PAF demuxer and decoder

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 257 insertions, 0 deletions

diff --git a/libavformat/paf.c b/libavformat/paf.c
new file mode 100644
index 0000000000..5261ecf1ef
--- /dev/null
+++ b/libavformat/paf.c
@@ -0,0 +1,257 @@
+/*
+ * Packed Animation File demuxer
+ * Copyright (c) 2012 Paul B Mahol
+ *
+ * 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
+ */
+
+#include "libavcodec/paf.h"
+#include "avformat.h"
+#include "internal.h"
+
+#define MAGIC "Packed Animation File V1.0\n(c) 1992-96 Amazing Studio\x0a\x1a"
+
+typedef struct {
+    uint32_t buffer_size;
+    uint32_t frame_blks;
+    uint32_t nb_frames;
+    uint32_t start_offset;
+    uint32_t preload_count;
+    uint32_t max_video_blks;
+    uint32_t max_audio_blks;
+
+    uint32_t current_frame;
+    uint32_t current_frame_count;
+    uint32_t current_frame_block;
+
+    uint32_t *blocks_count_table;
+    uint32_t *frames_offset_table;
+    uint32_t *blocks_offset_table;
+
+    uint8_t  *video_frame;
+    int      video_size;
+
+    uint8_t  *audio_frame;
+    uint8_t  *temp_audio_frame;
+    int      audio_size;
+
+    int      got_audio;
+} PAFDemuxContext;
+
+static int read_probe(AVProbeData *p)
+{
+    if ((p->buf_size >= strlen(MAGIC)) &&
+        !memcmp(p->buf, MAGIC, strlen(MAGIC)))
+        return AVPROBE_SCORE_MAX;
+    return 0;
+}
+
+static int read_close(AVFormatContext *s)
+{
+    PAFDemuxContext *p = s->priv_data;
+
+    av_freep(&p->blocks_count_table);
+    av_freep(&p->frames_offset_table);
+    av_freep(&p->blocks_offset_table);
+    av_freep(&p->video_frame);
+    av_freep(&p->audio_frame);
+    av_freep(&p->temp_audio_frame);
+
+    return 0;
+}
+
+static void read_table(AVFormatContext *s, uint32_t *table, uint32_t count)
+{
+    int i;
+
+    for (i = 0; i < count; i++)
+        table[i] = avio_rl32(s->pb);
+
+    avio_skip(s->pb, 4 * (FFALIGN(count, 512) - count));
+}
+
+static int read_header(AVFormatContext *s)
+{
+    PAFDemuxContext *p = s->priv_data;
+    AVIOContext     *pb = s->pb;
+    AVStream        *ast, *vst;
+    int             ret = 0;
+
+    avio_skip(pb, 132);
+
+    vst = avformat_new_stream(s, 0);
+    if (!vst)
+        return AVERROR(ENOMEM);
+
+    vst->start_time = 0;
+    vst->nb_frames  =
+    vst->duration   =
+    p->nb_frames = avio_rl32(pb);
+    avio_skip(pb, 4);
+    vst->codec->width  = avio_rl32(pb);
+    vst->codec->height = avio_rl32(pb);
+    avio_skip(pb, 4);
+    vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+    vst->codec->codec_tag  = 0;
+    vst->codec->codec_id   = CODEC_ID_PAF_VIDEO;
+    avpriv_set_pts_info(vst, 64, 1, 10);
+
+    ast = avformat_new_stream(s, 0);
+    if (!ast)
+        return AVERROR(ENOMEM);
+
+    ast->start_time         = 0;
+    ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
+    ast->codec->codec_tag   = 0;
+    ast->codec->codec_id    = CODEC_ID_PAF_AUDIO;
+    ast->codec->channels    = 2;
+    ast->codec->sample_rate = 22050;
+    avpriv_set_pts_info(ast, 64, 1, 22050);
+
+    p->buffer_size    = avio_rl32(pb);
+    p->preload_count  = avio_rl32(pb);
+    p->frame_blks     = avio_rl32(pb);
+    p->start_offset   = avio_rl32(pb);
+    p->max_video_blks = avio_rl32(pb);
+    p->max_audio_blks = avio_rl32(pb);
+    if (p->buffer_size    < 175  ||
+        p->max_audio_blks < 2    ||
+        p->max_video_blks < 1    ||
+        p->frame_blks     < 1    ||
+        p->nb_frames      < 1    ||
+        p->preload_count  < 1    ||
+        p->buffer_size    > 2048 ||
+        p->max_video_blks > 2048 ||
+        p->max_audio_blks > 2048 ||
+        p->nb_frames      > INT_MAX / sizeof(uint32_t) ||
+        p->frame_blks     > INT_MAX / sizeof(uint32_t))
