PAF demuxer and decoder

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

1 files changed, 454 insertions, 0 deletions

diff --git a/libavcodec/paf.c b/libavcodec/paf.c
new file mode 100644
index 0000000000..ff5db838bf
--- /dev/null
+++ b/libavcodec/paf.c
@@ -0,0 +1,454 @@
+/*
+ * Packed Animation File video and audio decoder
+ * 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 "libavutil/intreadwrite.h"
+#include "libavcodec/dsputil.h"
+#include "libavcodec/paf.h"
+#include "bytestream.h"
+#include "avcodec.h"
+
+static const uint8_t block_sequences[16][8] =
+{
+    { 0, 0, 0, 0, 0, 0, 0, 0 },
+    { 2, 0, 0, 0, 0, 0, 0, 0 },
+    { 5, 7, 0, 0, 0, 0, 0, 0 },
+    { 5, 0, 0, 0, 0, 0, 0, 0 },
+    { 6, 0, 0, 0, 0, 0, 0, 0 },
+    { 5, 7, 5, 7, 0, 0, 0, 0 },
+    { 5, 7, 5, 0, 0, 0, 0, 0 },
+    { 5, 7, 6, 0, 0, 0, 0, 0 },
+    { 5, 5, 0, 0, 0, 0, 0, 0 },
+    { 3, 0, 0, 0, 0, 0, 0, 0 },
+    { 6, 6, 0, 0, 0, 0, 0, 0 },
+    { 2, 4, 0, 0, 0, 0, 0, 0 },
+    { 2, 4, 5, 7, 0, 0, 0, 0 },
+    { 2, 4, 5, 0, 0, 0, 0, 0 },
+    { 2, 4, 6, 0, 0, 0, 0, 0 },
+    { 2, 4, 5, 7, 5, 7, 0, 0 }
+};
+
+typedef struct PAFVideoDecContext {
+    AVFrame  pic;
+    GetByteContext gb;
+
+    int     current_frame;
+    uint8_t *frame[4];
+    int     frame_size;
+    int     video_size;
+
+    uint8_t *opcodes;
+} PAFVideoDecContext;
+
+static av_cold int paf_vid_init(AVCodecContext *avctx)
+{
+    PAFVideoDecContext *c = avctx->priv_data;
+    int i;
+
+    if (avctx->height & 3 || avctx->width & 3) {
+        av_log(avctx, AV_LOG_ERROR, "width and height must be multiplies of 4\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    avctx->pix_fmt = PIX_FMT_PAL8;
+
+    avcodec_get_frame_defaults(&c->pic);
+    c->frame_size = FFALIGN(avctx->height, 256) * avctx->width;
+    c->video_size = avctx->height * avctx->width;
+    for (i = 0; i < 4; i++) {
+        c->frame[i] = av_mallocz(c->frame_size);
+        if (!c->frame[i])
+            return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+static int get_video_page_offset(AVCodecContext *avctx, uint8_t a, uint8_t b)
+{
+    int x, y;
+
+    x = b & 0x7F;
+    y = ((a & 0x3F) << 1) | (b >> 7 & 1);
+
+    return y * 2 * avctx->width + x * 2;
+}
+
+static void copy4h(AVCodecContext *avctx, uint8_t *dst)
+{
+    PAFVideoDecContext *c = avctx->priv_data;
+    int i;
+
+    for (i = 0; i < 4; i++) {
+        bytestream2_get_buffer(&c->gb, dst, 4);
+        dst += avctx->width;
+    }
+}
+
+static void copy_color_mask(AVCodecContext *avctx, uint8_t mask, uint8_t *dst, uint8_t color)
+{
+    int i;
+
+    for (i = 0; i < 4; i++) {
+        if ((mask >> 4) & (1 << (3 - i)))
+            dst[i] = color;
+        if ((mask & 15) & (1 << (3 - i)))
+            dst[avctx->width + i] = color;
+    }
+}
+
+static void copy_src_mask(AVCodecContext *avctx, uint8_t mask, uint8_t *dst, const uint8_t *src)
+{
+    int i;
+
+    for (i = 0; i < 4; i++) {
+        if ((mask >> 4) & (1 << (3 - i)))
+            dst[i] = src[i];
+        if ((mask & 15) & (1 << (3 - i)))
+            dst[avctx->width + i] = src[avctx->width + i];
+    }
+}
+
+static int decode_0(AVCodecContext *avctx, uint8_t code, uint8_t *pkt)
+{
+    PAFVideoDecContext *c = avctx->priv_data;
+    uint32_t opcode_size, offset;
