* Interplay MVE Video Decoder
* Copyright (C) 2003 the ffmpeg project
*
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file roqvideo.c
- * Interplay MVE Video Decoder by Mike Melanson
+ * @file libavcodec/interplayvideo.c
+ * Interplay MVE Video Decoder by Mike Melanson (melanson@pcisys.net)
* For more information about the Interplay MVE format, visit:
- * http://www.pcisys.net/~melanson/codecs/
+ * http://www.pcisys.net/~melanson/codecs/interplay-mve.txt
+ * This code is written in such a way that the identifiers match up
+ * with the encoding descriptions in the document.
+ *
+ * This decoder presently only supports a PAL8 output colorspace.
+ *
+ * An Interplay video frame consists of 2 parts: The decoding map and
+ * the video data. A demuxer must load these 2 parts together in a single
+ * buffer before sending it through the stream to this decoder.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <unistd.h>
-#include "common.h"
#include "avcodec.h"
+#include "bytestream.h"
#include "dsputil.h"
+#define ALT_BITSTREAM_READER_LE
+#include "get_bits.h"
+
+#define PALETTE_COUNT 256
+
+/* debugging support */
+#define DEBUG_INTERPLAY 0
+#if DEBUG_INTERPLAY
+#define debug_interplay(x,...) av_log(NULL, AV_LOG_DEBUG, x, __VA_ARGS__)
+#else
+static inline void debug_interplay(const char *format, ...) { }
+#endif
typedef struct IpvideoContext {
AVCodecContext *avctx;
DSPContext dsp;
+ AVFrame second_last_frame;
AVFrame last_frame;
AVFrame current_frame;
- int first_frame;
- int receiving_decoding_map;
- unsigned char *decoding_map;
+ const unsigned char *decoding_map;
int decoding_map_size;
- unsigned char *buf;
+ const unsigned char *buf;
int size;
+ const unsigned char *stream_ptr;
+ const unsigned char *stream_end;
+ unsigned char *pixel_ptr;
+ int line_inc;
+ int stride;
+ int upper_motion_limit_offset;
+
} IpvideoContext;
-static int ipvideo_decode_init(AVCodecContext *avctx)
+#define CHECK_STREAM_PTR(n) \
+ if (s->stream_end - s->stream_ptr < n) { \
+ av_log(s->avctx, AV_LOG_ERROR, "Interplay video warning: stream_ptr out of bounds (%p >= %p)\n", \
+ s->stream_ptr + n, s->stream_end); \
+ return -1; \
+ }
+
+static int copy_from(IpvideoContext *s, AVFrame *src, int delta_x, int delta_y)
+{
+ int current_offset = s->pixel_ptr - s->current_frame.data[0];
+ int motion_offset = current_offset + delta_y * s->stride + delta_x;
+ if (motion_offset < 0) {
+ av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset);
+ return -1;
+ } else if (motion_offset > s->upper_motion_limit_offset) {
+ av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n",
+ motion_offset, s->upper_motion_limit_offset);
+ return -1;
+ }
+ s->dsp.put_pixels_tab[1][0](s->pixel_ptr, src->data[0] + motion_offset, s->stride, 8);
+ return 0;
+}
+
+static int ipvideo_decode_block_opcode_0x0(IpvideoContext *s)
+{
+ return copy_from(s, &s->last_frame, 0, 0);
+}
+
+static int ipvideo_decode_block_opcode_0x1(IpvideoContext *s)
+{
+ return copy_from(s, &s->second_last_frame, 0, 0);
+}
+
+static int ipvideo_decode_block_opcode_0x2(IpvideoContext *s)
+{
