* Electronic Arts TGV Video Decoder
* Copyright (c) 2007-2008 Peter Ross
*
- * 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file libavcodec/eatgv.c
+ * @file
* Electronic Arts TGV Video Decoder
- * by Peter Ross (suxen_drol at hotmail dot com)
+ * by Peter Ross (pross@xvid.org)
*
* Technical details here:
* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGV
*/
+#include "libavutil/imgutils.h"
+#include "libavutil/mem.h"
+
+#define BITSTREAM_READER_LE
#include "avcodec.h"
-#define ALT_BITSTREAM_READER_LE
#include "bitstream.h"
-#include "libavutil/lzo.h"
+#include "internal.h"
#define EA_PREAMBLE_SIZE 8
#define kVGT_TAG MKTAG('k', 'V', 'G', 'T')
typedef struct TgvContext {
AVCodecContext *avctx;
- AVFrame frame;
- AVFrame last_frame;
+ AVFrame *last_frame;
+ uint8_t *frame_buffer;
int width,height;
- unsigned int palette[AVPALETTE_COUNT];
+ uint32_t palette[AVPALETTE_COUNT];
int (*mv_codebook)[2];
- unsigned char (*block_codebook)[16];
+ uint8_t (*block_codebook)[16];
int num_mvs; ///< current length of mv_codebook
int num_blocks_packed; ///< current length of block_codebook
} TgvContext;
-static av_cold int tgv_decode_init(AVCodecContext *avctx){
+static av_cold int tgv_decode_init(AVCodecContext *avctx)
+{
TgvContext *s = avctx->priv_data;
- s->avctx = avctx;
- avctx->time_base = (AVRational){1, 15};
- avctx->pix_fmt = PIX_FMT_PAL8;
+ s->avctx = avctx;
+ avctx->framerate = (AVRational){ 15, 1 };
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
+
+ s->last_frame = av_frame_alloc();
+ if (!s->last_frame)
+ return AVERROR(ENOMEM);
+
return 0;
}
* Unpack buffer
* @return 0 on success, -1 on critical buffer underflow
*/
-static int unpack(const uint8_t *src, const uint8_t *src_end, unsigned char *dst, int width, int height) {
- unsigned char *dst_end = dst + width*height;
- int size, size1, size2, av_uninit(offset), run;
- unsigned char *dst_start = dst;
+static int unpack(const uint8_t *src, const uint8_t *src_end,
+ uint8_t *dst, int width, int height)
+{
+ uint8_t *dst_end = dst + width*height;
+ int size, size1, size2, offset, run;
+ uint8_t *dst_start = dst;
if (src[0] & 0x01)
src += 5;
else
src += 2;
- if (src+3>src_end)
- return -1;
+ if (src + 3 > src_end)
+ return AVERROR_INVALIDDATA;
size = AV_RB24(src);
src += 3;
- while(size>0 && src<src_end) {
+ while (size > 0 && src < src_end) {
/* determine size1 and size2 */
size1 = (src[0] & 3);
- if ( src[0] & 0x80 ) { // 1
+ if (src[0] & 0x80) { // 1
if (src[0] & 0x40 ) { // 11
- if ( src[0] & 0x20 ) { // 111
- if ( src[0] < 0xFC ) // !(111111)
+ if (src[0] & 0x20) { // 111
+ if (src[0] < 0xFC) // !(111111)
size1 = (((src[0] & 31) + 1) << 2);
src++;
size2 = 0;
} else { // 110
offset = ((src[0] & 0x10) << 12) + AV_RB16(&src[1]) + 1;
- size2 = ((src[0] & 0xC) << 6) + src[3] + 5;
- src += 4;
+ size2 = ((src[0] & 0xC) << 6) + src[3] + 5;
+ src += 4;
}
} else { // 10
- size1 = ( ( src[1] & 0xC0) >> 6 );
+ size1 = ((src[1] & 0xC0) >> 6);
offset = (AV_RB16(&src[1]) & 0x3FFF) + 1;
- size2 = (src[0] & 0x3F) + 4;
- src += 3;
+ size2 = (src[0] & 0x3F) + 4;
+ src += 3;
}
} else { // 0
offset = ((src[0] & 0x60) << 3) + src[1] + 1;
- size2 = ((src[0] & 0x1C) >> 2) + 3;
- src += 2;
+ size2 = ((src[0] & 0x1C) >> 2) + 3;
+ src += 2;
}
/* fetch strip from src */
- if (size1>src_end-src)
+ if (size1 > src_end - src)
