[FFmpeg-devel] [PATCH 1/2] avcodec: add IMM4 decoder
Paul B Mahol
onemda at gmail.com
Tue Aug 21 00:13:31 EEST 2018
This work is sponsored by VideoLAN.
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
libavcodec/Makefile | 1 +
libavcodec/allcodecs.c | 1 +
libavcodec/avcodec.h | 1 +
libavcodec/codec_desc.c | 7 +
libavcodec/imm4.c | 501 ++++++++++++++++++++++++++++++++++++++++
libavformat/riff.c | 1 +
6 files changed, 512 insertions(+)
create mode 100644 libavcodec/imm4.c
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 6e40702947..f0c8226283 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -385,6 +385,7 @@ OBJS-$(CONFIG_IDCIN_DECODER) += idcinvideo.o
OBJS-$(CONFIG_IDF_DECODER) += bintext.o cga_data.o
OBJS-$(CONFIG_IFF_ILBM_DECODER) += iff.o
OBJS-$(CONFIG_IMC_DECODER) += imc.o
+OBJS-$(CONFIG_IMM4_DECODER) += imm4.o
OBJS-$(CONFIG_INDEO2_DECODER) += indeo2.o
OBJS-$(CONFIG_INDEO3_DECODER) += indeo3.o
OBJS-$(CONFIG_INDEO4_DECODER) += indeo4.o ivi.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index ab3ec04251..fd35fc1d0b 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -153,6 +153,7 @@ extern AVCodec ff_huffyuv_encoder;
extern AVCodec ff_huffyuv_decoder;
extern AVCodec ff_idcin_decoder;
extern AVCodec ff_iff_ilbm_decoder;
+extern AVCodec ff_imm4_decoder;
extern AVCodec ff_indeo2_decoder;
extern AVCodec ff_indeo3_decoder;
extern AVCodec ff_indeo4_decoder;
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 56be65bd56..31e50d5a94 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -447,6 +447,7 @@ enum AVCodecID {
AV_CODEC_ID_SVG,
AV_CODEC_ID_GDV,
AV_CODEC_ID_FITS,
+ AV_CODEC_ID_IMM4,
/* various PCM "codecs" */
AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
index 1cbb241389..1779149091 100644
--- a/libavcodec/codec_desc.c
+++ b/libavcodec/codec_desc.c
@@ -1654,6 +1654,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
.long_name = NULL_IF_CONFIG_SMALL("FITS (Flexible Image Transport System)"),
.props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSLESS,
},
+ {
+ .id = AV_CODEC_ID_IMM4,
+ .type = AVMEDIA_TYPE_VIDEO,
+ .name = "imm4",
+ .long_name = NULL_IF_CONFIG_SMALL("Infinity IMM4"),
+ .props = AV_CODEC_PROP_LOSSY,
+ },
/* various PCM "codecs" */
{
diff --git a/libavcodec/imm4.c b/libavcodec/imm4.c
new file mode 100644
index 0000000000..4769f352e9
--- /dev/null
+++ b/libavcodec/imm4.c
@@ -0,0 +1,501 @@
+/*
+ * Infinity IMM4 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>
+
+#include "libavutil/thread.h"
+
+#include "avcodec.h"
+#include "bswapdsp.h"
+#include "copy_block.h"
+#include "get_bits.h"
+#include "idctdsp.h"
+#include "internal.h"
+
+typedef struct IMM4Context {
+ BswapDSPContext bdsp;
+ GetBitContext gb;
+
+ AVFrame *prev_frame;
+ uint8_t *bitstream;
+ int bitstream_size;
+
+ int changed_size;
+ int factor;
+ unsigned sindex;
+
+ DECLARE_ALIGNED(32, int16_t, block)[6][64];
+ IDCTDSPContext idsp;
+} IMM4Context;
+
+static const uint8_t intra_cb[] = {
+ 12, 9, 6
+};
+
+static const uint8_t inter_cb[] = {
