* Interplay C93 video decoder
* Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com>
*
- * 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
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
- * MA 02110-1301 USA
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
#include "bytestream.h"
+#include "internal.h"
-typedef struct {
- AVFrame pictures[2];
+typedef struct C93DecoderContext {
+ AVFrame *pictures[2];
int currentpic;
} C93DecoderContext;
#define C93_HAS_PALETTE 0x01
#define C93_FIRST_FRAME 0x02
-static int decode_init(AVCodecContext *avctx)
+static av_cold int decode_end(AVCodecContext *avctx)
{
- avctx->pix_fmt = PIX_FMT_PAL8;
+ C93DecoderContext * const c93 = avctx->priv_data;
+
+ av_frame_free(&c93->pictures[0]);
+ av_frame_free(&c93->pictures[1]);
+
return 0;
}
-static int decode_end(AVCodecContext *avctx)
+static av_cold int decode_init(AVCodecContext *avctx)
{
- C93DecoderContext * const c93 = avctx->priv_data;
+ C93DecoderContext *s = avctx->priv_data;
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
+
+ s->pictures[0] = av_frame_alloc();
+ s->pictures[1] = av_frame_alloc();
+ if (!s->pictures[0] || !s->pictures[1]) {
+ decode_end(avctx);
+ return AVERROR(ENOMEM);
+ }
- if (c93->pictures[0].data[0])
- avctx->release_buffer(avctx, &c93->pictures[0]);
- if (c93->pictures[1].data[0])
- avctx->release_buffer(avctx, &c93->pictures[1]);
return 0;
}
if (from_y + height > HEIGHT) {
av_log(avctx, AV_LOG_ERROR, "invalid offset %d during C93 decoding\n",
offset);
- return -1;
+ return AVERROR_INVALIDDATA;
}
if (overflow > 0) {
}
static int decode_frame(AVCodecContext *avctx, void *data,
- int *data_size, uint8_t * buf, int buf_size)
+ int *got_frame, AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
C93DecoderContext * const c93 = avctx->priv_data;
- AVFrame * const newpic = &c93->pictures[c93->currentpic];
- AVFrame * const oldpic = &c93->pictures[c93->currentpic^1];
- AVFrame *picture = data;
+ AVFrame * const newpic = c93->pictures[c93->currentpic];
+ AVFrame * const oldpic = c93->pictures[c93->currentpic^1];
+ GetByteContext gb;
uint8_t *out;
- int stride, i, x, y;
- C93BlockType bt = 0;
+ int stride, ret, i, x, y, b, bt = 0;
c93->currentpic ^= 1;
- newpic->reference = 1;
- newpic->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE |
- FF_BUFFER_HINTS_REUSABLE | FF_BUFFER_HINTS_READABLE;
- if (avctx->reget_buffer(avctx, newpic)) {
+ if ((ret = ff_reget_buffer(avctx, newpic)) < 0) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
- return -1;
+ return ret;
}
stride = newpic->linesize[0];
- if (buf[0] & C93_FIRST_FRAME) {
- newpic->pict_type = FF_I_TYPE;
+ bytestream2_init(&gb, buf, buf_size);
+ b = bytestream2_get_byte(&gb);
+ if (b & C93_FIRST_FRAME) {
+ newpic->pict_type = AV_PICTURE_TYPE_I;
newpic->key_frame = 1;
} else {
- newpic->pict_type = FF_P_TYPE;
+ newpic->pict_type = AV_PICTURE_TYPE_P;
newpic->key_frame = 0;
}
- if (*buf++ & C93_HAS_PALETTE) {
- uint32_t *palette = (uint32_t *) newpic->data[1];
- uint8_t *palbuf = buf + buf_size - 768 - 1;
- for (i = 0; i < 256; i++) {
- palette[i] = bytestream_get_be24(&palbuf);
- }
- } else {
- if (oldpic->data[1])
- memcpy(newpic->data[1], oldpic->data[1], 256 * 4);
- }
-
for (y = 0; y < HEIGHT; y += 8) {
out = newpic->data[0] + y * stride;
for (x = 0; x < WIDTH; x += 8) {