break;
- if (size1>0) {
+ if (size1 > 0) {
size -= size1;
- run = FFMIN(size1, dst_end-dst);
+ run = FFMIN(size1, dst_end - dst);
memcpy(dst, src, run);
dst += run;
src += run;
}
- if (size2>0) {
- if (dst-dst_start<offset)
+ if (size2 > 0) {
+ if (dst - dst_start < offset)
return 0;
size -= size2;
- run = FFMIN(size2, dst_end-dst);
+ run = FFMIN(size2, dst_end - dst);
av_memcpy_backptr(dst, offset, run);
dst += run;
}
* Decode inter-frame
* @return 0 on success, -1 on critical buffer underflow
*/
-static int tgv_decode_inter(TgvContext * s, const uint8_t *buf, const uint8_t *buf_end){
- unsigned char *frame0_end = s->last_frame.data[0] + s->avctx->width*s->last_frame.linesize[0];
+static int tgv_decode_inter(TgvContext *s, AVFrame *frame,
+ const uint8_t *buf, const uint8_t *buf_end)
+{
int num_mvs;
int num_blocks_raw;
int num_blocks_packed;
int vector_bits;
int i,j,x,y;
- GetBitContext gb;
+ BitstreamContext bc;
int mvbits;
- const unsigned char *blocks_raw;
+ const uint8_t *blocks_raw;
- if(buf+12>buf_end)
- return -1;
+ if (buf + 12 > buf_end)
+ return AVERROR_INVALIDDATA;
num_mvs = AV_RL16(&buf[0]);
num_blocks_raw = AV_RL16(&buf[2]);
vector_bits = AV_RL16(&buf[6]);
buf += 12;
- /* allocate codebook buffers as neccessary */
+ if (vector_bits > 32 || !vector_bits) {
+ av_log(s->avctx, AV_LOG_ERROR,
+ "Invalid value for motion vector bits: %d\n", vector_bits);
+ return AVERROR_INVALIDDATA;
+ }
+
+ /* allocate codebook buffers as necessary */
if (num_mvs > s->num_mvs) {
- s->mv_codebook = av_realloc(s->mv_codebook, num_mvs*2*sizeof(int));
+ int err = av_reallocp(&s->mv_codebook, num_mvs * 2 * sizeof(int));
+ if (err < 0)
+ return err;
s->num_mvs = num_mvs;
}
if (num_blocks_packed > s->num_blocks_packed) {
- s->block_codebook = av_realloc(s->block_codebook, num_blocks_packed*16*sizeof(unsigned char));
+ int err;
+ if ((err = av_reallocp(&s->block_codebook, num_blocks_packed * 16)) < 0) {
+ s->num_blocks_packed = 0;
+ return err;
+ }
s->num_blocks_packed = num_blocks_packed;
}
/* read motion vectors */
- mvbits = (num_mvs*2*10+31) & ~31;
+ mvbits = (num_mvs * 2 * 10 + 31) & ~31;
- if (buf+(mvbits>>3)+16*num_blocks_raw+8*num_blocks_packed>buf_end)
- return -1;
+ if (buf + (mvbits >> 3) + 16 * num_blocks_raw + 8 * num_blocks_packed > buf_end)
+ return AVERROR_INVALIDDATA;
- init_get_bits(&gb, buf, mvbits);
- for (i=0; i<num_mvs; i++) {
- s->mv_codebook[i][0] = get_sbits(&gb, 10);
- s->mv_codebook[i][1] = get_sbits(&gb, 10);
+ bitstream_init(&bc, buf, mvbits);
+ for (i = 0; i < num_mvs; i++) {
+ s->mv_codebook[i][0] = bitstream_read_signed(&bc, 10);
+ s->mv_codebook[i][1] = bitstream_read_signed(&bc, 10);
}
- buf += mvbits>>3;
+ buf += mvbits >> 3;
/* note ptr to uncompressed blocks */
blocks_raw = buf;
- buf += num_blocks_raw*16;
+ buf += num_blocks_raw * 16;
/* read compressed blocks */
- init_get_bits(&gb, buf, (buf_end-buf)<<3);
- for (i=0; i<num_blocks_packed; i++) {
+ bitstream_init(&bc, buf, (buf_end - buf) << 3);
+ for (i = 0; i < num_blocks_packed; i++) {
int tmp[4];
- for(j=0; j<4; j++)
- tmp[j] = get_bits(&gb, 8);
- for(j=0; j<16; j++)
- s->block_codebook[i][15-j] = tmp[get_bits(&gb, 2)];
+ for (j = 0; j < 4; j++)
+ tmp[j] = bitstream_read(&bc, 8);
+ for (j = 0; j < 16; j++)
+ s->block_codebook[i][15-j] = tmp[bitstream_read(&bc, 2)];
}