+ 30, 20, 15
+};
+
+static const uint8_t cbplo_symbols[] = {
+ 3, 4, 19, 20, 35, 36, 51, 52
+};
+
+static const uint8_t cbplo_bits[] = {
+ 1, 4, 3, 6, 3, 6, 3, 6
+};
+
+static const uint8_t cbplo_codes[] = {
+ 1, 1, 1, 1, 2, 2, 3, 3
+};
+
+static const uint8_t cbphi_bits[] = {
+ 4, 5, 5, 4, 5, 4, 6, 4, 5, 6, 4, 4, 4, 4, 4, 2
+};
+
+static const uint8_t cbphi_codes[] = {
+ 3, 5, 4, 9, 3, 7, 2, 11, 2, 3, 5, 10, 4, 8, 6, 3
+};
+
+static const uint8_t blktype_symbols[] = {
+ 0, 1, 2, 3, 4, 16, 17, 18, 19, 20, 32, 33, 34, 35, 48, 50, 51, 52
+};
+
+static const uint8_t blktype_bits[] = {
+ 1, 3, 3, 5, 6, 4, 7, 7, 8, 9, 4, 7, 7, 8, 6, 8, 7, 9
+};
+
+static const uint8_t blktype_codes[] = {
+ 1, 3, 2, 3, 4, 3, 7, 5, 4, 4, 2, 6, 4, 3, 5, 5, 3, 2
+};
+
+static const uint16_t block_symbols[] = {
+ 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xA, 0xB, 0xC, 0x81, 0x82, 0x83,
+ 0x84, 0x85, 0x86, 0x101, 0x102, 0x103, 0x104, 0x181, 0x182, 0x183, 0x201, 0x202,
+ 0x203, 0x281, 0x282, 0x283, 0x301, 0x302, 0x303, 0x381, 0x382, 0x401, 0x402,
+ 0x481, 0x482, 0x501, 0x502, 0x581, 0x601, 0x681, 0x701, 0x781, 0x801, 0x881,
+ 0x901, 0x981, 0xA01, 0xA81, 0xB01, 0xB81, 0xC01, 0xC81, 0xD01, 0x4001, 0x4002,
+ 0x4003, 0x4081, 0x4082, 0x4101, 0x4181, 0x4201, 0x4281, 0x4301, 0x4381, 0x4401,
+ 0x4481, 0x4501, 0x4581, 0x4601, 0x4681, 0x4701, 0x4781, 0x4801, 0x4881, 0x4901,
+ 0x4981, 0x4A01, 0x4A81, 0x4B01, 0x4B81, 0x4C01, 0x4C81, 0x4D01, 0x4D81, 0x4E01,
+ 0x4E81, 0x4F01, 0x4F81, 0x5001, 0x5081, 0x5101, 0x5181, 0x5201, 0x5281, 0x5301,
+ 0x5381, 0x5401
+};
+
+static const uint8_t block_bits[] = {
+ 7, 2, 4, 6, 7, 8, 9, 9, 10, 10, 11, 11, 11, 3, 6, 8, 10, 11, 12, 4, 8,
+ 10, 12, 5, 9, 10, 5, 9, 12, 5, 10, 12, 6, 10, 12, 6, 10, 6, 10, 6,
+ 10, 7, 12, 7, 7, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 11, 11, 12, 12, 4, 9,
+ 11, 6, 11, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9,
+ 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12,
+ 12, 12
+};
+
+static const uint8_t block_codes[] = {
+ 3, 2, 15, 21, 23, 31, 37, 36, 33, 32, 7, 6, 32, 6, 20, 30, 15, 33, 80,
+ 14, 29, 14, 81, 13, 35, 13, 12, 34, 82, 11, 12, 83, 19, 11, 84, 18,
+ 10, 17, 9, 16, 8, 22, 85, 21, 20, 28, 27, 33, 32, 31, 30, 29, 28,
+ 27, 26, 34, 35, 86, 87, 7, 25, 5, 15, 4, 14, 13, 12, 19, 18, 17, 16,
+ 26, 25, 24, 23, 22, 21, 20, 19, 24, 23, 22, 21, 20, 19, 18, 17, 7,
+ 6, 5, 4, 36, 37, 38, 39, 88, 89, 90, 91, 92, 93, 94, 95
+};
+
+static VLC cbplo_tab;
+static VLC cbphi_tab;
+static VLC blktype_tab;
+static VLC block_tab;
+
+static int get_cbphi(GetBitContext *gb, int x)
+{
+ int value;
+
+ value = get_vlc2(gb, cbphi_tab.table, cbphi_tab.bits, 1);
+ if (value < 0)
+ return AVERROR_INVALIDDATA;
+
+ return x ? value : 15 - value;
+}
+
+static int decode_block(AVCodecContext *avctx, GetBitContext *gb,
+ int block, int factor, int flag)
+{
+ IMM4Context *s = avctx->priv_data;
+ int i, last, len, factor2;
+
+ for (i = !flag; i < 64; i++) {
+ int value;
+
+ value = get_vlc2(gb, block_tab.table, block_tab.bits, 1);
