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avcodec: add Amuse Graphics decoder

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This work is sponsored by VideoLAN.
pull/310/head
Paul B Mahol 6 years ago
parent 52d8f35b14
commit 4e8cbbf70e
8 changed files with 668 additions and 2 deletions
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  1. 1
      Changelog
  2. 1
      libavcodec/Makefile
  3. 653
      libavcodec/agm.c
  4. 1
      libavcodec/allcodecs.c
  5. 1
      libavcodec/avcodec.h
  6. 7
      libavcodec/codec_desc.c
  7. 4
      libavcodec/version.h
  8. 2
      libavformat/riff.c

1
Changelog
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@ -20,6 +20,7 @@ version <next>:
- libaribb24 based ARIB STD-B24 caption support (profiles A and C)
- Support decoding of HEVC 4:4:4 content in nvdec and cuviddec
- removed libndi-newtek
- agm decoder
version 4.1:

1
libavcodec/Makefile
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@ -173,6 +173,7 @@ OBJS-$(CONFIG_AC3_FIXED_DECODER) += ac3dec_fixed.o ac3dec_data.o ac3.o kbd
OBJS-$(CONFIG_AC3_ENCODER) += ac3enc_float.o ac3enc.o ac3tab.o \
ac3.o kbdwin.o
OBJS-$(CONFIG_AC3_FIXED_ENCODER) += ac3enc_fixed.o ac3enc.o ac3tab.o ac3.o
OBJS-$(CONFIG_AGM_DECODER) += agm.o
OBJS-$(CONFIG_AIC_DECODER) += aic.o
OBJS-$(CONFIG_ALAC_DECODER) += alac.o alac_data.o alacdsp.o
OBJS-$(CONFIG_ALAC_ENCODER) += alacenc.o alac_data.o

