* Electronic Arts Madcow Video Decoder
* Copyright (c) 2007-2009 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
* Electronic Arts Madcow Video Decoder
- *
by Peter Ross <pross@xvid.org>
+ *
@author Peter Ross <pross@xvid.org>
*
- * Technical details here:
+ * @see technical details at
* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_MAD
*/
#include "avcodec.h"
-#include "get_bits.h"
-#include "dsputil.h"
+#include "bitstream.h"
+#include "blockdsp.h"
+#include "bytestream.h"
+#include "bswapdsp.h"
#include "aandcttab.h"
-#include "mpeg12.h"
+#include "eaidct.h"
+#include "idctdsp.h"
+#include "internal.h"
#include "mpeg12data.h"
-#include "libavcore/imgutils.h"
+#include "mpeg12vlc.h"
+#include "vlc.h"
#define EA_PREAMBLE_SIZE 8
-#define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD i-frame */
-#define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD p-frame */
+#define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD I-frame */
+#define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD P-frame */
#define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */
typedef struct MadContext {
- MpegEncContext s;
- AVFrame frame;
- AVFrame last_frame;
+ AVCodecContext *avctx;
+ BlockDSPContext bdsp;
+ BswapDSPContext bbdsp;
+ IDCTDSPContext idsp;
+ AVFrame *last_frame;
+ BitstreamContext bc;
void *bitstream_buf;
unsigned int bitstream_buf_size;
- DECLARE_ALIGNED(16, DCTELEM, block)[64];
+ DECLARE_ALIGNED(16, int16_t, block)[64];
+ ScanTable scantable;
+ uint16_t quant_matrix[64];
+ int mb_x;
+ int mb_y;
} MadContext;
-static void bswap16_buf(uint16_t *dst, const uint16_t *src, int count)
-{
- int i;
- for (i=0; i<count; i++)
- dst[i] = av_bswap16(src[i]);
-}
-
static av_cold int decode_init(AVCodecContext *avctx)
{
- MadContext *t = avctx->priv_data;
- MpegEncContext *s = &t->s;
+ MadContext *s = avctx->priv_data;
s->avctx = avctx;
- avctx->pix_fmt = PIX_FMT_YUV420P;
- if (avctx->idct_algo == FF_IDCT_AUTO)
- avctx->idct_algo = FF_IDCT_EA;
- dsputil_init(&s->dsp, avctx);
- ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
+ avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+ ff_blockdsp_init(&s->bdsp, avctx);
+ ff_bswapdsp_init(&s->bbdsp);
+ ff_idctdsp_init(&s->idsp, avctx);
+ ff_init_scantable_permutation(s->idsp.idct_permutation, FF_IDCT_PERM_NONE);
+ ff_init_scantable(s->idsp.idct_permutation, &s->scantable, ff_zigzag_direct);
ff_mpeg12_init_vlcs();
+
+ s->last_frame = av_frame_alloc();
+ if (!s->last_frame)
+ return AVERROR(ENOMEM);
+
return 0;
}
-static inline void comp(unsigned char *dst, int dst_stride,
- unsigned char *src, int src_stride, int add)
+static inline void comp(unsigned char *dst, ptrdiff_t dst_stride,
+ unsigned char *src, ptrdiff_t src_stride, int add)
{
int j, i;
for (j=0; j<8; j++)
dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
}
-static inline void comp_block(MadContext *t, int mb_x, int mb_y,
+static inline void comp_block(MadContext *t, AVFrame *frame,
+ int mb_x, int mb_y,
int j, int mv_x, int mv_y, int add)
{
- MpegEncContext *s = &t->s;
if (j < 4) {
- comp(t->frame.data[0] + (mb_y*16 + ((j&2)<<2))*t->frame.linesize[0] + mb_x*16 + ((j&1)<<3),
- t->frame.linesize[0],
- t->last_frame.data[0] + (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame.linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x,
- t->last_frame.linesize[0], add);
- } else if (!(s->avctx->flags & CODEC_FLAG_GRAY)) {
+ comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
+ frame->linesize[0],
+ t->last_frame->data[0] + (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x,
+ t->last_frame->linesize[0], add);
+ } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
int index = j - 3;
- comp(t->frame.data[index] + (mb_y*8)*t->frame.linesize[index] + mb_x * 8,
- t->frame.linesize[index],
- t->last_frame.data[index] + (mb_y * 8 + (mv_y/2))*t->last_frame.linesize[index] + mb_x * 8 + (mv_x/2),
- t->last_frame.linesize[index], add);
+ comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8,
+ frame->linesize[index],
+ t->last_frame->data[index] + (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2),
+ t->last_frame->linesize[index], add);
}
}
-static inline void idct_put(MadContext *t, DCTELEM *block, int mb_x, int mb_y, int j)
+static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block,
+ int mb_x, int mb_y, int j)
{
- MpegEncContext *s = &t->s;
if (j < 4) {
- s->dsp.idct_put(