+ unsigned char B;
+ int x, y;
+
+ /* copy block from 2 frames ago using a motion vector; need 1 more byte */
+ CHECK_STREAM_PTR(1);
+ B = *s->stream_ptr++;
+
+ if (B < 56) {
+ x = 8 + (B % 7);
+ y = B / 7;
+ } else {
+ x = -14 + ((B - 56) % 29);
+ y = 8 + ((B - 56) / 29);
+ }
+
+ debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
+ return copy_from(s, &s->second_last_frame, x, y);
+}
+
+static int ipvideo_decode_block_opcode_0x3(IpvideoContext *s)
+{
+ unsigned char B;
+ int x, y;
+
+ /* copy 8x8 block from current frame from an up/left block */
+
+ /* need 1 more byte for motion */
+ CHECK_STREAM_PTR(1);
+ B = *s->stream_ptr++;
+
+ if (B < 56) {
+ x = -(8 + (B % 7));
+ y = -(B / 7);
+ } else {
+ x = -(-14 + ((B - 56) % 29));
+ y = -( 8 + ((B - 56) / 29));
+ }
+
+ debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
+ return copy_from(s, &s->current_frame, x, y);
+}
+
+static int ipvideo_decode_block_opcode_0x4(IpvideoContext *s)
+{
+ int x, y;
+ unsigned char B, BL, BH;
+
+ /* copy a block from the previous frame; need 1 more byte */
+ CHECK_STREAM_PTR(1);
+
+ B = *s->stream_ptr++;
+ BL = B & 0x0F;
+ BH = (B >> 4) & 0x0F;
+ x = -8 + BL;
+ y = -8 + BH;
+
+ debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
+ return copy_from(s, &s->last_frame, x, y);
+}
+
+static int ipvideo_decode_block_opcode_0x5(IpvideoContext *s)
+{
+ signed char x, y;
+
+ /* copy a block from the previous frame using an expanded range;
+ * need 2 more bytes */
+ CHECK_STREAM_PTR(2);
+
+ x = *s->stream_ptr++;
+ y = *s->stream_ptr++;
+
+ debug_interplay (" motion bytes = %d, %d\n", x, y);
+ return copy_from(s, &s->last_frame, x, y);
+}
+
+static int ipvideo_decode_block_opcode_0x6(IpvideoContext *s)
+{
+ /* mystery opcode? skip multiple blocks? */
+ av_log(s->avctx, AV_LOG_ERROR, " Interplay video: Help! Mystery opcode 0x6 seen\n");
+
+ /* report success */
+ return 0;
+}
+
+static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s)
+{
+ int x, y;
+ unsigned char P[2];
+ unsigned int flags;
+
+ /* 2-color encoding */
+ CHECK_STREAM_PTR(2);
+
+ P[0] = *s->stream_ptr++;
+ P[1] = *s->stream_ptr++;
+
+ if (P[0] <= P[1]) {
+
+ /* need 8 more bytes from the stream */
+ CHECK_STREAM_PTR(8);
+
+ for (y = 0; y < 8; y++) {
+ flags = *s->stream_ptr++ | 0x100;
+ for (; flags != 1; flags >>= 1)
+ *s->pixel_ptr++ = P[flags & 1];
+ s->pixel_ptr += s->line_inc;
+ }
+
+ } else {
+
+ /* need 2 more bytes from the stream */
+ CHECK_STREAM_PTR(2);
+
+ flags = bytestream_get_le16(&s->stream_ptr);
+ for (y = 0; y < 8; y += 2) {
+ for (x = 0; x < 8; x += 2, flags >>= 1) {
+ s->pixel_ptr[x ] =
+ s->pixel_ptr[x + 1 ] =
+ s->pixel_ptr[x + s->stride] =
+ s->pixel_ptr[x + 1 + s->stride] = P[flags & 1];
+ }
+ s->pixel_ptr += s->stride * 2;
+ }
+ }
+
+ /* report success */
+ return 0;
+}
+
+static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
+{
+ int x, y;
+ unsigned char P[2];
+ unsigned int flags = 0;
+
+ /* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
+ * either top and bottom or left and right halves */
+ CHECK_STREAM_PTR(2);
+
+ P[0] = *s->stream_ptr++;