653
libavcodec/agm.c
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@ -0,0 +1,653 @@
/*
* Amuse Graphics Movie decoder
*
* Copyright (c) 2018 Paul B Mahol
*
* 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 2.1 of the License, or (at your option) any later version.
*
* 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BITSTREAM_READER_LE
#include "avcodec.h"
#include "bytestream.h"
#include "copy_block.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "internal.h"
static const uint8_t unscaled_luma[64] = {
16, 11, 10, 16, 24, 40, 51, 61, 12, 12, 14, 19,
26, 58, 60, 55, 14, 13, 16, 24, 40, 57, 69, 56,
14, 17, 22, 29, 51, 87, 80, 62, 18, 22, 37, 56,
68,109,103, 77, 24, 35, 55, 64, 81,104,113, 92,
49, 64, 78, 87,103,121,120,101, 72, 92, 95, 98,
112,100,103,99
};
static const uint8_t unscaled_chroma[64] = {
17, 18, 24, 47, 99, 99, 99, 99, 18, 21, 26, 66,
99, 99, 99, 99, 24, 26, 56, 99, 99, 99, 99, 99,
47, 66, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99
};
typedef struct MotionVector {
int16_t x, y;
} MotionVector;
typedef struct AGMContext {
const AVClass *class;
AVCodecContext *avctx;
GetBitContext gb;
GetByteContext gbyte;
int key_frame;
int bitstream_size;
int compression;
int blocks_w;
int blocks_h;
int size[3];
int plus;
unsigned flags;
unsigned fflags;
MotionVector *mvectors;
int mvectors_size;
AVFrame *prev_frame;
int luma_quant_matrix[64];
int chroma_quant_matrix[64];
ScanTable scantable;
DECLARE_ALIGNED(32, int16_t, block)[64];
IDCTDSPContext idsp;
} AGMContext;
static int read_code(GetBitContext *gb, int *oskip, int *level, int *map, int mode)
{
int len = 0, skip = 0, max;
if (show_bits(gb, 2)) {
switch (show_bits(gb, 4)) {
case 1:
case 9:
len = 1;
skip = 3;
break;
case 2:
len = 3;
skip = 4;
break;
case 3:
len = 7;
skip = 4;
break;
case 5:
case 13:
len = 2;
skip = 3;
break;
case 6:
len = 4;
skip = 4;
break;
case 7:
len = 8;
skip = 4;
break;
case 10:
len = 5;
skip = 4;
break;
case 11:
len = 9;
skip = 4;
break;
case 14:
len = 6;
skip = 4;
break;
case 15:
len = ((show_bits(gb, 5) & 0x10) | 0xA0) >> 4;
skip = 5;
break;
default:
return AVERROR_INVALIDDATA;
}
skip_bits(gb, skip);
*level = get_bits(gb, len);
*map = 1;
*oskip = 0;
max = 1 << (len - 1);
if (*level < max)
*level = -(max + *level);
} else if (show_bits(gb, 3) & 4) {
skip_bits(gb, 3);
if (mode == 1) {
if (show_bits(gb, 4)) {
if (show_bits(gb, 4) == 1) {
skip_bits(gb, 4);
*oskip = get_bits(gb, 16);
} else {
*oskip = get_bits(gb, 4);
}
} else {
skip_bits(gb, 4);
*oskip = get_bits(gb, 10);
}
} else if (mode == 0) {
*oskip = get_bits(gb, 10);
}
*level = 0;
} else {
skip_bits(gb, 3);
if (mode == 0)
*oskip = get_bits(gb, 4);
else if (mode == 1)
*oskip = 0;
*level = 0;
}
return 0;
}
static int decode_intra_block(AGMContext *s, GetBitContext *gb, int size,
const int *quant_matrix, int *skip, int *dc_level)
{
const uint8_t *scantable = s->scantable.permutated;
const int offset = s->plus ? 0 : 1024;
int16_t *block = s->block;
int level, ret, map = 0;
memset(block, 0, sizeof(s->block));
if (*skip > 0) {
(*skip)--;
} else {
ret = read_code(gb, skip, &level, &map, s->flags & 1);
if (ret < 0)
return ret;
*dc_level += level;
}
block[scantable[0]] = offset + *dc_level * quant_matrix[0];
for (int i = 1; i < 64;) {
if (*skip > 0) {
int rskip;
rskip = FFMIN(*skip, 64 - i);
i += rskip;
*skip -= rskip;
} else {
ret = read_code(gb, skip, &level, &map, s->flags & 1);
if (ret < 0)
return ret;
block[scantable[i]] = level * quant_matrix[i];
i++;
}
}
return 0;
}
static int decode_intra_plane(AGMContext *s, GetBitContext *gb, int size,
const int *quant_matrix, AVFrame *frame,
int plane)
{
int ret, skip = 0, dc_level = 0;
if ((ret = init_get_bits8(gb, s->gbyte.buffer, size)) < 0)
return ret;
for (int y = 0; y < s->blocks_h; y++) {
for (int x = 0; x < s->blocks_w; x++) {
ret = decode_intra_block(s, gb, size, quant_matrix, &skip, &dc_level);
if (ret < 0)
return ret;
s->idsp.idct_put(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
frame->linesize[plane], s->block);
}
}
align_get_bits(gb);
if (get_bits_left(gb) < 0)
av_log(s->avctx, AV_LOG_WARNING, "overread\n");
if (get_bits_left(gb) > 0)
av_log(s->avctx, AV_LOG_WARNING, "underread: %d\n", get_bits_left(gb));
return 0;
}
static int decode_inter_block(AGMContext *s, GetBitContext *gb, int size,
const int *quant_matrix, int *skip,
int *map)
{
const uint8_t *scantable = s->scantable.permutated;
int16_t *block = s->block;
int level, ret;
memset(block, 0, sizeof(s->block));
for (int i = 0; i < 64;) {
if (*skip > 0) {
int rskip;
rskip = FFMIN(*skip, 64 - i);
i += rskip;
*skip -= rskip;