- t->frame.data[0] + (mb_y*16 + ((j&2)<<2))*t->frame.linesize[0] + mb_x*16 + ((j&1)<<3),
- t->frame.linesize[0], block);
- } else if (!(s->avctx->flags & CODEC_FLAG_GRAY)) {
+ ff_ea_idct_put_c(
+ frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
+ frame->linesize[0], block);
+ } else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
int index = j - 3;
- s->dsp.idct_put(
- t->frame.data[index] + (mb_y*8)*t->frame.linesize[index] + mb_x*8,
- t->frame.linesize[index], block);
+ ff_ea_idct_put_c(
+ frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8,
+ frame->linesize[index], block);
}
}
-static inline void decode_block_intra(MadContext * t, DCTELEM * block)
+static inline void decode_block_intra(MadContext *s, int16_t * block)
{
- MpegEncContext *s = &t->s;
int level, i, j, run;
RLTable *rl = &ff_rl_mpeg1;
- const uint8_t *scantable = s->intra_scantable.permutated;
- int16_t *quant_matrix = s->intra_matrix;
+ const uint8_t *scantable = s->scantable.permutated;
+ int16_t *quant_matrix = s->quant_matrix;
- block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0];
+ block[0] = (128 + bitstream_read_signed(&s->bc, 8)) * quant_matrix[0];
/* The RL decoder is derived from mpeg1_decode_block_intra;
Escaped level and run values a decoded differently */
i = 0;
{
- OPEN_READER(re, &s->gb);
/* now quantify & encode AC coefficients */
for (;;) {
- UPDATE_CACHE(re, &s->gb);
- GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
+ BITSTREAM_RL_VLC(level, run, &s->bc, rl->rl_vlc[0], TEX_VLC_BITS, 2);
if (level == 127) {
break;
} else if (level != 0) {
i += run;
+ if (i > 63) {
+ av_log(s->avctx, AV_LOG_ERROR,
+ "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
+ return;
+ }
j = scantable[i];
level = (level*quant_matrix[j]) >> 4;
level = (level-1)|1;
- level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
- LAST_SKIP_BITS(re, &s->gb, 1);
+ level = bitstream_apply_sign(&s->bc, level);
} else {
/* escape */
- UPDATE_CACHE(re, &s->gb);
- level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);
+ level = bitstream_read_signed(&s->bc, 10);
- UPDATE_CACHE(re, &s->gb);
- run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
+ run = bitstream_read(&s->bc, 6) + 1;
i += run;
+ if (i > 63) {
+ av_log(s->avctx, AV_LOG_ERROR,
+ "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
+ return;
+ }
j = scantable[i];
if (level < 0) {
level = -level;
level = (level-1)|1;
}
}
- if (i > 63) {
- av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
- return;
- }
block[j] = level;
}
- CLOSE_READER(re, &s->gb);
}
}
-static int decode_motion(GetBitContext *gb)
+static int decode_motion(BitstreamContext *bc)
{
int value = 0;
- if (get_bits1(gb)) {
- if (get_bits1(gb))
+
+ if (bitstream_read_bit(bc)) {
+ if (bitstream_read_bit(bc))
value = -17;
- value += get_bits(gb, 4) + 1;
+ value += bitstream_read(bc, 4) + 1;
}
return value;
}
-static void decode_mb(MadContext *t, int inter)
+static void decode_mb(MadContext *s, AVFrame *frame, int inter)
{
- MpegEncContext *s = &t->s;
int mv_map = 0;
int mv_x, mv_y;
int j;
if (inter) {
- int v = decode210(&s->gb);
+ int v = bitstream_decode210(&s->bc);
if (v < 2) {
- mv_map = v ? get_bits(&s->gb, 6) : 63;
- mv_x = decode_motion(&s->gb);
- mv_y = decode_motion(&s->gb);
+ mv_map = v ? bitstream_read(&s->bc, 6) : 63;
+ mv_x = decode_motion(&s->bc);
+ mv_y = decode_motion(&s->bc);
} else {
mv_map = 0;
}
for (j=0; j<6; j++) {
if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map
- int add = 2*decode_motion(&s->gb);
- comp_block(t, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
+ int add = 2 * decode_motion(&s->bc);
+ comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
} else {
- s->dsp.clear_block(t->block);
- decode_block_intra(t, t->block);
- idct_put(t, t->block, s->mb_x, s->mb_y, j);
+ s->bdsp.clear_block(s->block);
+ decode_block_intra(s, s->block);
+ idct_put(s, frame, s->block, s->mb_x, s->mb_y, j);
}
}
}
-static void calc_intra_matrix(MadContext *t, int qscale)
+static void calc_quant_matrix(MadContext *s, int qscale)
{
- MpegEncContext *s = &t->s;
int i;
- if (s->avctx->idct_algo == FF_IDCT_EA) {
- s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
- for (i=1; i<64; i++)
- s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
- } else {
- s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
- for (i=1; i<64; i++)
- s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale) << 1;
- }
+ s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
