* This decoder does not support CGA palettes. I am unable to find samples
* and Netpbm cannot generate them.
*
- * 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
*/
+#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
-#include "bitstream.h"
-
-typedef struct PCXContext {
- AVFrame picture;
-} PCXContext;
-
-static av_cold int pcx_init(AVCodecContext *avctx) {
- PCXContext *s = avctx->priv_data;
-
- avcodec_get_frame_defaults(&s->picture);
- avctx->coded_frame= &s->picture;
-
- return 0;
-}
+#include "get_bits.h"
+#include "internal.h"
/**
* @return advanced src pointer
*/
-static const uint8_t *pcx_rle_decode(const uint8_t *src, uint8_t *dst,
- unsigned int bytes_per_scanline) {
+static const uint8_t *pcx_rle_decode(const uint8_t *src,
+ const uint8_t *end,
+ uint8_t *dst,
+ unsigned int bytes_per_scanline,
+ int compressed)
+{
unsigned int i = 0;
unsigned char run, value;
- while (i<bytes_per_scanline) {
- run = 1;
- value = *src++;
- if (value >= 0xc0) {
- run = value & 0x3f;
+ if (compressed) {
+ while (i < bytes_per_scanline && src < end) {
+ run = 1;
value = *src++;
+ if (value >= 0xc0 && src < end) {
+ run = value & 0x3f;
+ value = *src++;
+ }
+ while (i < bytes_per_scanline && run--)
+ dst[i++] = value;
}
- while (i<bytes_per_scanline && run--)
- dst[i++] = value;
+ } else {
+ memcpy(dst, src, bytes_per_scanline);
+ src += bytes_per_scanline;
}
return src;
}
-static void pcx_palette(const uint8_t **src, uint32_t *dst, unsigned int pallen) {
+static void pcx_palette(const uint8_t **src, uint32_t *dst,
+ unsigned int pallen)
+{
unsigned int i;
- for (i=0; i<pallen; i++)
+ for (i = 0; i < pallen; i++)
*dst++ = bytestream_get_be24(src);
- memset(dst, 0, (256 - pallen) * sizeof(*dst));
+ if (pallen < 256)
+ memset(dst, 0, (256 - pallen) * sizeof(*dst));
}
-static int pcx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
- AVPacket *avpkt) {
+static int pcx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+ AVPacket *avpkt)
+{
const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- PCXContext * const s = avctx->priv_data;
- AVFrame *picture = data;
- AVFrame * const p = &s->picture;
- int xmin, ymin, xmax, ymax;
+ int buf_size = avpkt->size;
+ AVFrame *const p = data;
+ int compressed, xmin, ymin, xmax, ymax;
unsigned int w, h, bits_per_pixel, bytes_per_line, nplanes, stride, y, x,
bytes_per_scanline;
uint8_t *ptr;
- uint8_t const *bufstart = buf;
+ const uint8_t *buf_end = buf + buf_size;
+ const uint8_t *bufstart = buf;
+ uint8_t *scanline;
+ int ret = -1;
- if (buf[0] != 0x0a || buf[1] > 5 || buf[1] == 1 || buf[2] != 1) {
+ if (buf[0] != 0x0a || buf[1] > 5) {
av_log(avctx, AV_LOG_ERROR, "this is not PCX encoded data\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
- xmin = AV_RL16(buf+ 4);
- ymin = AV_RL16(buf+ 6);
- xmax = AV_RL16(buf+ 8);
- ymax = AV_RL16(buf+10);
+ compressed = buf[2];
+ xmin = AV_RL16(buf + 4);
+ ymin = AV_RL16(buf + 6);
+ xmax = AV_RL16(buf + 8);
+ ymax = AV_RL16(buf + 10);
if (xmax < xmin || ymax < ymin) {
av_log(avctx, AV_LOG_ERROR, "invalid image dimensions\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
w = xmax - xmin + 1;
h = ymax - ymin + 1;
bits_per_pixel = buf[3];
- bytes_per_line = AV_RL16(buf+66);
+ bytes_per_line = AV_RL16(buf + 66);
nplanes = buf[65];
bytes_per_scanline = nplanes * bytes_per_line;
- if (bytes_per_scanline < w * bits_per_pixel * nplanes / 8) {
+ if (bytes_per_scanline < (w * bits_per_pixel * nplanes + 7) / 8 ||
+ (!compressed && bytes_per_scanline > buf_size / h)) {
av_log(avctx, AV_LOG_ERROR, "PCX data is corrupted\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
- switch ((nplanes<<8) + bits_per_pixel) {
- case 0x0308:
- avctx->pix_fmt = PIX_FMT_RGB24;
- break;
- case 0x0108:
- case 0x0104:
- case 0x0102:
- case 0x0101:
- case 0x0401:
- case 0x0301:
- case 0x0201:
- avctx->pix_fmt = PIX_FMT_PAL8;
- break;
- default:
- av_log(avctx, AV_LOG_ERROR, "invalid PCX file\n");
- return -1;
+ switch ((nplanes << 8) + bits_per_pixel) {
+ case 0x0308:
+ avctx->pix_fmt = AV_PIX_FMT_RGB24;
+ break;
+ case 0x0108:
+ case 0x0104:
+ case 0x0102:
+ case 0x0101:
+ case 0x0401:
+ case 0x0301:
+ case 0x0201:
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
+ break;
+ default:
+ av_log(avctx, AV_LOG_ERROR, "invalid PCX file\n");
+ return AVERROR_INVALIDDATA;
}
