FFmpeg/libavcodec/motionpixels.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

317 lines
9.8 KiB
C

/*
* Motion Pixels Video Decoder
* Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
*
* 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 "avcodec.h"
#include "get_bits.h"
#include "dsputil.h"
#define MAX_HUFF_CODES 16
#include "motionpixels_tablegen.h"
typedef struct HuffCode {
int code;
uint8_t size;
uint8_t delta;
} HuffCode;
typedef struct MotionPixelsContext {
AVCodecContext *avctx;
AVFrame frame;
DSPContext dsp;
uint8_t *changes_map;
int offset_bits_len;
int codes_count, current_codes_count;
int max_codes_bits;
HuffCode codes[MAX_HUFF_CODES];
VLC vlc;
YuvPixel *vpt, *hpt;
uint8_t gradient_scale[3];
uint8_t *bswapbuf;
int bswapbuf_size;
} MotionPixelsContext;
static av_cold int mp_decode_init(AVCodecContext *avctx)
{
MotionPixelsContext *mp = avctx->priv_data;
motionpixels_tableinit();
mp->avctx = avctx;
dsputil_init(&mp->dsp, avctx);
mp->changes_map = av_mallocz(avctx->width * avctx->height);
mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel));
mp->hpt = av_mallocz(avctx->height * avctx->width / 16 * sizeof(YuvPixel));
avctx->pix_fmt = PIX_FMT_RGB555;
return 0;
}
static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
{
uint16_t *pixels;
int offset, w, h, color = 0, x, y, i;
while (count--) {
offset = get_bits_long(gb, mp->offset_bits_len);
w = get_bits(gb, bits_len) + 1;
h = get_bits(gb, bits_len) + 1;
if (read_color)
color = get_bits(gb, 15);
x = offset % mp->avctx->width;
y = offset / mp->avctx->width;
if (y >= mp->avctx->height)
continue;
w = FFMIN(w, mp->avctx->width - x);
h = FFMIN(h, mp->avctx->height - y);
pixels = (uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
while (h--) {
mp->changes_map[offset] = w;
if (read_color)
for (i = 0; i < w; ++i)
pixels[i] = color;
offset += mp->avctx->width;
pixels += mp->frame.linesize[0] / 2;
}
}
}
static void mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
{
while (get_bits1(gb)) {
++size;
if (size > mp->max_codes_bits) {
av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
return;
}
code <<= 1;
mp_get_code(mp, gb, size, code + 1);
}
if (mp->current_codes_count >= MAX_HUFF_CODES) {
av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
return;
}
mp->codes[mp->current_codes_count ].code = code;
mp->codes[mp->current_codes_count++].size = size;
}
static void mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
{
if (mp->codes_count == 1) {
mp->codes[0].delta = get_bits(gb, 4);
} else {
int i;
mp->max_codes_bits = get_bits(gb, 4);
for (i = 0; i < mp->codes_count; ++i)
mp->codes[i].delta = get_bits(gb, 4);
mp->current_codes_count = 0;
mp_get_code(mp, gb, 0, 0);
}
}
static int mp_gradient(MotionPixelsContext *mp, int component, int v)
{
int delta;
delta = (v - 7) * mp->gradient_scale[component];
mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
return delta;
}
static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
{
int color;
color = *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
return mp_rgb_yuv_table[color];
}
static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
{
int color;
color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
*(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2] = color;
}
static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
{
int i;
i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
return mp->codes[i].delta;
}
static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
{
YuvPixel p;
const int y0 = y * mp->avctx->width;
int w, i, x = 0;
p = mp->vpt[y];
if (mp->changes_map[y0 + x] == 0) {
memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
++x;
}
while (x < mp->avctx->width) {
w = mp->changes_map[y0 + x];
if (w != 0) {
if ((y & 3) == 0) {
if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
for (i = (x + 3) & ~3; i < x + w; i += 4) {
mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
}
}
}
x += w;
memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
p = mp_get_yuv_from_rgb(mp, x - 1, y);
} else {
p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
if ((x & 3) == 0) {
if ((y & 3) == 0) {
p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
} else {
p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
}
}
mp_set_rgb_from_yuv(mp, x, y, &p);
++x;
}
}
}
static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
{
YuvPixel p;
int y, y0;
for (y = 0; y < mp->avctx->height; ++y) {
if (mp->changes_map[y * mp->avctx->width] != 0) {
memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
p = mp_get_yuv_from_rgb(mp, 0, y);
} else {
p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
if ((y & 3) == 0) {
p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
}
mp->vpt[y] = p;
mp_set_rgb_from_yuv(mp, 0, y, &p);
}
}
for (y0 = 0; y0 < 2; ++y0)
for (y = y0; y < mp->avctx->height; y += 2)
mp_decode_line(mp, gb, y);
}
static int mp_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
MotionPixelsContext *mp = avctx->priv_data;
GetBitContext gb;
int i, count1, count2, sz;
mp->frame.reference = 1;
mp->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
if (avctx->reget_buffer(avctx, &mp->frame)) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return -1;
}
/* le32 bitstream msb first */
av_fast_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!mp->bswapbuf)
return AVERROR(ENOMEM);
mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4);
if (buf_size & 3)
memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
memset(mp->changes_map, 0, avctx->width * avctx->height);
for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
count1 = get_bits(&gb, 12);
count2 = get_bits(&gb, 12);
mp_read_changes_map(mp, &gb, count1, 8, i);
mp_read_changes_map(mp, &gb, count2, 4, i);
}
mp->codes_count = get_bits(&gb, 4);
if (mp->codes_count == 0)
goto end;
if (mp->changes_map[0] == 0) {
*(uint16_t *)mp->frame.data[0] = get_bits(&gb, 15);
mp->changes_map[0] = 1;
}
mp_read_codes_table(mp, &gb);
sz = get_bits(&gb, 18);
if (avctx->extradata[0] != 5)
sz += get_bits(&gb, 18);
if (sz == 0)
goto end;
init_vlc(&mp->vlc, mp->max_codes_bits, mp->codes_count, &mp->codes[0].size, sizeof(HuffCode), 1, &mp->codes[0].code, sizeof(HuffCode), 4, 0);
mp_decode_frame_helper(mp, &gb);
free_vlc(&mp->vlc);
end:
*data_size = sizeof(AVFrame);
*(AVFrame *)data = mp->frame;
return buf_size;
}
static av_cold int mp_decode_end(AVCodecContext *avctx)
{
MotionPixelsContext *mp = avctx->priv_data;
av_freep(&mp->changes_map);
av_freep(&mp->vpt);
av_freep(&mp->hpt);
av_freep(&mp->bswapbuf);
if (mp->frame.data[0])
avctx->release_buffer(avctx, &mp->frame);
return 0;
}
AVCodec motionpixels_decoder = {
"motionpixels",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_MOTIONPIXELS,
sizeof(MotionPixelsContext),
mp_decode_init,
NULL,
mp_decode_end,
mp_decode_frame,
CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
};