+ if (bitstream_bits_left(&bc) < vector_bits *
+ (s->avctx->height / 4) * (s->avctx->width / 4))
+ return AVERROR_INVALIDDATA;
+
/* read vectors and build frame */
- for(y=0; y<s->avctx->height/4; y++)
- for(x=0; x<s->avctx->width/4; x++) {
- unsigned int vector = get_bits(&gb, vector_bits);
- const unsigned char *src;
- int src_stride;
-
- if (vector < num_mvs) {
- src = s->last_frame.data[0] +
- (y*4 + s->mv_codebook[vector][1])*s->last_frame.linesize[0] +
- x*4 + s->mv_codebook[vector][0];
- src_stride = s->last_frame.linesize[0];
- if (src+3*src_stride+3>=frame0_end)
- continue;
- }else{
- int offset = vector - num_mvs;
- if (offset<num_blocks_raw)
- src = blocks_raw + 16*offset;
- else if (offset-num_blocks_raw<num_blocks_packed)
- src = s->block_codebook[offset-num_blocks_raw];
- else
- continue;
- src_stride = 4;
- }
+ for (y = 0; y < s->avctx->height / 4; y++)
+ for (x = 0; x < s->avctx->width / 4; x++) {
+ unsigned int vector = bitstream_read(&bc, vector_bits);
+ const uint8_t *src;
+ ptrdiff_t src_stride;
+
+ if (vector < num_mvs) {
+ int mx = x * 4 + s->mv_codebook[vector][0];
+ int my = y * 4 + s->mv_codebook[vector][1];
+
+ if (mx < 0 || mx + 4 > s->avctx->width ||
+ my < 0 || my + 4 > s->avctx->height)
+ continue;
+
+ src = s->last_frame->data[0] + mx + my * s->last_frame->linesize[0];
+ src_stride = s->last_frame->linesize[0];
+ } else {
+ int offset = vector - num_mvs;
+ if (offset < num_blocks_raw)
+ src = blocks_raw + 16*offset;
+ else if (offset - num_blocks_raw < num_blocks_packed)
+ src = s->block_codebook[offset - num_blocks_raw];
+ else
+ continue;
+ src_stride = 4;
+ }
- for(j=0; j<4; j++)
- for(i=0; i<4; i++)
- s->frame.data[0][ (y*4+j)*s->frame.linesize[0] + (x*4+i) ] =
- src[j*src_stride + i];
+ for (j = 0; j < 4; j++)
+ for (i = 0; i < 4; i++)
+ frame->data[0][(y * 4 + j) * frame->linesize[0] + (x * 4 + i)] =
+ src[j * src_stride + i];
}
return 0;
}
-/** release AVFrame buffers if allocated */
-static void cond_release_buffer(AVFrame *pic)
-{
- if (pic->data[0]) {
- av_freep(&pic->data[0]);
- av_free(pic->data[1]);
- }
-}
-
static int tgv_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- const uint8_t *buf, int buf_size)
+ void *data, int *got_frame,
+ AVPacket *avpkt)
{
- TgvContext *s = avctx->priv_data;
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ TgvContext *s = avctx->priv_data;
const uint8_t *buf_end = buf + buf_size;
- int chunk_type;
+ AVFrame *frame = data;
+ int chunk_type, ret;
chunk_type = AV_RL32(&buf[0]);
- buf += EA_PREAMBLE_SIZE;
+ buf += EA_PREAMBLE_SIZE;
- if (chunk_type==kVGT_TAG) {
+ if (chunk_type == kVGT_TAG) {
int pal_count, i;
- if(buf+12>buf_end) {
+ if (buf + 12 > buf_end) {
av_log(avctx, AV_LOG_WARNING, "truncated header\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
s->width = AV_RL16(&buf[0]);
s->height = AV_RL16(&buf[2]);
- if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
- avcodec_set_dimensions(s->avctx, s->width, s->height);
- cond_release_buffer(&s->frame);
- cond_release_buffer(&s->last_frame);
+ if (s->avctx->width != s->width || s->avctx->height != s->height) {
+ av_freep(&s->frame_buffer);
+ av_frame_unref(s->last_frame);
+ if ((ret = ff_set_dimensions(s->avctx, s->width, s->height)) < 0)
+ return ret;
}
pal_count = AV_RL16(&buf[6]);
buf += 12;
