* QPEG codec
* Copyright (c) 2004 Konstantin Shishkov
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavcodec/qpeg.c
+ * @file
* QPEG codec.
*/
#include "avcodec.h"
+#include "bytestream.h"
typedef struct QpegContext{
AVCodecContext *avctx;
AVFrame pic;
uint8_t *refdata;
+ uint32_t pal[256];
+ GetByteContext buffer;
} QpegContext;
-static void qpeg_decode_intra(const uint8_t *src, uint8_t *dst, int size,
- int stride, int width, int height)
+static void qpeg_decode_intra(QpegContext *qctx, uint8_t *dst,
+ int stride, int width, int height)
{
int i;
int code;
height--;
dst = dst + height * stride;
- while((size > 0) && (rows_to_go > 0)) {
- code = *src++;
- size--;
+ while ((bytestream2_get_bytes_left(&qctx->buffer) > 0) && (rows_to_go > 0)) {
+ code = bytestream2_get_byte(&qctx->buffer);
run = copy = 0;
if(code == 0xFC) /* end-of-picture code */
break;
if(code >= 0xF8) { /* very long run */
- c0 = *src++;
- c1 = *src++;
- size -= 2;
+ c0 = bytestream2_get_byte(&qctx->buffer);
+ c1 = bytestream2_get_byte(&qctx->buffer);
run = ((code & 0x7) << 16) + (c0 << 8) + c1 + 2;
} else if (code >= 0xF0) { /* long run */
- c0 = *src++;
- size--;
+ c0 = bytestream2_get_byte(&qctx->buffer);
run = ((code & 0xF) << 8) + c0 + 2;
} else if (code >= 0xE0) { /* short run */
run = (code & 0x1F) + 2;
} else if (code >= 0xC0) { /* very long copy */
- c0 = *src++;
- c1 = *src++;
- size -= 2;
+ c0 = bytestream2_get_byte(&qctx->buffer);
+ c1 = bytestream2_get_byte(&qctx->buffer);
copy = ((code & 0x3F) << 16) + (c0 << 8) + c1 + 1;
} else if (code >= 0x80) { /* long copy */
- c0 = *src++;
- size--;
+ c0 = bytestream2_get_byte(&qctx->buffer);
copy = ((code & 0x7F) << 8) + c0 + 1;
} else { /* short copy */
copy = code + 1;
if(run) {
int p;
- p = *src++;
- size--;
+ p = bytestream2_get_byte(&qctx->buffer);
for(i = 0; i < run; i++) {
dst[filled++] = p;
if (filled >= width) {
}
}
} else {
- size -= copy;
for(i = 0; i < copy; i++) {
- dst[filled++] = *src++;
+ dst[filled++] = bytestream2_get_byte(&qctx->buffer);
if (filled >= width) {
filled = 0;
dst -= stride;
{ 0x00, 0x20, 0x18, 0x08, 0x18, 0x10, 0x20, 0x10, 0x08, 0x10, 0x20, 0x20, 0x08, 0x10, 0x18, 0x04};
/* Decodes delta frames */
-static void qpeg_decode_inter(const uint8_t *src, uint8_t *dst, int size,
- int stride, int width, int height,
- int delta, const uint8_t *ctable, uint8_t *refdata)
+static void qpeg_decode_inter(QpegContext *qctx, uint8_t *dst,
+ int stride, int width, int height,
+ int delta, const uint8_t *ctable,
+ uint8_t *refdata)
{
int i, j;
int code;
height--;
dst = dst + height * stride;
- while((size > 0) && (height >= 0)) {
- code = *src++;
- size--;
+ while ((bytestream2_get_bytes_left(&qctx->buffer) > 0) && (height >= 0)) {
+ code = bytestream2_get_byte(&qctx->buffer);
if(delta) {
/* motion compensation */
me_h = qpeg_table_h[me_idx];
/* extract motion vector */
- corr = *src++;
- size--;
+ corr = bytestream2_get_byte(&qctx->buffer);
val = corr >> 4;
if(val > 7)
}
}
}
- code = *src++;
- size--;
+ code = bytestream2_get_byte(&qctx->buffer);
}
}
int p;
code &= 0x1F;
- p = *src++;
- size--;
+ p = bytestream2_get_byte(&qctx->buffer);
for(i = 0; i <= code; i++) {
dst[filled++] = p;
if(filled >= width) {
code &= 0x1F;
for(i = 0; i <= code; i++) {
- dst[filled++] = *src++;
+ dst[filled++] = bytestream2_get_byte(&qctx->buffer);
if(filled >= width) {
filled = 0;
dst -= stride;
height--;
}
}
- size -= code + 1;
