yading@10: /*
yading@10:  * Packed Animation File video and audio decoder
yading@10:  * Copyright (c) 2012 Paul B Mahol
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "libavutil/intreadwrite.h"
yading@10: #include "libavcodec/paf.h"
yading@10: #include "bytestream.h"
yading@10: #include "avcodec.h"
yading@10: #include "copy_block.h"
yading@10: #include "internal.h"
yading@10: 
yading@10: 
yading@10: static const uint8_t block_sequences[16][8] =
yading@10: {
yading@10:     { 0, 0, 0, 0, 0, 0, 0, 0 },
yading@10:     { 2, 0, 0, 0, 0, 0, 0, 0 },
yading@10:     { 5, 7, 0, 0, 0, 0, 0, 0 },
yading@10:     { 5, 0, 0, 0, 0, 0, 0, 0 },
yading@10:     { 6, 0, 0, 0, 0, 0, 0, 0 },
yading@10:     { 5, 7, 5, 7, 0, 0, 0, 0 },
yading@10:     { 5, 7, 5, 0, 0, 0, 0, 0 },
yading@10:     { 5, 7, 6, 0, 0, 0, 0, 0 },
yading@10:     { 5, 5, 0, 0, 0, 0, 0, 0 },
yading@10:     { 3, 0, 0, 0, 0, 0, 0, 0 },
yading@10:     { 6, 6, 0, 0, 0, 0, 0, 0 },
yading@10:     { 2, 4, 0, 0, 0, 0, 0, 0 },
yading@10:     { 2, 4, 5, 7, 0, 0, 0, 0 },
yading@10:     { 2, 4, 5, 0, 0, 0, 0, 0 },
yading@10:     { 2, 4, 6, 0, 0, 0, 0, 0 },
yading@10:     { 2, 4, 5, 7, 5, 7, 0, 0 }
yading@10: };
yading@10: 
yading@10: typedef struct PAFVideoDecContext {
yading@10:     AVFrame  *pic;
yading@10:     GetByteContext gb;
yading@10: 
yading@10:     int     current_frame;
yading@10:     uint8_t *frame[4];
yading@10:     int     frame_size;
yading@10:     int     video_size;
yading@10: 
yading@10:     uint8_t *opcodes;
yading@10: } PAFVideoDecContext;
yading@10: 
yading@10: static av_cold int paf_vid_close(AVCodecContext *avctx)
yading@10: {
yading@10:     PAFVideoDecContext *c = avctx->priv_data;
yading@10:     int i;
yading@10: 
yading@10:     av_frame_free(&c->pic);
yading@10: 
yading@10:     for (i = 0; i < 4; i++)
yading@10:         av_freep(&c->frame[i]);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int paf_vid_init(AVCodecContext *avctx)
yading@10: {
yading@10:     PAFVideoDecContext *c = avctx->priv_data;
yading@10:     int i;
yading@10: 
yading@10:     if (avctx->height & 3 || avctx->width & 3) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "width and height must be multiplies of 4\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     avctx->pix_fmt = AV_PIX_FMT_PAL8;
yading@10: 
yading@10:     c->pic = av_frame_alloc();
yading@10:     if (!c->pic)
yading@10:         return AVERROR(ENOMEM);
yading@10: 
yading@10:     c->frame_size = FFALIGN(avctx->height, 256) * avctx->width;
yading@10:     c->video_size = avctx->height * avctx->width;
yading@10:     for (i = 0; i < 4; i++) {
yading@10:         c->frame[i] = av_mallocz(c->frame_size);
yading@10:         if (!c->frame[i]) {
yading@10:             paf_vid_close(avctx);
yading@10:             return AVERROR(ENOMEM);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int get_video_page_offset(AVCodecContext *avctx, uint8_t a, uint8_t b)
yading@10: {
yading@10:     int x, y;
yading@10: 
yading@10:     x = b & 0x7F;
yading@10:     y = ((a & 0x3F) << 1) | (b >> 7 & 1);
yading@10: 
yading@10:     return y * 2 * avctx->width + x * 2;
yading@10: }
yading@10: 
yading@10: static void copy4h(AVCodecContext *avctx, uint8_t *dst)
yading@10: {
yading@10:     PAFVideoDecContext *c = avctx->priv_data;
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < 4; i++) {
yading@10:         bytestream2_get_buffer(&c->gb, dst, 4);
yading@10:         dst += avctx->width;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void copy_color_mask(AVCodecContext *avctx, uint8_t mask, uint8_t *dst, uint8_t color)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < 4; i++) {
yading@10:         if ((mask >> 4) & (1 << (3 - i)))
yading@10:             dst[i] = color;
yading@10:         if ((mask & 15) & (1 << (3 - i)))
yading@10:             dst[avctx->width + i] = color;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void copy_src_mask(AVCodecContext *avctx, uint8_t mask, uint8_t *dst, const uint8_t *src)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < 4; i++) {