buf += 128;
- if (p->data[0])
- avctx->release_buffer(avctx, p);
+ if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
+ return ret;
- if (avcodec_check_dimensions(avctx, w, h))
- return -1;
- if (w != avctx->width || h != avctx->height)
- avcodec_set_dimensions(avctx, w, h);
- if (avctx->get_buffer(avctx, p) < 0) {
+ if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
- return -1;
+ return ret;
}
- p->pict_type = FF_I_TYPE;
+ p->pict_type = AV_PICTURE_TYPE_I;
ptr = p->data[0];
stride = p->linesize[0];
- if (nplanes == 3 && bits_per_pixel == 8) {
- uint8_t scanline[bytes_per_scanline];
-
- for (y=0; y<h; y++) {
- buf = pcx_rle_decode(buf, scanline, bytes_per_scanline);
+ scanline = av_malloc(bytes_per_scanline);
+ if (!scanline)
+ return AVERROR(ENOMEM);
- for (x=0; x<w; x++) {
- ptr[3*x ] = scanline[x ];
- ptr[3*x+1] = scanline[x+ bytes_per_line ];
- ptr[3*x+2] = scanline[x+(bytes_per_line<<1)];
+ if (nplanes == 3 && bits_per_pixel == 8) {
+ for (y = 0; y < h; y++) {
+ buf = pcx_rle_decode(buf, buf_end,
+ scanline, bytes_per_scanline, compressed);
+
+ for (x = 0; x < w; x++) {
+ ptr[3 * x] = scanline[x];
+ ptr[3 * x + 1] = scanline[x + bytes_per_line];
+ ptr[3 * x + 2] = scanline[x + (bytes_per_line << 1)];
}
ptr += stride;
}
-
} else if (nplanes == 1 && bits_per_pixel == 8) {
- uint8_t scanline[bytes_per_scanline];
const uint8_t *palstart = bufstart + buf_size - 769;
- for (y=0; y<h; y++, ptr+=stride) {
- buf = pcx_rle_decode(buf, scanline, bytes_per_scanline);
+ if (buf_size < 769) {
+ av_log(avctx, AV_LOG_ERROR, "File is too short\n");
+ ret = avctx->err_recognition & AV_EF_EXPLODE ?
+ AVERROR_INVALIDDATA : buf_size;
+ goto end;
+ }
+
+ for (y = 0; y < h; y++, ptr += stride) {
+ buf = pcx_rle_decode(buf, buf_end,
+ scanline, bytes_per_scanline, compressed);
memcpy(ptr, scanline, w);
}
}
if (*buf++ != 12) {
av_log(avctx, AV_LOG_ERROR, "expected palette after image data\n");
- return -1;
+ ret = avctx->err_recognition & AV_EF_EXPLODE ?
+ AVERROR_INVALIDDATA : buf_size;
+ goto end;
}
-
} else if (nplanes == 1) { /* all packed formats, max. 16 colors */
- uint8_t scanline[bytes_per_scanline];
GetBitContext s;
- for (y=0; y<h; y++) {
- init_get_bits(&s, scanline, bytes_per_scanline<<3);
+ for (y = 0; y < h; y++) {
+ init_get_bits(&s, scanline, bytes_per_scanline << 3);
- buf = pcx_rle_decode(buf, scanline, bytes_per_scanline);
+ buf = pcx_rle_decode(buf, buf_end,
+ scanline, bytes_per_scanline, compressed);
- for (x=0; x<w; x++)
+ for (x = 0; x < w; x++)
ptr[x] = get_bits(&s, bits_per_pixel);
ptr += stride;
}
-
} else { /* planar, 4, 8 or 16 colors */
- uint8_t scanline[bytes_per_scanline];
int i;
- for (y=0; y<h; y++) {
- buf = pcx_rle_decode(buf, scanline, bytes_per_scanline);
+ for (y = 0; y < h; y++) {
+ buf = pcx_rle_decode(buf, buf_end,
+ scanline, bytes_per_scanline, compressed);
- for (x=0; x<w; x++) {
- int m = 0x80 >> (x&7), v = 0;
- for (i=nplanes - 1; i>=0; i--) {
+ for (x = 0; x < w; x++) {
+ int m = 0x80 >> (x & 7), v = 0;
+ for (i = nplanes - 1; i >= 0; i--) {
v <<= 1;
- v += !!(scanline[i*bytes_per_line + (x>>3)] & m);
+ v += !!(scanline[i * bytes_per_line + (x >> 3)] & m);
}
ptr[x] = v;
}
}
if (nplanes == 1 && bits_per_pixel == 8) {
- pcx_palette(&buf, (uint32_t *) p->data[1], 256);
+ pcx_palette(&buf, (uint32_t *)p->data[1], 256);
} else if (bits_per_pixel < 8) {
- const uint8_t *palette = bufstart+16;
- pcx_palette(&palette, (uint32_t *) p->data[1], 16);
+ const uint8_t *palette = bufstart + 16;
+ pcx_palette(&palette, (uint32_t *)p->data[1], 16);
}
- *picture = s->picture;
- *data_size = sizeof(AVFrame);
-
- return buf - bufstart;
-}
-
-static av_cold int pcx_end(AVCodecContext *avctx) {
- PCXContext *s = avctx->priv_data;
-
- if(s->picture.data[0])
- avctx->release_buffer(avctx, &s->picture);
+ *got_frame = 1;
- return 0;
+ ret = buf - bufstart;
+end:
+ av_free(scanline);
+ return ret;
}
-AVCodec pcx_decoder = {
- "pcx",
- CODEC_TYPE_VIDEO,
- CODEC_ID_PCX,
- sizeof(PCXContext),
- pcx_init,
- NULL,
- pcx_end,
- pcx_decode_frame,
- 0,
- NULL,
- .long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),
+AVCodec ff_pcx_decoder = {
+ .name = "pcx",
+ .long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_PCX,
+ .decode = pcx_decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
};
projects / ffmpeg / blobdiff