+ P[1] = *s->stream_ptr++;
+
+ if (P[0] <= P[1]) {
+
+ CHECK_STREAM_PTR(14);
+ s->stream_ptr -= 2;
+
+ for (y = 0; y < 16; y++) {
+ // new values for each 4x4 block
+ if (!(y & 3)) {
+ P[0] = *s->stream_ptr++; P[1] = *s->stream_ptr++;
+ flags = bytestream_get_le16(&s->stream_ptr);
+ }
+
+ for (x = 0; x < 4; x++, flags >>= 1)
+ *s->pixel_ptr++ = P[flags & 1];
+ s->pixel_ptr += s->stride - 4;
+ // switch to right half
+ if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
+ }
+
+ } else {
+
+ /* need 10 more bytes */
+ CHECK_STREAM_PTR(10);
+
+ if (s->stream_ptr[4] <= s->stream_ptr[5]) {
+
+ flags = bytestream_get_le32(&s->stream_ptr);
+
+ /* vertical split; left & right halves are 2-color encoded */
+
+ for (y = 0; y < 16; y++) {
+ for (x = 0; x < 4; x++, flags >>= 1)
+ *s->pixel_ptr++ = P[flags & 1];
+ s->pixel_ptr += s->stride - 4;
+ // switch to right half
+ if (y == 7) {
+ s->pixel_ptr -= 8 * s->stride - 4;
+ P[0] = *s->stream_ptr++; P[1] = *s->stream_ptr++;
+ flags = bytestream_get_le32(&s->stream_ptr);
+ }
+ }
+
+ } else {
+
+ /* horizontal split; top & bottom halves are 2-color encoded */
+
+ for (y = 0; y < 8; y++) {
+ if (y == 4) {
+ P[0] = *s->stream_ptr++;
+ P[1] = *s->stream_ptr++;
+ }
+ flags = *s->stream_ptr++ | 0x100;
+
+ for (; flags != 1; flags >>= 1)
+ *s->pixel_ptr++ = P[flags & 1];
+ s->pixel_ptr += s->line_inc;
+ }
+ }
+ }
+
+ /* report success */
+ return 0;
+}
+
+static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s)
+{
+ int x, y;
+ unsigned char P[4];
+
+ /* 4-color encoding */
+ CHECK_STREAM_PTR(4);
+
+ memcpy(P, s->stream_ptr, 4);
+ s->stream_ptr += 4;
+
+ if (P[0] <= P[1]) {
+ if (P[2] <= P[3]) {
+
+ /* 1 of 4 colors for each pixel, need 16 more bytes */
+ CHECK_STREAM_PTR(16);
+
+ for (y = 0; y < 8; y++) {
+ /* get the next set of 8 2-bit flags */
+ int flags = bytestream_get_le16(&s->stream_ptr);
+ for (x = 0; x < 8; x++, flags >>= 2)
+ *s->pixel_ptr++ = P[flags & 0x03];
+ s->pixel_ptr += s->line_inc;
+ }
+
+ } else {
+ uint32_t flags;
+
+ /* 1 of 4 colors for each 2x2 block, need 4 more bytes */
+ CHECK_STREAM_PTR(4);
+
+ flags = bytestream_get_le32(&s->stream_ptr);
+
+ for (y = 0; y < 8; y += 2) {
+ for (x = 0; x < 8; x += 2, flags >>= 2) {
+ s->pixel_ptr[x ] =
+ s->pixel_ptr[x + 1 ] =
+ s->pixel_ptr[x + s->stride] =
+ s->pixel_ptr[x + 1 + s->stride] = P[flags & 0x03];
+ }
+ s->pixel_ptr += s->stride * 2;
+ }
+
+ }
+ } else {
+ uint64_t flags;
+
+ /* 1 of 4 colors for each 2x1 or 1x2 block, need 8 more bytes */
+ CHECK_STREAM_PTR(8);
+
+ flags = bytestream_get_le64(&s->stream_ptr);
+ if (P[2] <= P[3]) {
+ for (y = 0; y < 8; y++) {
+ for (x = 0; x < 8; x += 2, flags >>= 2) {
+ s->pixel_ptr[x ] =
+ s->pixel_ptr[x + 1] = P[flags & 0x03];
+ }
+ s->pixel_ptr += s->stride;
+ }
+ } else {
+ for (y = 0; y < 8; y += 2) {
+ for (x = 0; x < 8; x++, flags >>= 2) {
+ s->pixel_ptr[x ] =
+ s->pixel_ptr[x + s->stride] = P[flags & 0x03];
+ }
+ s->pixel_ptr += s->stride * 2;
+ }
+ }
+ }
+
+ /* report success */
+ return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s)
+{
+ int x, y;