uint8_t *copy_from = oldpic->data[0];
unsigned int offset, j;
uint8_t cols[4], grps[4];
+ C93BlockType block_type;
if (!bt)
- bt = *buf++;
+ bt = bytestream2_get_byte(&gb);
- switch (bt & 0x0F) {
+ block_type= bt & 0x0F;
+ switch (block_type) {
case C93_8X8_FROM_PREV:
- offset = bytestream_get_le16(&buf);
- if (copy_block(avctx, out, copy_from, offset, 8, stride))
- return -1;
+ offset = bytestream2_get_le16(&gb);
+ if ((ret = copy_block(avctx, out, copy_from, offset, 8, stride)) < 0)
+ return ret;
break;
case C93_4X4_FROM_CURR:
case C93_4X4_FROM_PREV:
for (j = 0; j < 8; j += 4) {
for (i = 0; i < 8; i += 4) {
- offset = bytestream_get_le16(&buf);
- if (copy_block(avctx, &out[j*stride+i],
- copy_from, offset, 4, stride))
- return -1;
+ offset = bytestream2_get_le16(&gb);
+ if ((ret = copy_block(avctx, &out[j*stride+i],
+ copy_from, offset, 4, stride)) < 0)
+ return ret;
}
}
break;
case C93_8X8_2COLOR:
- bytestream_get_buffer(&buf, cols, 2);
+ bytestream2_get_buffer(&gb, cols, 2);
for (i = 0; i < 8; i++) {
draw_n_color(out + i*stride, stride, 8, 1, 1, cols,
- NULL, *buf++);
+ NULL, bytestream2_get_byte(&gb));
}
break;
case C93_4X4_4COLOR_GRP:
for (j = 0; j < 8; j += 4) {
for (i = 0; i < 8; i += 4) {
- if ((bt & 0x0F) == C93_4X4_2COLOR) {
- bytestream_get_buffer(&buf, cols, 2);
+ if (block_type == C93_4X4_2COLOR) {
+ bytestream2_get_buffer(&gb, cols, 2);
draw_n_color(out + i + j*stride, stride, 4, 4,
- 1, cols, NULL, bytestream_get_le16(&buf));
- } else if ((bt & 0x0F) == C93_4X4_4COLOR) {
- bytestream_get_buffer(&buf, cols, 4);
+ 1, cols, NULL, bytestream2_get_le16(&gb));
+ } else if (block_type == C93_4X4_4COLOR) {
+ bytestream2_get_buffer(&gb, cols, 4);
draw_n_color(out + i + j*stride, stride, 4, 4,
- 2, cols, NULL, bytestream_get_le32(&buf));
+ 2, cols, NULL, bytestream2_get_le32(&gb));
} else {
- bytestream_get_buffer(&buf, grps, 4);
+ bytestream2_get_buffer(&gb, grps, 4);
draw_n_color(out + i + j*stride, stride, 4, 4,
- 1, cols, grps, bytestream_get_le16(&buf));
+ 1, cols, grps, bytestream2_get_le16(&gb));
}
}
}
case C93_8X8_INTRA:
for (j = 0; j < 8; j++)
- bytestream_get_buffer(&buf, out + j*stride, 8);
+ bytestream2_get_buffer(&gb, out + j*stride, 8);
break;
default:
av_log(avctx, AV_LOG_ERROR, "unexpected type %x at %dx%d\n",
- bt & 0x0F, x, y);
- return -1;
+ block_type, x, y);
+ return AVERROR_INVALIDDATA;
}
bt >>= 4;
out += 8;
}
}
- *picture = *newpic;
- *data_size = sizeof(AVFrame);
+ if (b & C93_HAS_PALETTE) {
+ uint32_t *palette = (uint32_t *) newpic->data[1];
+ for (i = 0; i < 256; i++) {
+ palette[i] = bytestream2_get_be24(&gb);
+ }
+ newpic->palette_has_changed = 1;
+ } else {
+ if (oldpic->data[1])
+ memcpy(newpic->data[1], oldpic->data[1], 256 * 4);
+ }
+
+ if ((ret = av_frame_ref(data, newpic)) < 0)
+ return ret;
+ *got_frame = 1;
return buf_size;
}
-AVCodec c93_decoder = {
- "c93",
- CODEC_TYPE_VIDEO,
- CODEC_ID_C93,
- sizeof(C93DecoderContext),
- decode_init,
- NULL,
- decode_end,
- decode_frame,
- CODEC_CAP_DR1,
+AVCodec ff_c93_decoder = {
+ .name = "c93",
+ .long_name = NULL_IF_CONFIG_SMALL("Interplay C93"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_C93,
+ .priv_data_size = sizeof(C93DecoderContext),
+ .init = decode_init,
+ .close = decode_end,
+ .decode = decode_frame,
+ .capabilities = CODEC_CAP_DR1,
};
projects / ffmpeg / blobdiff