL)
+                        return AVERROR_NOMEM;
+                    avs->st_audio->codec->codec_type = CODEC_TYPE_AUDIO;
+                }
+                avs->remaining_audio_size = size - 4;
+                size = avs_read_audio_packet(s, pkt);
+                if (size != 0)
+                    return size;
+                break;
+
+            default:
+                url_fskip(&s->pb, size - 4);
+            }
+        }
+    }
+}
+
+static int avs_read_close(AVFormatContext * s)
+{
+    return 0;
+}
+
+static AVInputFormat avs_iformat = {
+    "avs",
+    "avs format",
+    sizeof(avs_format_t),
+    avs_probe,
+    avs_read_header,
+    avs_read_packet,
+    avs_read_close,
+};
+
+#endif /* CONFIG_DEMUXERS */
+
+int avs_init(void)
+{
+#ifdef CONFIG_DEMUXERS
+    av_register_input_format(&avs_iformat);
+#endif /* CONFIG_DEMUXERS */
+    return 0;
+}