yading@10:         if ((mask >> 4) & (1 << (3 - i)))
yading@10:             dst[i] = src[i];
yading@10:         if ((mask & 15) & (1 << (3 - i)))
yading@10:             dst[avctx->width + i] = src[avctx->width + i];
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int decode_0(AVCodecContext *avctx, uint8_t code, uint8_t *pkt)
yading@10: {
yading@10:     PAFVideoDecContext *c = avctx->priv_data;
yading@10:     uint32_t opcode_size, offset;
yading@10:     uint8_t *dst, *dend, mask = 0, color = 0, a, b, p;
yading@10:     const uint8_t *src, *send, *opcodes;
yading@10:     int  i, j, x = 0;
yading@10: 
yading@10:     i = bytestream2_get_byte(&c->gb);
yading@10:     if (i) {
yading@10:         if (code & 0x10) {
yading@10:             int align;
yading@10: 
yading@10:             align = bytestream2_tell(&c->gb) & 3;
yading@10:             if (align)
yading@10:                 bytestream2_skip(&c->gb, 4 - align);
yading@10:         }
yading@10:         do {
yading@10:             a      = bytestream2_get_byte(&c->gb);
yading@10:             b      = bytestream2_get_byte(&c->gb);
yading@10:             p      = (a & 0xC0) >> 6;
yading@10:             dst    = c->frame[p] + get_video_page_offset(avctx, a, b);
yading@10:             dend   = c->frame[p] + c->frame_size;
yading@10:             offset = (b & 0x7F) * 2;
yading@10:             j      = bytestream2_get_le16(&c->gb) + offset;
yading@10: 
yading@10:             do {
yading@10:                 offset++;
yading@10:                 if (dst + 3 * avctx->width + 4 > dend)
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 copy4h(avctx, dst);
yading@10:                 if ((offset & 0x3F) == 0)
yading@10:                     dst += avctx->width * 3;
yading@10:                 dst += 4;
yading@10:             } while (offset < j);
yading@10:         } while (--i);
yading@10:     }
yading@10: 
yading@10:     dst  = c->frame[c->current_frame];
yading@10:     dend = c->frame[c->current_frame] + c->frame_size;
yading@10:     do {
yading@10:         a    = bytestream2_get_byte(&c->gb);
yading@10:         b    = bytestream2_get_byte(&c->gb);
yading@10:         p    = (a & 0xC0) >> 6;
yading@10:         src  = c->frame[p] + get_video_page_offset(avctx, a, b);
yading@10:         send = c->frame[p] + c->frame_size;
yading@10:         if ((src + 3 * avctx->width + 4 > send) ||
yading@10:             (dst + 3 * avctx->width + 4 > dend))
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         copy_block4(dst, src, avctx->width, avctx->width, 4);
yading@10:         i++;
yading@10:         if ((i & 0x3F) == 0)
yading@10:             dst += avctx->width * 3;
yading@10:         dst += 4;
yading@10:     } while (i < c->video_size / 16);
yading@10: 
yading@10:     opcode_size = bytestream2_get_le16(&c->gb);
yading@10:     bytestream2_skip(&c->gb, 2);
yading@10: 
yading@10:     if (bytestream2_get_bytes_left(&c->gb) < opcode_size)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     opcodes = pkt + bytestream2_tell(&c->gb);
yading@10:     bytestream2_skipu(&c->gb, opcode_size);
yading@10: 
yading@10:     dst = c->frame[c->current_frame];
yading@10: 
yading@10:     for (i = 0; i < avctx->height; i += 4, dst += avctx->width * 3) {
yading@10:         for (j = 0; j < avctx->width; j += 4, dst += 4) {
yading@10:             int opcode, k = 0;
yading@10: 
yading@10:             if (x > opcode_size)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             if (j & 4) {
yading@10:                 opcode = opcodes[x] & 15;
yading@10:                 x++;
yading@10:             } else {
yading@10:                 opcode = opcodes[x] >> 4;
yading@10:             }
yading@10: 
yading@10:             while (block_sequences[opcode][k]) {
yading@10: 
yading@10:                 offset = avctx->width * 2;
yading@10:                 code   = block_sequences[opcode][k++];
yading@10: 
yading@10:                 switch (code) {
yading@10:                 case 2:
yading@10:                     offset = 0;
yading@10:                 case 3:
yading@10:                     color  = bytestream2_get_byte(&c->gb);
yading@10:                 case 4:
yading@10:                     mask   = bytestream2_get_byte(&c->gb);
yading@10:                     copy_color_mask(avctx, mask, dst + offset, color);
yading@10:                     break;
yading@10:                 case 5:
yading@10:                     offset = 0;
yading@10:                 case 6:
yading@10:                     a    = bytestream2_get_byte(&c->gb);
yading@10:                     b    = bytestream2_get_byte(&c->gb);
yading@10:                     p    = (a & 0xC0) >> 6;
yading@10:                     src  = c->frame[p] + get_video_page_offset(avctx, a, b);
yading@10:                     send = c->frame[p] + c->frame_size;
yading@10:                 case 7:
yading@10:                     if (src + offset + avctx->width + 4 > send)
yading@10:                         return AVERROR_INVALIDDATA;
yading@10:                     mask = bytestream2_get_byte(&c->gb);
yading@10:                     copy_src_mask(avctx, mask, dst + offset, src + offset);
yading@10:                     break;
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int paf_vid_decode(AVCodecContext *avctx, void *data,
yading@10:                           int *got_frame, AVPacket *pkt)
yading@10: {
yading@10:     PAFVideoDecContext *c = avctx->priv_data;
yading@10:     uint8_t code, *dst, *src, *end;
yading@10:     int i, frame, ret;
yading@10: 
yading@10:     if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     bytestream2_init(&c->gb, pkt->data, pkt->size);
yading@10: 
yading@10:     code = bytestream2_get_byte(&c->gb);
yading@10:     if (code & 0x20) {
yading@10:         for (i = 0; i < 4; i++)
yading@10:             memset(c->frame[i], 0, c->frame_size);
yading@10: 
yading@10:         memset(c->pic->data[1], 0, AVPALETTE_SIZE);
yading@10:         c->current_frame = 0;
yading@10:         c->pic->key_frame = 1;
yading@10:         c->pic->pict_type = AV_PICTURE_TYPE_I;
yading@10:     } else {
yading@10:         c->pic->key_frame = 0;
yading@10:         c->pic->pict_type = AV_PICTURE_TYPE_P;
yading@10:     }
yading@10: 
yading@10:     if (code & 0x40) {
yading@10:         uint32_t *out = (uint32_t *)c->pic->data[1];
yading@10:         int index, count;
yading@10: 
yading@10:         index = bytestream2_get_byte(&c->gb);
yading@10:         count = bytestream2_get_byte(&c->gb) + 1;
yading@10: 
yading@10:         if (index + count > 256)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         if (bytestream2_get_bytes_left(&c->gb) < 3*count)
yading@10:             return AVERROR_INVALIDDATA;
yading@10: 
yading@10:         out += index;
yading@10:         for (i = 0; i < count; i++) {
yading@10:             unsigned r, g, b;
yading@10: 
yading@10:             r = bytestream2_get_byteu(&c->gb);
yading@10:             r = r << 2 | r >> 4;
yading@10:             g = bytestream2_get_byteu(&c->gb);
yading@10:             g = g << 2 | g >> 4;
yading@10:             b = bytestream2_get_byteu(&c->gb);
yading@10:             b = b << 2 | b >> 4;
yading@10:             *out++ = 0xFFU << 24 | r << 16 | g << 8 | b;
yading@10:         }
yading@10:         c->pic->palette_has_changed = 1;
yading@10:     }
yading@10: 
yading@10:     switch (code & 0x0F) {
yading@10:     case 0:
yading@10:         if ((ret = decode_0(avctx, code, pkt->data)) < 0)
yading@10:             return ret;
yading@10:         break;
yading@10:     case 1:
yading@10:         dst = c->frame[c->current_frame];
yading@10:         bytestream2_skip(&c->gb, 2);
yading@10:         if (bytestream2_get_bytes_left(&c->gb) < c->video_size)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         bytestream2_get_bufferu(&c->gb, dst, c->video_size);
yading@10:         break;
yading@10:     case 2:
yading@10:         frame = bytestream2_get_byte(&c->gb);
yading@10:         if (frame > 3)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         if (frame != c->current_frame)
yading@10:             memcpy(c->frame[c->current_frame], c->frame[frame], c->frame_size);