} else {
ret = read_code(gb, skip, &level, map, s->flags & 1);
if (ret < 0)
return ret;
block[scantable[i]] = level * quant_matrix[i];
i++;
}
}
return 0;
}
static int decode_inter_plane(AGMContext *s, GetBitContext *gb, int size,
const int *quant_matrix, AVFrame *frame,
AVFrame *prev, int plane)
{
int ret, skip = 0;
if ((ret = init_get_bits8(gb, s->gbyte.buffer, size)) < 0)
return ret;
if (s->flags & 2) {
for (int y = 0; y < s->blocks_h; y++) {
for (int x = 0; x < s->blocks_w; x++) {
int shift = plane == 0;
int mvpos = (y >> shift) * (s->blocks_w >> shift) + (x >> shift);
int orig_mv_x = s->mvectors[mvpos].x;
int mv_x = s->mvectors[mvpos].x / (1 + !shift);
int mv_y = s->mvectors[mvpos].y / (1 + !shift);
int h = s->avctx->coded_height >> !shift;
int w = s->avctx->coded_width >> !shift;
int map = 0;
ret = decode_inter_block(s, gb, size, quant_matrix, &skip, &map);
if (ret < 0)
return ret;
if (orig_mv_x >= -32) {
if (y * 8 + mv_y < 0 || y * 8 + mv_y >= h ||
x * 8 + mv_x < 0 || x * 8 + mv_x >= w)
return AVERROR_INVALIDDATA;
copy_block8(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
prev->data[plane] + ((s->blocks_h - 1 - y) * 8 - mv_y) * prev->linesize[plane] + (x * 8 + mv_x),
frame->linesize[plane], prev->linesize[plane], 8);
if (map) {
s->idsp.idct(s->block);
for (int i = 0; i < 64; i++)
s->block[i] = (s->block[i] + 1) & 0xFFFC;
s->idsp.add_pixels_clamped(s->block, frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
frame->linesize[plane]);
}
} else if (map) {
s->idsp.idct_put(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
frame->linesize[plane], s->block);
}
}
}
} else {
for (int y = 0; y < s->blocks_h; y++) {
for (int x = 0; x < s->blocks_w; x++) {
int map = 0;
ret = decode_inter_block(s, gb, size, quant_matrix, &skip, &map);
if (ret < 0)
return ret;
if (!map)
continue;
s->idsp.idct_add(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
frame->linesize[plane], s->block);
}
}
}
align_get_bits(gb);
if (get_bits_left(gb) < 0)
av_log(s->avctx, AV_LOG_WARNING, "overread\n");
if (get_bits_left(gb) > 0)
av_log(s->avctx, AV_LOG_WARNING, "underread: %d\n", get_bits_left(gb));
return 0;
}
static void compute_quant_matrix(AGMContext *s, double qscale)
{
int luma[64], chroma[64];
double f = 1.0 - fabs(qscale);
if (!s->key_frame && (s->flags & 2)) {
if (qscale >= 0.0) {
for (int i = 0; i < 64; i++) {
luma[i] = FFMAX(1, 16 * f);
chroma[i] = FFMAX(1, 16 * f);
}
} else {
for (int i = 0; i < 64; i++) {
luma[i] = FFMAX(1, 16 - qscale * 32);
chroma[i] = FFMAX(1, 16 - qscale * 32);
}
}
} else {
if (qscale >= 0.0) {
for (int i = 0; i < 64; i++) {
luma[i] = FFMAX(1, unscaled_luma [(i & 7) * 8 + (i >> 3)] * f);
chroma[i] = FFMAX(1, unscaled_chroma[(i & 7) * 8 + (i >> 3)] * f);
}
} else {
for (int i = 0; i < 64; i++) {
luma[i] = FFMAX(1, 255.0 - (255 - unscaled_luma [(i & 7) * 8 + (i >> 3)]) * f);
chroma[i] = FFMAX(1, 255.0 - (255 - unscaled_chroma[(i & 7) * 8 + (i >> 3)]) * f);
}
}
}
for (int i = 0; i < 64; i++) {
int pos = ff_zigzag_direct[i];
s->luma_quant_matrix[i] = luma[pos] * ((pos / 8) & 1 ? -1 : 1);
s->chroma_quant_matrix[i] = chroma[pos] * ((pos / 8) & 1 ? -1 : 1);
}
}
static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame)
{
AGMContext *s = avctx->priv_data;
int ret;
compute_quant_matrix(s, (2 * s->compression - 100) / 100.0);
s->blocks_w = avctx->coded_width >> 3;
s->blocks_h = avctx->coded_height >> 3;
ret = decode_intra_plane(s, gb, s->size[0], s->luma_quant_matrix, frame, 0);
if (ret < 0)
return ret;
bytestream2_skip(&s->gbyte, s->size[0]);
s->blocks_w = avctx->coded_width >> 4;
s->blocks_h = avctx->coded_height >> 4;
ret = decode_intra_plane(s, gb, s->size[1], s->chroma_quant_matrix, frame, 2);
if (ret < 0)
return ret;
bytestream2_skip(&s->gbyte, s->size[1]);
s->blocks_w = avctx->coded_width >> 4;
s->blocks_h = avctx->coded_height >> 4;
ret = decode_intra_plane(s, gb, s->size[2], s->chroma_quant_matrix, frame, 1);
if (ret < 0)
return ret;
return 0;
}
static int decode_motion_vectors(AVCodecContext *avctx, GetBitContext *gb)
{
AGMContext *s = avctx->priv_data;
int nb_mvs = ((avctx->height + 15) >> 4) * ((avctx->width + 15) >> 4);
int ret, skip = 0, value, map;
av_fast_padded_malloc(&s->mvectors, &s->mvectors_size,
nb_mvs * sizeof(*s->mvectors));
if (!s->mvectors)
return AVERROR(ENOMEM);
if ((ret = init_get_bits8(gb, s->gbyte.buffer, bytestream2_get_bytes_left(&s->gbyte) -
(s->size[0] + s->size[1] + s->size[2]))) < 0)
return ret;
memset(s->mvectors, 0, sizeof(*s->mvectors) * nb_mvs);
for (int i = 0; i < nb_mvs; i++) {
ret = read_code(gb, &skip, &value, &map, 1);
if (ret < 0)