+ unsigned char P[4];
+ int flags = 0;
+
+ /* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
+ * either top and bottom or left and right halves */
+ CHECK_STREAM_PTR(24);
+
+ if (s->stream_ptr[0] <= s->stream_ptr[1]) {
+
+ /* 4-color encoding for each quadrant; need 32 bytes */
+ CHECK_STREAM_PTR(32);
+
+ for (y = 0; y < 16; y++) {
+ // new values for each 4x4 block
+ if (!(y & 3)) {
+ memcpy(P, s->stream_ptr, 4);
+ s->stream_ptr += 4;
+ flags = bytestream_get_le32(&s->stream_ptr);
+ }
+
+ for (x = 0; x < 4; x++, flags >>= 2)
+ *s->pixel_ptr++ = P[flags & 0x03];
+
+ s->pixel_ptr += s->stride - 4;
+ // switch to right half
+ if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
+ }
+
+ } else {
+ // vertical split?
+ int vert = s->stream_ptr[12] <= s->stream_ptr[13];
+ uint64_t flags = 0;
+
+ /* 4-color encoding for either left and right or top and bottom
+ * halves */
+
+ for (y = 0; y < 16; y++) {
+ // load values for each half
+ if (!(y & 7)) {
+ memcpy(P, s->stream_ptr, 4);
+ s->stream_ptr += 4;
+ flags = bytestream_get_le64(&s->stream_ptr);
+ }
+
+ for (x = 0; x < 4; x++, flags >>= 2)
+ *s->pixel_ptr++ = P[flags & 0x03];
+
+ if (vert) {
+ s->pixel_ptr += s->stride - 4;
+ // switch to right half
+ if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
+ } else if (y & 1) s->pixel_ptr += s->line_inc;
+ }
+ }
+
+ /* report success */
+ return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xB(IpvideoContext *s)
+{
+ int y;
+
+ /* 64-color encoding (each pixel in block is a different color) */
+ CHECK_STREAM_PTR(64);
+
+ for (y = 0; y < 8; y++) {
+ memcpy(s->pixel_ptr, s->stream_ptr, 8);
+ s->stream_ptr += 8;
+ s->pixel_ptr += s->stride;
+ }
+
+ /* report success */
+ return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xC(IpvideoContext *s)
+{
+ int x, y;
+
+ /* 16-color block encoding: each 2x2 block is a different color */
+ CHECK_STREAM_PTR(16);
+
+ for (y = 0; y < 8; y += 2) {
+ for (x = 0; x < 8; x += 2) {
+ s->pixel_ptr[x ] =
+ s->pixel_ptr[x + 1 ] =
+ s->pixel_ptr[x + s->stride] =
+ s->pixel_ptr[x + 1 + s->stride] = *s->stream_ptr++;
+ }
+ s->pixel_ptr += s->stride * 2;
+ }
+
+ /* report success */
+ return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xD(IpvideoContext *s)
+{
+ int y;
+ unsigned char P[2];
+
+ /* 4-color block encoding: each 4x4 block is a different color */
+ CHECK_STREAM_PTR(4);
+
+ for (y = 0; y < 8; y++) {
+ if (!(y & 3)) {
+ P[0] = *s->stream_ptr++;
+ P[1] = *s->stream_ptr++;
+ }
+ memset(s->pixel_ptr, P[0], 4);
+ memset(s->pixel_ptr + 4, P[1], 4);
+ s->pixel_ptr += s->stride;
+ }
+
+ /* report success */
+ return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xE(IpvideoContext *s)
+{
+ int y;
+ unsigned char pix;
+
+ /* 1-color encoding: the whole block is 1 solid color */
+ CHECK_STREAM_PTR(1);
+ pix = *s->stream_ptr++;
+
+ for (y = 0; y < 8; y++) {
+ memset(s->pixel_ptr, pix, 8);
+ s->pixel_ptr += s->stride;
+ }
+
+ /* report success */
+ return 0;
+}
+
+static int ipvideo_decode_block_opcode_0xF(IpvideoContext *s)
+{
+ int x, y;
+ unsigned char sample[2];
+