yading@10:         break;
yading@10:     case 4:
yading@10:         dst = c->frame[c->current_frame];
yading@10:         end = dst + c->video_size;
yading@10: 
yading@10:         bytestream2_skip(&c->gb, 2);
yading@10: 
yading@10:         while (dst < end) {
yading@10:             int8_t code;
yading@10:             int count;
yading@10: 
yading@10:             if (bytestream2_get_bytes_left(&c->gb) < 2)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10: 
yading@10:             code  = bytestream2_get_byteu(&c->gb);
yading@10:             count = FFABS(code) + 1;
yading@10: 
yading@10:             if (dst + count > end)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             if (code < 0)
yading@10:                 memset(dst, bytestream2_get_byteu(&c->gb), count);
yading@10:             else
yading@10:                 bytestream2_get_buffer(&c->gb, dst, count);
yading@10:             dst += count;
yading@10:         }
yading@10:         break;
yading@10:     default:
yading@10:         avpriv_request_sample(avctx, "unknown/invalid code");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     dst = c->pic->data[0];
yading@10:     src = c->frame[c->current_frame];
yading@10:     for (i = 0; i < avctx->height; i++) {
yading@10:         memcpy(dst, src, avctx->width);
yading@10:         dst += c->pic->linesize[0];
yading@10:         src += avctx->width;
yading@10:     }
yading@10: 
yading@10:     c->current_frame = (c->current_frame + 1) & 3;
yading@10:     if ((ret = av_frame_ref(data, c->pic)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     *got_frame       = 1;
yading@10: 
yading@10:     return pkt->size;
yading@10: }
yading@10: 
yading@10: static av_cold int paf_aud_init(AVCodecContext *avctx)
yading@10: {
yading@10:     if (avctx->channels != 2) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     avctx->channel_layout = AV_CH_LAYOUT_STEREO;
yading@10:     avctx->sample_fmt     = AV_SAMPLE_FMT_S16;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int paf_aud_decode(AVCodecContext *avctx, void *data,
yading@10:                           int *got_frame_ptr, AVPacket *pkt)
yading@10: {
yading@10:     AVFrame *frame = data;
yading@10:     uint8_t *buf = pkt->data;
yading@10:     int16_t *output_samples;
yading@10:     const uint8_t *t;
yading@10:     int frames, ret, i, j, k;
yading@10: 
yading@10:     frames = pkt->size / PAF_SOUND_FRAME_SIZE;
yading@10:     if (frames < 1)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     frame->nb_samples = PAF_SOUND_SAMPLES * frames;
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     output_samples = (int16_t *)frame->data[0];
yading@10:     for (i = 0; i < frames; i++) {
yading@10:         t = buf + 256 * sizeof(uint16_t);
yading@10:         for (j = 0; j < PAF_SOUND_SAMPLES; j++) {
yading@10:             for (k = 0; k < 2; k++) {
yading@10:                 *output_samples++ = AV_RL16(buf + *t * 2);
yading@10:                 t++;
yading@10:             }
yading@10:         }
yading@10:         buf += PAF_SOUND_FRAME_SIZE;
yading@10:     }
yading@10: 
yading@10:     *got_frame_ptr   = 1;
yading@10: 
yading@10:     return pkt->size;
yading@10: }
yading@10: 
yading@10: AVCodec ff_paf_video_decoder = {
yading@10:     .name           = "paf_video",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_PAF_VIDEO,
yading@10:     .priv_data_size = sizeof(PAFVideoDecContext),
yading@10:     .init           = paf_vid_init,
yading@10:     .close          = paf_vid_close,
yading@10:     .decode         = paf_vid_decode,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Video"),
yading@10: };
yading@10: 
yading@10: AVCodec ff_paf_audio_decoder = {
yading@10:     .name           = "paf_audio",
yading@10:     .type           = AVMEDIA_TYPE_AUDIO,
yading@10:     .id             = AV_CODEC_ID_PAF_AUDIO,
yading@10:     .init           = paf_aud_init,
yading@10:     .decode         = paf_aud_decode,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Audio"),
yading@10: };