return ret;
s->mvectors[i].x = value;
i += skip;
}
for (int i = 0; i < nb_mvs; i++) {
ret = read_code(gb, &skip, &value, &map, 1);
if (ret < 0)
return ret;
s->mvectors[i].y = value;
i += skip;
}
if (get_bits_left(gb) <= 0)
return AVERROR_INVALIDDATA;
skip = (get_bits_count(gb) >> 3) + 1;
bytestream2_skip(&s->gbyte, skip);
return 0;
}
static int decode_inter(AVCodecContext *avctx, GetBitContext *gb,
AVFrame *frame, AVFrame *prev)
{
AGMContext *s = avctx->priv_data;
int ret;
compute_quant_matrix(s, (2 * s->compression - 100) / 100.0);
if (s->flags & 2) {
ret = decode_motion_vectors(avctx, gb);
if (ret < 0)
return ret;
}
s->blocks_w = avctx->coded_width >> 3;
s->blocks_h = avctx->coded_height >> 3;
ret = decode_inter_plane(s, gb, s->size[0], s->luma_quant_matrix, frame, prev, 0);
if (ret < 0)
return ret;
bytestream2_skip(&s->gbyte, s->size[0]);
s->blocks_w = avctx->coded_width >> 4;
s->blocks_h = avctx->coded_height >> 4;
ret = decode_inter_plane(s, gb, s->size[1], s->chroma_quant_matrix, frame, prev, 2);
if (ret < 0)
return ret;
bytestream2_skip(&s->gbyte, s->size[1]);
s->blocks_w = avctx->coded_width >> 4;
s->blocks_h = avctx->coded_height >> 4;
ret = decode_inter_plane(s, gb, s->size[2], s->chroma_quant_matrix, frame, prev, 1);
if (ret < 0)
return ret;
return 0;
}
static int decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
AGMContext *s = avctx->priv_data;
GetBitContext *gb = &s->gb;
GetByteContext *gbyte = &s->gbyte;
AVFrame *frame = data;
int w, h, width, height, header;
int ret;
if (!avpkt->size)
return 0;
bytestream2_init(gbyte, avpkt->data, avpkt->size);
header = bytestream2_get_le32(gbyte);
s->fflags = bytestream2_get_le32(gbyte);
s->bitstream_size = s->fflags & 0x1FFFFFFF;
s->fflags >>= 29;
av_log(avctx, AV_LOG_DEBUG, "fflags: %X\n", s->fflags);
if (avpkt->size < s->bitstream_size + 8)
return AVERROR_INVALIDDATA;
s->key_frame = s->fflags & 0x1;
frame->key_frame = s->key_frame;
frame->pict_type = s->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
if (header) {
av_log(avctx, AV_LOG_ERROR, "header: %X\n", header);
return AVERROR_PATCHWELCOME;
}
s->flags = 0;
w = bytestream2_get_le32(gbyte);
if (w < 0) {
w = -w;
s->flags |= 2;
}
h = bytestream2_get_le32(gbyte);
if (h < 0) {
h = -h;
s->flags |= 1;
}
width = avctx->width;
height = avctx->height;
if (w < width || h < height || w & 7 || h & 7)
return AVERROR_INVALIDDATA;
ret = ff_set_dimensions(avctx, w, h);
if (ret < 0)
return ret;
avctx->width = width;
avctx->height = height;
s->compression = bytestream2_get_le32(gbyte);
if (s->compression < 0 || s->compression > 100)
return AVERROR_INVALIDDATA;
for (int i = 0; i < 3; i++)
s->size[i] = bytestream2_get_le32(gbyte);
if (32LL + s->size[0] + s->size[1] + s->size[2] > avpkt->size)
return AVERROR_INVALIDDATA;
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
return ret;
if (frame->key_frame) {
ret = decode_intra(avctx, gb, frame);
} else {
if (!s->prev_frame->data[0]) {
av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
return AVERROR_INVALIDDATA;
}
if (!(s->flags & 2)) {
ret = av_frame_copy(frame, s->prev_frame);
if (ret < 0)
return ret;
}
ret = decode_inter(avctx, gb, frame, s->prev_frame);
}
if (ret < 0)
return ret;
av_frame_unref(s->prev_frame);
if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
return ret;
frame->crop_top = avctx->coded_height - avctx->height;
frame->crop_left = avctx->coded_width - avctx->width;
*got_frame = 1;
return avpkt->size;
}
static av_cold int decode_init(AVCodecContext *avctx)
{
AGMContext *s = avctx->priv_data;
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
s->avctx = avctx;
s->plus = avctx->codec_tag == MKTAG('A', 'G', 'M', '3');
avctx->idct_algo = FF_IDCT_SIMPLE;
ff_idctdsp_init(&s->idsp, avctx);
ff_init_scantable(s->idsp.idct_permutation, &s->scantable, ff_zigzag_direct);
s->prev_frame = av_frame_alloc();
if (!s->prev_frame)
return AVERROR(ENOMEM);
return 0;
}
static void decode_flush(AVCodecContext *avctx)
{
AGMContext *s = avctx->priv_data;
av_frame_unref(s->prev_frame);
}
static av_cold int decode_close(AVCodecContext *avctx)
{
AGMContext *s = avctx->priv_data;
av_frame_free(&s->prev_frame);
av_freep(&s->mvectors);
s->mvectors_size = 0;
return 0;
}
AVCodec ff_agm_decoder = {
.name = "agm",
.long_name = NULL_IF_CONFIG_SMALL("Amuse Graphics Movie"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_AGM,
.priv_data_size = sizeof(AGMContext),
.init = decode_init,
.close = decode_close,
.decode = decode_frame,
.flush = decode_flush,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP |
FF_CODEC_CAP_EXPORTS_CROPPING,
};