+    uint8_t *dst, *dend, mask = 0, color = 0, a, b, p;
+    const uint8_t *src, *send, *opcodes;
+    int  i, j, x = 0;
+
+    i = bytestream2_get_byte(&c->gb);
+    if (i) {
+        if (code & 0x10) {
+            int align;
+
+            align = bytestream2_tell(&c->gb) & 3;
+            if (align)
+                bytestream2_skip(&c->gb, 4 - align);
+        }
+        do {
+            a      = bytestream2_get_byte(&c->gb);
+            b      = bytestream2_get_byte(&c->gb);
+            p      = (a & 0xC0) >> 6;
+            dst    = c->frame[p] + get_video_page_offset(avctx, a, b);
+            dend   = c->frame[p] + c->frame_size;
+            offset = (b & 0x7F) * 2;
+            j      = bytestream2_get_le16(&c->gb) + offset;
+
+            do {
+                offset++;
+                if (dst + 3 * avctx->width + 4 > dend)
+                    return AVERROR_INVALIDDATA;
+                copy4h(avctx, dst);
+                if ((offset & 0x3F) == 0)
+                    dst += avctx->width * 3;
+                dst += 4;
+            } while (offset < j);
+        } while (--i);
+    }
+
+    dst = c->frame[c->current_frame];
+    do {
+        a    = bytestream2_get_byte(&c->gb);
+        b    = bytestream2_get_byte(&c->gb);
+        p    = (a & 0xC0) >> 6;
+        src  = c->frame[p] + get_video_page_offset(avctx, a, b);
+        send = c->frame[p] + c->frame_size;
+        if (src + 3 * avctx->width + 4 > send)
+            return AVERROR_INVALIDDATA;
+        copy_block4(dst, src, avctx->width, avctx->width, 4);
+        i++;
+        if ((i & 0x3F) == 0)
+            dst += avctx->width * 3;
+        dst += 4;
+    } while (i < c->video_size / 16);
+
+    opcode_size = bytestream2_get_le16(&c->gb);
+    bytestream2_skip(&c->gb, 2);
+
+    if (bytestream2_get_bytes_left(&c->gb) < opcode_size)
+        return AVERROR_INVALIDDATA;
+
+    opcodes = pkt + bytestream2_tell(&c->gb);
+    bytestream2_skipu(&c->gb, opcode_size);
+
+    dst = c->frame[c->current_frame];
+
+    for (i = 0; i < avctx->height; i += 4, dst += avctx->width * 3) {
+        for (j = 0; j < avctx->width; j += 4, dst += 4) {
+            int opcode, k = 0;
+
+            if (x > opcode_size)
+                return AVERROR_INVALIDDATA;
+            if (j & 4) {
+                opcode = opcodes[x] & 15;
+                x++;
+            } else {
+                opcode = opcodes[x] >> 4;
+            }
+
+            while (block_sequences[opcode][k]) {
+
+                offset = avctx->width * 2;
+                code   = block_sequences[opcode][k++];
+
+                switch (code) {
+                case 2:
+                    offset = 0;
+                case 3:
+                    color  = bytestream2_get_byte(&c->gb);
+                case 4:
+                    mask   = bytestream2_get_byte(&c->gb);
+                    copy_color_mask(avctx, mask, dst + offset, color);
+                    break;
+                case 5:
+                    offset = 0;
+                case 6:
+                    a    = bytestream2_get_byte(&c->gb);
+                    b    = bytestream2_get_byte(&c->gb);
+                    p    = (a & 0xC0) >> 6;
+                    src  = c->frame[p] + get_video_page_offset(avctx, a, b);
