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FFmpeg/libavcodec/paf.c
Paul B Mahol 2cced2a854 paf: decode directly to the user-provided AVFrame 
Signed-off-by: Paul B Mahol <onemda@gmail.com>
2013-02-13 12:33:48 +00:00

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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_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;
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];
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;
c->pic.reference = 3;
if ((ret = avctx->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:
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;
*got_frame = 1;
*(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;
}
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)
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",
.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,
.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 = AV_CODEC_ID_PAF_AUDIO,
.init = paf_aud_init,
.decode = paf_aud_decode,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Audio"),
};
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