+ if (value < 0)
+ return AVERROR_INVALIDDATA;
+ if (value == 0) {
+ last = get_bits1(gb);
+ len = get_bits(gb, 6);
+ factor2 = get_sbits(gb, 8);
+ } else {
+ factor2 = value & 0x7F;
+ last = (value >> 14) & 1;
+ len = (value >> 7) & 0x3F;
+ if (get_bits1(gb))
+ factor2 = -factor2;
+ }
+ i += len;
+ if (i >= 64)
+ break;
+ s->block[block][i] = factor * factor2;
+ if (last)
+ break;
+ }
+
+ return 0;
+}
+
+static int decode_blocks(AVCodecContext *avctx, GetBitContext *gb,
+ unsigned cbp, int flag)
+{
+ IMM4Context *s = avctx->priv_data;
+ int ret, i;
+
+ memset(s->block, 0, sizeof(s->block));
+
+ for (i = 0; i < 6; i++) {
+ if (!flag) {
+ int x = get_bits(gb, 8);
+
+ if (x == 255)
+ x = 128;
+ x *= 8;
+
+ s->block[i][0] = x;
+ }
+
+ if (cbp & (1 << (5 - i))) {
+ ret = decode_block(avctx, gb, i, s->factor, flag);
+ if (ret < 0)
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame)
+{
+ IMM4Context *s = avctx->priv_data;
+ int ret, x, y;
+
+ s->factor = intra_cb[s->sindex] * 2;
+
+ for (y = 0; y < avctx->height; y += 16) {
+ for (x = 0; x < avctx->width; x += 16) {
+ unsigned cbphi, cbplo;
+
+ cbplo = get_vlc2(gb, cbplo_tab.table, cbplo_tab.bits, 1) >> 4;
+ skip_bits1(gb);
+
+ cbphi = get_cbphi(gb, 1);
+
+ ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 0);
+ if (ret < 0)
+ return ret;
+
+ s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
+ frame->linesize[0], s->block[0]);
+ s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
+ frame->linesize[0], s->block[1]);
+ s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
+ frame->linesize[0], s->block[2]);
+ s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
+ frame->linesize[0], s->block[3]);
+ s->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
+ frame->linesize[1], s->block[4]);
+ s->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
+ frame->linesize[2], s->block[5]);
+ }
+ }
+
+ return 0;
+}
+
+static int decode_inter(AVCodecContext *avctx, GetBitContext *gb,
+ AVFrame *frame, AVFrame *prev)
+{
+ IMM4Context *s = avctx->priv_data;
+ int ret, x, y;
+
+ s->factor = inter_cb[s->sindex];
+
+ for (y = 0; y < avctx->height; y += 16) {
+ for (x = 0; x < avctx->width; x += 16) {
+ int reverse, intra_block, value;
+ unsigned cbphi, cbplo;
+
+ if (get_bits1(gb)) {
+ copy_block16(frame->data[0] + y * frame->linesize[0] + x,
+ prev->data[0] + y * prev->linesize[0] + x,
+ frame->linesize[0], prev->linesize[0], 16);
+ copy_block8(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
+ prev->data[1] + (y >> 1) * prev->linesize[1] + (x >> 1),
+ frame->linesize[1], prev->linesize[1], 8);
+ copy_block8(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
+ prev->data[2] + (y >> 1) * prev->linesize[2] + (x >> 1),
+ frame->linesize[2], prev->linesize[2], 8);
+ continue;
+ }
+
+ value = get_vlc2(gb, blktype_tab.table, blktype_tab.bits, 1);
+ if (value < 0)
+ return AVERROR_INVALIDDATA;
+
+ intra_block = value & 0x07;
+ reverse = intra_block == 3;
+ if (reverse)
+ skip_bits1(gb);