1
libavcodec/allcodecs.c
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@ -35,6 +35,7 @@ extern AVCodec ff_aasc_decoder;
extern AVCodec ff_aic_decoder;
extern AVCodec ff_alias_pix_encoder;
extern AVCodec ff_alias_pix_decoder;
extern AVCodec ff_agm_decoder;
extern AVCodec ff_amv_encoder;
extern AVCodec ff_amv_decoder;
extern AVCodec ff_anm_decoder;

1
libavcodec/avcodec.h
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@ -454,6 +454,7 @@ enum AVCodecID {
AV_CODEC_ID_RASC,
AV_CODEC_ID_HYMT,
AV_CODEC_ID_ARBC,
AV_CODEC_ID_AGM,
/* various PCM "codecs" */
AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs

7
libavcodec/codec_desc.c
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@ -1705,6 +1705,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
.long_name = NULL_IF_CONFIG_SMALL("Gryphon's Anim Compressor"),
.props = AV_CODEC_PROP_LOSSY,
},
{
.id = AV_CODEC_ID_AGM,
.type = AVMEDIA_TYPE_VIDEO,
.name = "agm",
.long_name = NULL_IF_CONFIG_SMALL("Amuse Graphics Movie"),
.props = AV_CODEC_PROP_LOSSY,
},
/* various PCM "codecs" */
{

4
libavcodec/version.h
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@ -28,8 +28,8 @@
#include "libavutil/version.h"
#define LIBAVCODEC_VERSION_MAJOR 58
#define LIBAVCODEC_VERSION_MINOR 47
#define LIBAVCODEC_VERSION_MICRO 106
#define LIBAVCODEC_VERSION_MINOR 48
#define LIBAVCODEC_VERSION_MICRO 100
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \

2
libavformat/riff.c
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@ -477,6 +477,8 @@ const AVCodecTag ff_codec_bmp_tags[] = {
{ AV_CODEC_ID_RASC, MKTAG('R', 'A', 'S', 'C') },
{ AV_CODEC_ID_HYMT, MKTAG('H', 'Y', 'M', 'T') },
{ AV_CODEC_ID_ARBC, MKTAG('A', 'R', 'B', 'C') },
{ AV_CODEC_ID_AGM, MKTAG('A', 'G', 'M', '2') },
{ AV_CODEC_ID_AGM, MKTAG('A', 'G', 'M', '3') },
{ AV_CODEC_ID_NONE, 0 }
};

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