+ /* dithered encoding */
+ CHECK_STREAM_PTR(2);
+ sample[0] = *s->stream_ptr++;
+ sample[1] = *s->stream_ptr++;
+
+ for (y = 0; y < 8; y++) {
+ for (x = 0; x < 8; x += 2) {
+ *s->pixel_ptr++ = sample[ y & 1 ];
+ *s->pixel_ptr++ = sample[!(y & 1)];
+ }
+ s->pixel_ptr += s->line_inc;
+ }
+
+ /* report success */
+ return 0;
+}
+
+static int (* const ipvideo_decode_block[])(IpvideoContext *s) = {
+ ipvideo_decode_block_opcode_0x0, ipvideo_decode_block_opcode_0x1,
+ ipvideo_decode_block_opcode_0x2, ipvideo_decode_block_opcode_0x3,
+ ipvideo_decode_block_opcode_0x4, ipvideo_decode_block_opcode_0x5,
+ ipvideo_decode_block_opcode_0x6, ipvideo_decode_block_opcode_0x7,
+ ipvideo_decode_block_opcode_0x8, ipvideo_decode_block_opcode_0x9,
+ ipvideo_decode_block_opcode_0xA, ipvideo_decode_block_opcode_0xB,
+ ipvideo_decode_block_opcode_0xC, ipvideo_decode_block_opcode_0xD,
+ ipvideo_decode_block_opcode_0xE, ipvideo_decode_block_opcode_0xF,
+};
+
+static void ipvideo_decode_opcodes(IpvideoContext *s)
+{
+ int x, y;
+ unsigned char opcode;
+ int ret;
+ static int frame = 0;
+ GetBitContext gb;
+
+ debug_interplay("------------------ frame %d\n", frame);
+ frame++;
+
+ /* this is PAL8, so make the palette available */
+ memcpy(s->current_frame.data[1], s->avctx->palctrl->palette, PALETTE_COUNT * 4);
+
+ s->stride = s->current_frame.linesize[0];
+ s->stream_ptr = s->buf + 14; /* data starts 14 bytes in */
+ s->stream_end = s->buf + s->size;
+ s->line_inc = s->stride - 8;
+ s->upper_motion_limit_offset = (s->avctx->height - 8) * s->stride
+ + s->avctx->width - 8;
+
+ init_get_bits(&gb, s->decoding_map, s->decoding_map_size * 8);
+ for (y = 0; y < (s->stride * s->avctx->height); y += s->stride * 8) {
+ for (x = y; x < y + s->avctx->width; x += 8) {
+ opcode = get_bits(&gb, 4);
+
+ debug_interplay(" block @ (%3d, %3d): encoding 0x%X, data ptr @ %p\n",
+ x - y, y / s->stride, opcode, s->stream_ptr);
+
+ s->pixel_ptr = s->current_frame.data[0] + x;
+ ret = ipvideo_decode_block[opcode](s);
+ if (ret != 0) {
+ av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode problem on frame %d, @ block (%d, %d)\n",
+ frame, x - y, y / s->stride);
+ return;
+ }
+ }
+ }
+ if (s->stream_end - s->stream_ptr > 1) {
+ av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode finished with %td bytes left over\n",
+ s->stream_end - s->stream_ptr);
+ }
+}
+
+static av_cold int ipvideo_decode_init(AVCodecContext *avctx)
{
IpvideoContext *s = avctx->priv_data;
s->avctx = avctx;
- avctx->pix_fmt = PIX_FMT_YUV444P;
- avctx->has_b_frames = 0;
- dsputil_init(&s->dsp, avctx);
- s->first_frame = 1;
- s->receiving_decoding_map = 1; /* decoding map will be received first */
+ if (s->avctx->palctrl == NULL) {
+ av_log(avctx, AV_LOG_ERROR, " Interplay video: palette expected.\n");
+ return -1;
+ }
+
+ avctx->pix_fmt = PIX_FMT_PAL8;
+ dsputil_init(&s->dsp, avctx);
/* decoding map contains 4 bits of information per 8x8 block */
s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2);
- s->decoding_map = av_malloc(s->decoding_map_size);
+
+ s->current_frame.data[0] = s->last_frame.data[0] =
