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/*
* QPEG codec
* Copyright (c) 2004 Konstantin Shishkov
* |
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* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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/** |
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* @file |
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* QPEG codec.
*/ |
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|
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "internal.h" |
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typedef struct QpegContext{
AVCodecContext *avctx; |
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AVFrame *pic, *ref; |
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uint32_t pal[256]; |
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GetByteContext buffer; |
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} QpegContext;
|
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static void qpeg_decode_intra(QpegContext *qctx, uint8_t *dst,
int stride, int width, int height) |
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{
int i;
int code;
int c0, c1;
int run, copy;
int filled = 0; |
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int rows_to_go; |
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|
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rows_to_go = height; |
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height--;
dst = dst + height * stride; |
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|
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while ((bytestream2_get_bytes_left(&qctx->buffer) > 0) && (rows_to_go > 0)) {
code = bytestream2_get_byte(&qctx->buffer); |
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run = copy = 0;
if(code == 0xFC) /* end-of-picture code */
break;
if(code >= 0xF8) { /* very long run */ |
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c0 = bytestream2_get_byte(&qctx->buffer);
c1 = bytestream2_get_byte(&qctx->buffer); |
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run = ((code & 0x7) << 16) + (c0 << 8) + c1 + 2;
} else if (code >= 0xF0) { /* long run */ |
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c0 = bytestream2_get_byte(&qctx->buffer); |
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run = ((code & 0xF) << 8) + c0 + 2;
} else if (code >= 0xE0) { /* short run */
run = (code & 0x1F) + 2;
} else if (code >= 0xC0) { /* very long copy */ |
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c0 = bytestream2_get_byte(&qctx->buffer);
c1 = bytestream2_get_byte(&qctx->buffer); |
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copy = ((code & 0x3F) << 16) + (c0 << 8) + c1 + 1;
} else if (code >= 0x80) { /* long copy */ |
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c0 = bytestream2_get_byte(&qctx->buffer); |
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copy = ((code & 0x7F) << 8) + c0 + 1;
} else { /* short copy */
copy = code + 1;
} |
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|
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/* perform actual run or copy */
if(run) {
int p; |
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|
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p = bytestream2_get_byte(&qctx->buffer); |
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for(i = 0; i < run; i++) {
dst[filled++] = p;
if (filled >= width) {
filled = 0;
dst -= stride; |
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rows_to_go--;
if(rows_to_go <= 0)
break; |
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}
}
} else {
for(i = 0; i < copy; i++) { |
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dst[filled++] = bytestream2_get_byte(&qctx->buffer); |
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if (filled >= width) {
filled = 0;
dst -= stride; |
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rows_to_go--;
if(rows_to_go <= 0)
break; |
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}
}
} |
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}
}
|
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static const int qpeg_table_h[16] = |
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{ 0x00, 0x20, 0x20, 0x20, 0x18, 0x10, 0x10, 0x20, 0x10, 0x08, 0x18, 0x08, 0x08, 0x18, 0x10, 0x04}; |
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static const int qpeg_table_w[16] = |
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{ 0x00, 0x20, 0x18, 0x08, 0x18, 0x10, 0x20, 0x10, 0x08, 0x10, 0x20, 0x20, 0x08, 0x10, 0x18, 0x04}; |
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|
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/* Decodes delta frames */ |
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static void av_noinline qpeg_decode_inter(QpegContext *qctx, uint8_t *dst, |
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int stride, int width, int height,
int delta, const uint8_t *ctable,
uint8_t *refdata) |
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{
int i, j;
int code;
int filled = 0; |
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int orig_height; |
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|
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if (refdata) {
/* copy prev frame */
for (i = 0; i < height; i++)
memcpy(dst + (i * stride), refdata + (i * stride), width);
} else {
refdata = dst;
} |
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|
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orig_height = height; |
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height--;
dst = dst + height * stride;
|
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while ((bytestream2_get_bytes_left(&qctx->buffer) > 0) && (height >= 0)) {
code = bytestream2_get_byte(&qctx->buffer); |
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|
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if(delta) {
/* motion compensation */ |
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while(bytestream2_get_bytes_left(&qctx->buffer) > 0 && (code & 0xF0) == 0xF0) { |
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if(delta == 1) {
int me_idx;
int me_w, me_h, me_x, me_y;
uint8_t *me_plane;
int corr, val; |
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|
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/* get block size by index */
me_idx = code & 0xF;
me_w = qpeg_table_w[me_idx];
me_h = qpeg_table_h[me_idx]; |
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|
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/* extract motion vector */ |
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corr = bytestream2_get_byte(&qctx->buffer); |
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|
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val = corr >> 4;
if(val > 7)
val -= 16;
me_x = val; |
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|
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val = corr & 0xF;
if(val > 7)
val -= 16;
me_y = val; |
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|
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/* check motion vector */
if ((me_x + filled < 0) || (me_x + me_w + filled > width) || |
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(height - me_y - me_h < 0) || (height - me_y >= orig_height) || |
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(filled + me_w > width) || (height - me_h < 0)) |
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av_log(qctx->avctx, AV_LOG_ERROR, "Bogus motion vector (%i,%i), block size %ix%i at %i,%i\n", |
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me_x, me_y, me_w, me_h, filled, height);
else {
/* do motion compensation */ |
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me_plane = refdata + (filled + me_x) + (height - me_y) * stride; |
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for(j = 0; j < me_h; j++) {
for(i = 0; i < me_w; i++) |
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dst[filled + i - (j * stride)] = me_plane[i - (j * stride)]; |
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} |
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}
} |
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code = bytestream2_get_byte(&qctx->buffer); |
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}
} |
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|
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if(code == 0xE0) /* end-of-picture code */
break;
if(code > 0xE0) { /* run code: 0xE1..0xFF */
int p; |
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|
