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|---|
| /* |
| * 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/paf.h" |
| #include "bytestream.h" |
| #include "avcodec.h" |
| #include "copy_block.h" |
| #include "internal.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_close(AVCodecContext *avctx) |
| { |
| PAFVideoDecContext *c = avctx->priv_data; |
| int i; |
| |
| av_frame_free(&c->pic); |
| |
| for (i = 0; i < 4; i++) |
| av_freep(&c->frame[i]); |
| |
| return 0; |
| } |
| |
| 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 = AV_PIX_FMT_PAL8; |
| |
| c->pic = av_frame_alloc(); |
| if (!c->pic) |
| return AVERROR(ENOMEM); |
| |
| 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]) { |
| paf_vid_close(avctx); |
| 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]; |
| dend = c->frame[c->current_frame] + c->frame_size; |
| 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) || |
| (dst + 3 * avctx->width + 4 > dend)) |
| 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 *got_frame, AVPacket *pkt) |
| { |
| PAFVideoDecContext *c = avctx->priv_data; |
| uint8_t code, *dst, *src, *end; |
| int i, frame, ret; |
| |
| if ((ret = ff_reget_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 > 256) |
| return AVERROR_INVALIDDATA; |
| if (bytestream2_get_bytes_left(&c->gb) < 3*count) |
| 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: |
| avpriv_request_sample(avctx, "unknown/invalid code"); |
| 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; |
| if ((ret = av_frame_ref(data, c->pic)) < 0) |
| return ret; |
| |
| *got_frame = 1; |
| |
| return pkt->size; |
| } |
| |
| static av_cold int paf_aud_init(AVCodecContext *avctx) |
| { |
| if (avctx->channels != 2) { |
| av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| avctx->channel_layout = AV_CH_LAYOUT_STEREO; |
| avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
| |
| return 0; |
| } |
| |
| static int paf_aud_decode(AVCodecContext *avctx, void *data, |
| int *got_frame_ptr, AVPacket *pkt) |
| { |
| AVFrame *frame = 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; |
| |
| frame->nb_samples = PAF_SOUND_SAMPLES * frames; |
| if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| return ret; |
| |
| output_samples = (int16_t *)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); |
| t++; |
| } |
| } |
| buf += PAF_SOUND_FRAME_SIZE; |
| } |
| |
| *got_frame_ptr = 1; |
| |
| return pkt->size; |
| } |
| |
| AVCodec ff_paf_video_decoder = { |
| .name = "paf_video", |
| .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Video"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_PAF_VIDEO, |
| .priv_data_size = sizeof(PAFVideoDecContext), |
| .init = paf_vid_init, |
| .close = paf_vid_close, |
| .decode = paf_vid_decode, |
| .capabilities = CODEC_CAP_DR1, |
| }; |
| |
| AVCodec ff_paf_audio_decoder = { |
| .name = "paf_audio", |
| .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Audio"), |
| .type = AVMEDIA_TYPE_AUDIO, |
| .id = AV_CODEC_ID_PAF_AUDIO, |
| .init = paf_aud_init, |
| .decode = paf_aud_decode, |
| .capabilities = CODEC_CAP_DR1, |
| }; |