+ s->second_last_frame.data[0] = NULL;
return 0;
}
static int ipvideo_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
IpvideoContext *s = avctx->priv_data;
+ AVPaletteControl *palette_control = avctx->palctrl;
- if (s->receiving_decoding_map) {
- /* receiving the decoding map on this iteration */
- s->receiving_decoding_map = 0;
+ /* compressed buffer needs to be large enough to at least hold an entire
+ * decoding map */
+ if (buf_size < s->decoding_map_size)
+ return buf_size;
- if (buf_size != s->decoding_map_size)
- printf (" Interplay video: buf_size != decoding_map_size (%d != %d)\n",
- buf_size, s->decoding_map_size);
- else
- memcpy(s->decoding_map, buf, buf_size);
+ s->decoding_map = buf;
+ s->buf = buf + s->decoding_map_size;
+ s->size = buf_size - s->decoding_map_size;
- *data_size = 0;
- *(AVFrame*)data = s->last_frame;
- } else {
- /* receiving the compressed video data on this iteration */
- s->receiving_decoding_map = 1;
- s->buf = buf;
- s->size = buf_size;
-
- if (avctx->get_buffer(avctx, &s->current_frame)) {
- printf (" Interplay Video: get_buffer() failed\n");
- return -1;
- }
+ s->current_frame.reference = 3;
+ if (avctx->get_buffer(avctx, &s->current_frame)) {
+ av_log(avctx, AV_LOG_ERROR, " Interplay Video: get_buffer() failed\n");
+ return -1;
+ }
-// ipvideo_decode_frame(s);
-memset(s->current_frame.data[0], 0x80, s->current_frame.linesize[0] * avctx->height);
-memset(s->current_frame.data[1], 0x80, s->current_frame.linesize[1] * avctx->height / 4);
-memset(s->current_frame.data[2], 0x80, s->current_frame.linesize[2] * avctx->height / 4);
+ ipvideo_decode_opcodes(s);
- /* release the last frame if it is allocated */
- if (s->first_frame)
- s->first_frame = 0;
- else
- avctx->release_buffer(avctx, &s->last_frame);
+ if (palette_control->palette_changed) {
+ palette_control->palette_changed = 0;
+ s->current_frame.palette_has_changed = 1;
+ }
- /* shuffle frames */
- s->last_frame = s->current_frame;
+ *data_size = sizeof(AVFrame);
+ *(AVFrame*)data = s->current_frame;
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = s->current_frame;
- }
+ /* shuffle frames */
+ if (s->second_last_frame.data[0])
+ avctx->release_buffer(avctx, &s->second_last_frame);
+ s->second_last_frame = s->last_frame;
+ s->last_frame = s->current_frame;
+ s->current_frame.data[0] = NULL; /* catch any access attempts */
- /* always report that the buffer was completely consumed */
+ /* report that the buffer was completely consumed */
return buf_size;
}
-static int ipvideo_decode_end(AVCodecContext *avctx)
+static av_cold int ipvideo_decode_end(AVCodecContext *avctx)
{
IpvideoContext *s = avctx->priv_data;
/* release the last frame */
- avctx->release_buffer(avctx, &s->last_frame);
-
- av_free(s->decoding_map);
+ if (s->last_frame.data[0])
+ avctx->release_buffer(avctx, &s->last_frame);
+ if (s->second_last_frame.data[0])
+ avctx->release_buffer(avctx, &s->second_last_frame);
return 0;
}
ipvideo_decode_end,
ipvideo_decode_frame,
CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Interplay MVE video"),
};