+                    send = c->frame[p] + c->frame_size;
+                case 7:
+                    if (src + offset + avctx->width + 4 > send)
+                        return AVERROR_INVALIDDATA;
+                    mask = bytestream2_get_byte(&c->gb);
+                    copy_src_mask(avctx, mask, dst + offset, src + offset);
+                    break;
+                }
+            }
+        }
+    }
+
+    return 0;
+}
+
+static int paf_vid_decode(AVCodecContext *avctx, void *data,
+                          int *data_size, AVPacket *pkt)
+{
+    PAFVideoDecContext *c = avctx->priv_data;
+    uint8_t code, *dst, *src, *end;
+    int i, frame, ret;
+
+    if (c->pic.data[0])
+        avctx->release_buffer(avctx, &c->pic);
+
+    c->pic.reference = 0;
+    if ((ret = avctx->get_buffer(avctx, &c->pic)) < 0)
+        return ret;
+
+    bytestream2_init(&c->gb, pkt->data, pkt->size);
+
+    code = bytestream2_get_byte(&c->gb);
+    if (code & 0x20) {
+        for (i = 0; i < 4; i++)
+            memset(c->frame[i], 0, c->frame_size);
+
+        memset(c->pic.data[1], 0, AVPALETTE_SIZE);
+        c->current_frame = 0;
+        c->pic.key_frame = 1;
+        c->pic.pict_type = AV_PICTURE_TYPE_I;
+    } else {
+        c->pic.key_frame = 0;
+        c->pic.pict_type = AV_PICTURE_TYPE_P;
+    }
+
+    if (code & 0x40) {
+        uint32_t *out = (uint32_t *)c->pic.data[1];
+        int index, count;
+
+        index = bytestream2_get_byte(&c->gb);
+        count = bytestream2_get_byte(&c->gb) + 1;
+
+        if (index + count > AVPALETTE_SIZE)
+            return AVERROR_INVALIDDATA;
+        if (bytestream2_get_bytes_left(&c->gb) < 3 * AVPALETTE_SIZE)
+            return AVERROR_INVALIDDATA;
+
+        out += index;
+        for (i = 0; i < count; i++) {
+            unsigned r, g, b;
+
+            r = bytestream2_get_byteu(&c->gb);
+            r = r << 2 | r >> 4;
+            g = bytestream2_get_byteu(&c->gb);
+            g = g << 2 | g >> 4;
+            b = bytestream2_get_byteu(&c->gb);
+            b = b << 2 | b >> 4;
+            *out++ = 0xFFU << 24 | r << 16 | g << 8 | b;
+        }
+        c->pic.palette_has_changed = 1;
+    }
+
+    switch (code & 0x0F) {
+    case 0:
+        if ((ret = decode_0(avctx, code, pkt->data)) < 0)
+            return ret;
+        break;
+    case 1:
+        dst = c->frame[c->current_frame];
+        bytestream2_skip(&c->gb, 2);
+        if (bytestream2_get_bytes_left(&c->gb) < c->video_size)
+            return AVERROR_INVALIDDATA;
+        bytestream2_get_bufferu(&c->gb, dst, c->video_size);
+        break;
+    case 2:
+        frame = bytestream2_get_byte(&c->gb);
+        if (frame > 3)
+            return AVERROR_INVALIDDATA;
+        if (frame != c->current_frame)
+            memcpy(c->frame[c->current_frame], c->frame[frame], c->frame_size);
+        break;
+    case 4:
+        dst = c->frame[c->current_frame];
+        end = dst + c->video_size;
+
+        bytestream2_skip(&c->gb, 2);
+
+        while (dst < end) {
+            int8_t code;
+            int count;
+
+            if (bytestream2_get_bytes_left(&c->gb) < 2)
+                return AVERROR_INVALIDDATA;
+
+            code  = bytestream2_get_byteu(&c->gb);
+            count = FFABS(code) + 1;
+
+            if (dst + count > end)