+        return AVERROR_INVALIDDATA;
+
+    p->blocks_count_table  = av_mallocz(p->nb_frames  * sizeof(uint32_t));
+    p->frames_offset_table = av_mallocz(p->nb_frames  * sizeof(uint32_t));
+    p->blocks_offset_table = av_mallocz(p->frame_blks * sizeof(uint32_t));
+
+    p->video_size          = p->max_video_blks * p->buffer_size;
+    p->video_frame         = av_mallocz(p->video_size);
+
+    p->audio_size          = p->max_audio_blks * p->buffer_size;
+    p->audio_frame         = av_mallocz(p->audio_size);
+    p->temp_audio_frame    = av_mallocz(p->audio_size);
+
+    if (!p->blocks_count_table  ||
+        !p->frames_offset_table ||
+        !p->blocks_offset_table ||
+        !p->video_frame         ||
+        !p->audio_frame         ||
+        !p->temp_audio_frame) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    avio_seek(pb, p->buffer_size, SEEK_SET);
+
+    read_table(s, p->blocks_count_table,  p->nb_frames);
+    read_table(s, p->frames_offset_table, p->nb_frames);
+    read_table(s, p->blocks_offset_table, p->frame_blks);
+
+    p->got_audio = 0;
+    p->current_frame = 0;
+    p->current_frame_block = 0;
+
+    avio_seek(pb, p->start_offset, SEEK_SET);
+
+    return 0;
+
+fail:
+    read_close(s);
+
+    return ret;
+}
+
+static int read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    PAFDemuxContext *p = s->priv_data;
+    AVIOContext     *pb = s->pb;
+    uint32_t        count, offset;
+    int             size, i;
+
+    if (p->current_frame >= p->nb_frames)
+        return AVERROR_EOF;
+
+    if (url_feof(pb))
+        return AVERROR_EOF;
+
+    if (p->got_audio) {
+        if (av_new_packet(pkt, p->audio_size) < 0)
+            return AVERROR(ENOMEM);
+
+        memcpy(pkt->data, p->temp_audio_frame, p->audio_size);
+        pkt->duration     = PAF_SOUND_SAMPLES * p->audio_size / PAF_SOUND_FRAME_SIZE;
+        pkt->flags       |= AV_PKT_FLAG_KEY;
+        pkt->stream_index = 1;
+        p->got_audio      = 0;
+        return pkt->size;
+    }
+
+    count = (p->current_frame == 0) ? p->preload_count : p->blocks_count_table[p->current_frame - 1];
+    for (i = 0; i < count; i++) {
+        if (p->current_frame_block >= p->frame_blks)
+            return AVERROR_INVALIDDATA;
+
+        offset = p->blocks_offset_table[p->current_frame_block] & ~(1 << 31);
+        if (p->blocks_offset_table[p->current_frame_block] & (1 << 31)) {
+            if (offset > p->audio_size - p->buffer_size)
+                return AVERROR_INVALIDDATA;
+
+            avio_read(pb, p->audio_frame + offset, p->buffer_size);
+            if (offset == (p->max_audio_blks - 2) * p->buffer_size) {
+                memcpy(p->temp_audio_frame, p->audio_frame, p->audio_size);
+                p->got_audio = 1;
+            }
+        } else {
+            if (offset > p->video_size - p->buffer_size)
+                return AVERROR_INVALIDDATA;
+
+            avio_read(pb, p->video_frame + offset, p->buffer_size);
+        }
+        p->current_frame_block++;
+    }
+
+    size = p->video_size - p->frames_offset_table[p->current_frame];
+    if (size < 0)
+        return AVERROR_INVALIDDATA;
+
+    if (av_new_packet(pkt, size) < 0)
+        return AVERROR(ENOMEM);
+
+    pkt->stream_index = 0;
+    pkt->duration     = 1;
+    memcpy(pkt->data, p->video_frame + p->frames_offset_table[p->current_frame], size);
+    p->current_frame++;
+
+    return pkt->size;
+}
+
+AVInputFormat ff_paf_demuxer = {
+    .name           = "paf",
+    .long_name      = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"),
+    .priv_data_size = sizeof(PAFDemuxContext),
+    .read_probe     = read_probe,
+    .read_header    = read_header,
+    .read_packet    = read_packet,
+    .read_close     = read_close,
+};