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code &= 0x1F; |
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p = bytestream2_get_byte(&qctx->buffer); |
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for(i = 0; i <= code; i++) {
dst[filled++] = p;
if(filled >= width) {
filled = 0;
dst -= stride;
height--; |
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if (height < 0) |
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break; |
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}
}
} else if(code >= 0xC0) { /* copy code: 0xC0..0xDF */
code &= 0x1F; |
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|
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if(code + 1 > bytestream2_get_bytes_left(&qctx->buffer)) |
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break;
|
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for(i = 0; i <= code; i++) { |
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dst[filled++] = bytestream2_get_byte(&qctx->buffer); |
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if(filled >= width) {
filled = 0;
dst -= stride;
height--; |
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if (height < 0) |
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break; |
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}
}
} else if(code >= 0x80) { /* skip code: 0x80..0xBF */
int skip; |
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|
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code &= 0x3F;
/* codes 0x80 and 0x81 are actually escape codes,
skip value minus constant is in the next byte */
if(!code) |
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skip = bytestream2_get_byte(&qctx->buffer) + 64; |
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else if(code == 1) |
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skip = bytestream2_get_byte(&qctx->buffer) + 320; |
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else
skip = code;
filled += skip;
while( filled >= width) {
filled -= width;
dst -= stride;
height--; |
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if(height < 0)
break; |
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}
} else {
/* zero code treated as one-pixel skip */ |
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if(code) { |
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dst[filled++] = ctable[code & 0x7F]; |
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} |
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else
filled++;
if(filled >= width) {
filled = 0;
dst -= stride;
height--;
}
} |
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}
}
|
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static int decode_frame(AVCodecContext *avctx, |
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void *data, int *got_frame, |
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AVPacket *avpkt) |
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{ |
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uint8_t ctable[128]; |
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QpegContext * const a = avctx->priv_data; |
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AVFrame * const p = a->pic; |
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AVFrame * const ref = a->ref; |
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uint8_t* outdata; |
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int delta, ret; |
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int pal_size;
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &pal_size); |
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|
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if (avpkt->size < 0x86) {
av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
return AVERROR_INVALIDDATA;
}
bytestream2_init(&a->buffer, avpkt->data, avpkt->size); |
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|
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av_frame_unref(ref);
av_frame_move_ref(ref, p); |
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|
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if ((ret = ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF)) < 0) |
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return ret; |
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outdata = p->data[0]; |
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bytestream2_skip(&a->buffer, 4);
bytestream2_get_buffer(&a->buffer, ctable, 128);
bytestream2_skip(&a->buffer, 1);
delta = bytestream2_get_byte(&a->buffer);
if(delta == 0x10) { |
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qpeg_decode_intra(a, outdata, p->linesize[0], avctx->width, avctx->height); |
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} else { |
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qpeg_decode_inter(a, outdata, p->linesize[0], avctx->width, avctx->height, delta, ctable, ref->data[0]); |
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}
/* make the palette available on the way out */ |
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if (pal && pal_size == AVPALETTE_SIZE) { |
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p->palette_has_changed = 1; |
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memcpy(a->pal, pal, AVPALETTE_SIZE); |
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} else if (pal) {
av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", pal_size); |
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} |
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memcpy(p->data[1], a->pal, AVPALETTE_SIZE); |
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|
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if ((ret = av_frame_ref(data, p)) < 0) |
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return ret;
|
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*got_frame = 1; |
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|
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return avpkt->size; |
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}
|
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static void decode_flush(AVCodecContext *avctx){
QpegContext * const a = avctx->priv_data;
int i, pal_size;
const uint8_t *pal_src;
pal_size = FFMIN(1024U, avctx->extradata_size);
pal_src = avctx->extradata + avctx->extradata_size - pal_size;
for (i=0; i<pal_size/4; i++)
a->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
}
|
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static av_cold int decode_end(AVCodecContext *avctx)
{ |
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QpegContext * const a = avctx->priv_data; |
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|
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av_frame_free(&a->pic); |
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av_frame_free(&a->ref); |
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|
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return 0;
}
|
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static av_cold int decode_init(AVCodecContext *avctx){ |
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QpegContext * const a = avctx->priv_data; |
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|
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a->avctx = avctx; |
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avctx->pix_fmt= AV_PIX_FMT_PAL8; |
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|
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decode_flush(avctx);
|
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a->pic = av_frame_alloc(); |
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a->ref = av_frame_alloc();
if (!a->pic || !a->ref) { |
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decode_end(avctx);
return AVERROR(ENOMEM);
} |
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return 0;
}
|
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AVCodec ff_qpeg_decoder = { |
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.name = "qpeg", |
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.long_name = NULL_IF_CONFIG_SMALL("Q-team QPEG"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_QPEG, |
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.priv_data_size = sizeof(QpegContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame, |
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.flush = decode_flush, |
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.capabilities = AV_CODEC_CAP_DR1, |
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}; |