+ for (i=1; i<64; i++)
+ s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
}
static int decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
+ void *data, int *got_frame,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
- const uint8_t *buf_end = buf+buf_size;
- MadContext *t = avctx->priv_data;
- MpegEncContext *s = &t->s;
+ MadContext *s = avctx->priv_data;
+ AVFrame *frame = data;
+ GetByteContext gb;
+ int width, height;
int chunk_type;
- int inter;
+ int inter, ret;
- if (buf_size < 17) {
- av_log(avctx, AV_LOG_ERROR, "Input buffer too small\n");
- *data_size = 0;
- return -1;
- }
+ bytestream2_init(&gb, buf, buf_size);
- chunk_type = AV_RL32(&buf[0]);
+ chunk_type = bytestream2_get_le32(&gb);
inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
- buf += 8;
-
- av_reduce(&avctx->time_base.num, &avctx->time_base.den,
- AV_RL16(&buf[6]), 1000, 1<<30);
-
- s->width = AV_RL16(&buf[8]);
- s->height = AV_RL16(&buf[10]);
- calc_intra_matrix(t, buf[13]);
- buf += 16;
-
- if (avctx->width != s->width || avctx->height != s->height) {
- if (av_image_check_size(s->width, s->height, 0, avctx) < 0)
- return -1;
- avcodec_set_dimensions(avctx, s->width, s->height);
- if (t->frame.data[0])
- avctx->release_buffer(avctx, &t->frame);
+ bytestream2_skip(&gb, 10);
+
+ av_reduce(&avctx->framerate.den, &avctx->framerate.num,
+ bytestream2_get_le16(&gb), 1000, 1<<30);
+
+ width = bytestream2_get_le16(&gb);
+ height = bytestream2_get_le16(&gb);
+ bytestream2_skip(&gb, 1);
+ calc_quant_matrix(s, bytestream2_get_byte(&gb));
+ bytestream2_skip(&gb, 2);
+
+ if (bytestream2_get_bytes_left(&gb) < 2) {
+ av_log(avctx, AV_LOG_ERROR, "Input data too small\n");
+ return AVERROR_INVALIDDATA;
}
- t->frame.reference = 1;
- if (!t->frame.data[0]) {
- if (avctx->get_buffer(avctx, &t->frame) < 0) {
- av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
- return -1;
- }
+ if (avctx->width != width || avctx->height != height) {
+ av_frame_unref(s->last_frame);
+ if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
+ return ret;
}
- av_fast_malloc(&t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE);
- if (!t->bitstream_buf)
+ if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
+ }
+
+ if (inter && !s->last_frame->data[0]) {
+ av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n");
+ ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF);
+ if (ret < 0)
+ return ret;
+ memset(s->last_frame->data[0], 0, s->last_frame->height *
+ s->last_frame->linesize[0]);
+ memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 *
+ s->last_frame->linesize[1]);
+ memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 *
+ s->last_frame->linesize[2]);
+ }
+
+ av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size,
+ bytestream2_get_bytes_left(&gb));
+ if (!s->bitstream_buf)
return AVERROR(ENOMEM);
- bswap16_buf(t->bitstream_buf, (const uint16_t*)buf, (buf_end-buf)/2);
- init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
+ s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)),
+ bytestream2_get_bytes_left(&gb) / 2);
+ bitstream_init8(&s->bc, s->bitstream_buf, bytestream2_get_bytes_left(&gb));
for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
- decode_mb(t, inter);
+ decode_mb(s, frame, inter);
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = t->frame;
+ *got_frame = 1;
- if (chunk_type != MADe_TAG)
- FFSWAP(AVFrame, t->frame, t->last_frame);
+ if (chunk_type != MADe_TAG) {
+ av_frame_unref(s->last_frame);
+ if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
+ return ret;
+ }
return buf_size;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
MadContext *t = avctx->priv_data;
- if (t->frame.data[0])
- avctx->release_buffer(avctx, &t->frame);
- if (t->last_frame.data[0])
- avctx->release_buffer(avctx, &t->last_frame);
+ av_frame_free(&t->last_frame);
av_free(t->bitstream_buf);
return 0;
}
AVCodec ff_eamad_decoder = {
- "eamad",
- AVMEDIA_TYPE_VIDEO,
- CODEC_ID_MAD,
- sizeof(MadContext),
- decode_init,
- NULL,
- decode_end,
- decode_frame,
- CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video")
+ .name = "eamad",
+ .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts Madcow Video"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_MAD,
+ .priv_data_size = sizeof(MadContext),
+ .init = decode_init,
+ .close = decode_end,
+ .decode = decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
};
projects / ffmpeg / blobdiff