} else if(code >= 0x80) { /* skip code: 0x80..0xBF */
int skip;
/* codes 0x80 and 0x81 are actually escape codes,
skip value minus constant is in the next byte */
if(!code)
- skip = (*src++) + 64;
+ skip = bytestream2_get_byte(&qctx->buffer) + 64;
else if(code == 1)
- skip = (*src++) + 320;
+ skip = bytestream2_get_byte(&qctx->buffer) + 320;
else
skip = code;
filled += skip;
}
} else {
/* zero code treated as one-pixel skip */
- if(code)
+ if(code) {
dst[filled++] = ctable[code & 0x7F];
+ }
else
filled++;
if(filled >= width) {
static int decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- const uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
+ uint8_t ctable[128];
QpegContext * const a = avctx->priv_data;
- AVFrame * const p= (AVFrame*)&a->pic;
+ AVFrame * const p = &a->pic;
uint8_t* outdata;
int delta;
+ const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
- if(p->data[0])
- avctx->release_buffer(avctx, p);
+ if (avpkt->size < 0x86) {
+ av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
+ return AVERROR_INVALIDDATA;
+ }
- p->reference= 0;
- if(avctx->get_buffer(avctx, p) < 0){
- av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ bytestream2_init(&a->buffer, avpkt->data, avpkt->size);
+ p->reference = 3;
+ if (avctx->reget_buffer(avctx, p) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return -1;
}
outdata = a->pic.data[0];
- if(buf[0x85] == 0x10) {
- qpeg_decode_intra(buf+0x86, outdata, buf_size - 0x86, a->pic.linesize[0], avctx->width, avctx->height);
+ 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) {
+ qpeg_decode_intra(a, outdata, a->pic.linesize[0], avctx->width, avctx->height);
} else {
- delta = buf[0x85];
- qpeg_decode_inter(buf+0x86, outdata, buf_size - 0x86, a->pic.linesize[0], avctx->width, avctx->height, delta, buf + 4, a->refdata);
+ qpeg_decode_inter(a, outdata, a->pic.linesize[0], avctx->width, avctx->height, delta, ctable, a->refdata);
}
/* make the palette available on the way out */
- memcpy(a->pic.data[1], a->avctx->palctrl->palette, AVPALETTE_SIZE);
- if (a->avctx->palctrl->palette_changed) {
+ if (pal) {
a->pic.palette_has_changed = 1;
- a->avctx->palctrl->palette_changed = 0;
+ memcpy(a->pal, pal, AVPALETTE_SIZE);
}
+ memcpy(a->pic.data[1], a->pal, AVPALETTE_SIZE);
*data_size = sizeof(AVFrame);
*(AVFrame*)data = a->pic;
- return buf_size;
+ return avpkt->size;
}
static av_cold int decode_init(AVCodecContext *avctx){
QpegContext * const a = avctx->priv_data;
a->avctx = avctx;
- avctx->pix_fmt= PIX_FMT_PAL8;
- a->pic.data[0] = NULL;
+ avctx->pix_fmt= AV_PIX_FMT_PAL8;
a->refdata = av_malloc(avctx->width * avctx->height);
return 0;
static av_cold int decode_end(AVCodecContext *avctx){
QpegContext * const a = avctx->priv_data;
- AVFrame * const p= (AVFrame*)&a->pic;
+ AVFrame * const p = &a->pic;
if(p->data[0])
avctx->release_buffer(avctx, p);
return 0;
}
-AVCodec qpeg_decoder = {
- "qpeg",
- CODEC_TYPE_VIDEO,
- CODEC_ID_QPEG,
- sizeof(QpegContext),
- decode_init,
- NULL,
- decode_end,
- decode_frame,
- CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("Q-team QPEG"),
+AVCodec ff_qpeg_decoder = {
+ .name = "qpeg",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_QPEG,
+ .priv_data_size = sizeof(QpegContext),
+ .init = decode_init,
+ .close = decode_end,
+ .decode = decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Q-team QPEG"),
};
projects / ffmpeg / blobdiff