- for(i=0; i<pal_count && i<AVPALETTE_COUNT && buf+2<buf_end; i++) {
+ for (i = 0; i < pal_count && i < AVPALETTE_COUNT && buf + 2 < buf_end; i++) {
s->palette[i] = AV_RB24(buf);
buf += 3;
}
}
- if (avcodec_check_dimensions(avctx, s->width, s->height))
- return -1;
-
- /* shuffle */
- FFSWAP(AVFrame, s->frame, s->last_frame);
- if (!s->frame.data[0]) {
- s->frame.reference = 1;
- s->frame.buffer_hints = FF_BUFFER_HINTS_VALID;
- s->frame.linesize[0] = s->width;
-
- /* allocate additional 12 bytes to accomodate av_memcpy_backptr() OUTBUF_PADDED optimisation */
- s->frame.data[0] = av_malloc(s->width*s->height + 12);
- if (!s->frame.data[0])
- return AVERROR_NOMEM;
- s->frame.data[1] = av_malloc(AVPALETTE_SIZE);
- if (!s->frame.data[1]) {
- av_freep(&s->frame.data[0]);
- return AVERROR_NOMEM;
- }
- }
- memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
+ if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
+ return ret;
+
+ memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
+
+ if (chunk_type == kVGT_TAG) {
+ int y;
+ frame->key_frame = 1;
+ frame->pict_type = AV_PICTURE_TYPE_I;
- if(chunk_type==kVGT_TAG) {
- s->frame.key_frame = 1;
- s->frame.pict_type = FF_I_TYPE;
- if (unpack(buf, buf_end, s->frame.data[0], s->avctx->width, s->avctx->height)<0) {
+ if (!s->frame_buffer &&
+ !(s->frame_buffer = av_malloc(s->width * s->height)))
+ return AVERROR(ENOMEM);
+
+ if (unpack(buf, buf_end, s->frame_buffer, s->avctx->width, s->avctx->height) < 0) {
av_log(avctx, AV_LOG_WARNING, "truncated intra frame\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
- }else{
- if (!s->last_frame.data[0]) {
+ for (y = 0; y < s->height; y++)
+ memcpy(frame->data[0] + y * frame->linesize[0],
+ s->frame_buffer + y * s->width,
+ s->width);
+ } else {
+ if (!s->last_frame->data[0]) {
av_log(avctx, AV_LOG_WARNING, "inter frame without corresponding intra frame\n");
return buf_size;
}
- s->frame.key_frame = 0;
- s->frame.pict_type = FF_P_TYPE;
- if (tgv_decode_inter(s, buf, buf_end)<0) {
+ frame->key_frame = 0;
+ frame->pict_type = AV_PICTURE_TYPE_P;
+ if (tgv_decode_inter(s, frame, buf, buf_end) < 0) {
av_log(avctx, AV_LOG_WARNING, "truncated inter frame\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
}
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = s->frame;
+ av_frame_unref(s->last_frame);
+ if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
+ return ret;
+
+ *got_frame = 1;
return buf_size;
}
static av_cold int tgv_decode_end(AVCodecContext *avctx)
{
TgvContext *s = avctx->priv_data;
- cond_release_buffer(&s->frame);
- cond_release_buffer(&s->last_frame);
+ av_frame_free(&s->last_frame);
+ av_freep(&s->frame_buffer);
av_free(s->mv_codebook);
av_free(s->block_codebook);
return 0;
}
-AVCodec eatgv_decoder = {
- "eatgv",
- CODEC_TYPE_VIDEO,
- CODEC_ID_TGV,
- sizeof(TgvContext),
- tgv_decode_init,
- NULL,
- tgv_decode_end,
- tgv_decode_frame,
- .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGV video"),
+AVCodec ff_eatgv_decoder = {
+ .name = "eatgv",
+ .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGV video"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_TGV,
+ .priv_data_size = sizeof(TgvContext),
+ .init = tgv_decode_init,
+ .close = tgv_decode_end,
+ .decode = tgv_decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
};
projects / ffmpeg / blobdiff