+                return AVERROR_INVALIDDATA;
+            if (code < 0)
+                memset(dst, bytestream2_get_byteu(&c->gb), count);
+            else
+                bytestream2_get_buffer(&c->gb, dst, count);
+            dst += count;
+        }
+        break;
+    default:
+        av_log_ask_for_sample(avctx, "unknown/invalid code\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    dst = c->pic.data[0];
+    src = c->frame[c->current_frame];
+    for (i = 0; i < avctx->height; i++) {
+        memcpy(dst, src, avctx->width);
+        dst += c->pic.linesize[0];
+        src += avctx->width;
+    }
+
+    c->current_frame = (c->current_frame + 1) & 3;
+
+    *data_size       = sizeof(AVFrame);
+    *(AVFrame *)data = c->pic;
+
+    return pkt->size;
+}
+
+static av_cold int paf_vid_close(AVCodecContext *avctx)
+{
+    PAFVideoDecContext *c = avctx->priv_data;
+    int i;
+
+    if (c->pic.data[0])
+        avctx->release_buffer(avctx, &c->pic);
+
+    for (i = 0; i < 4; i++)
+        av_freep(&c->frame[i]);
+
+    return 0;
+}
+
+typedef struct PAFAudioDecContext {
+    AVFrame frame;
+} PAFAudioDecContext;
+
+static av_cold int paf_aud_init(AVCodecContext *avctx)
+{
+    PAFAudioDecContext *c = avctx->priv_data;
+
+    if (avctx->channels != 2) {
+        av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    avcodec_get_frame_defaults(&c->frame);
+    avctx->channel_layout = AV_CH_LAYOUT_STEREO;
+    avctx->coded_frame    = &c->frame;
+    avctx->sample_fmt     = AV_SAMPLE_FMT_S16;
+
+    return 0;
+}
+
+static int paf_aud_decode(AVCodecContext *avctx, void *data,
+                          int *got_frame_ptr, AVPacket *pkt)
+{
+    PAFAudioDecContext *c = avctx->priv_data;
+    uint8_t *buf = pkt->data;
+    int16_t *output_samples;
+    const uint8_t *t;
+    int frames, ret, i, j, k;
+
+    frames = pkt->size / PAF_SOUND_FRAME_SIZE;
+    if (frames < 1)
+        return AVERROR_INVALIDDATA;
+
+    c->frame.nb_samples = PAF_SOUND_SAMPLES * frames;
+    if ((ret = avctx->get_buffer(avctx, &c->frame)) < 0)
+        return ret;
+
+    output_samples = (int16_t *)c->frame.data[0];
+    for (i = 0; i < frames; i++) {
+        t = buf + 256 * sizeof(uint16_t);
+        for (j = 0; j < PAF_SOUND_SAMPLES; j++) {
+            for (k = 0; k < 2; k++) {
+                *output_samples++ = AV_RL16(buf + *t++ * 2);
+            }
+        }
+        buf += PAF_SOUND_FRAME_SIZE;
+    }
+
+    *got_frame_ptr   = 1;
+    *(AVFrame *)data = c->frame;
+
+    return pkt->size;
+}
+
+AVCodec ff_paf_video_decoder = {
+    .name           = "paf_video",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = CODEC_ID_PAF_VIDEO,
+    .priv_data_size = sizeof(PAFVideoDecContext),
+    .init           = paf_vid_init,
+    .close          = paf_vid_close,
+    .decode         = paf_vid_decode,
+    .long_name      = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Video"),
+};
+
+AVCodec ff_paf_audio_decoder = {
+    .name           = "paf_audio",
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = CODEC_ID_PAF_AUDIO,
+    .priv_data_size = sizeof(PAFAudioDecContext),
+    .init           = paf_aud_init,
+    .decode         = paf_aud_decode,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Audio"),
+};