+
+ cbplo = value >> 4;
+ cbphi = get_cbphi(gb, reverse);
+ if (intra_block) {
+ ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 0);
+ if (ret < 0)
+ return ret;
+
+ s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
+ frame->linesize[0], s->block[0]);
+ s->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
+ frame->linesize[0], s->block[1]);
+ s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
+ frame->linesize[0], s->block[2]);
+ s->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
+ frame->linesize[0], s->block[3]);
+ s->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
+ frame->linesize[1], s->block[4]);
+ s->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
+ frame->linesize[2], s->block[5]);
+ } else {
+ skip_bits(gb, 2);
+ ret = decode_blocks(avctx, gb, cbplo | (cbphi << 2), 1);
+ if (ret < 0)
+ return ret;
+
+ copy_block16(frame->data[0] + y * frame->linesize[0] + x,
+ prev->data[0] + y * prev->linesize[0] + x,
+ frame->linesize[0], prev->linesize[0], 16);
+ copy_block8(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
+ prev->data[1] + (y >> 1) * prev->linesize[1] + (x >> 1),
+ frame->linesize[1], prev->linesize[1], 8);
+ copy_block8(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
+ prev->data[2] + (y >> 1) * prev->linesize[2] + (x >> 1),
+ frame->linesize[2], prev->linesize[2], 8);
+
+ s->idsp.idct_add(frame->data[0] + y * frame->linesize[0] + x,
+ frame->linesize[0], s->block[0]);
+ s->idsp.idct_add(frame->data[0] + y * frame->linesize[0] + x + 8,
+ frame->linesize[0], s->block[1]);
+ s->idsp.idct_add(frame->data[0] + (y + 8) * frame->linesize[0] + x,
+ frame->linesize[0], s->block[2]);
+ s->idsp.idct_add(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
+ frame->linesize[0], s->block[3]);
+ s->idsp.idct_add(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
+ frame->linesize[1], s->block[4]);
+ s->idsp.idct_add(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
+ frame->linesize[2], s->block[5]);
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame, AVPacket *avpkt)
+{
+ IMM4Context *s = avctx->priv_data;
+ GetBitContext *gb = &s->gb;
+ AVFrame *frame = data;
+ unsigned type;
+ int ret, scaled;
+
+ if (avpkt->size <= 32)
+ return AVERROR_INVALIDDATA;
+
+ av_fast_padded_malloc(&s->bitstream, &s->bitstream_size,
+ FFALIGN(avpkt->size, 4));
+ if (!s->bitstream)
+ return AVERROR(ENOMEM);
+
+ s->bdsp.bswap_buf((uint32_t *)s->bitstream,
+ (uint32_t *)avpkt->data,
+ (avpkt->size + 3) >> 2);
+
+ if ((ret = init_get_bits8(gb, s->bitstream, FFALIGN(avpkt->size, 4))) < 0)
+ return ret;
+
+ avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+ avctx->color_range = AVCOL_RANGE_JPEG;
+
+ scaled = avpkt->data[8];
+ if (scaled < 2) {
+ int width, height;
+ int mode = avpkt->data[10];
+
+ switch (mode) {
+ case 1:
+ width = 352;
+ height = 240;
+ break;
+ case 2:
+ width = 704;
+ height = 240;
+ break;
+ case 4:
+ width = 480;
+ height = 704;
+ break;
+ case 17:
+ width = 352;
+ height = 288;
+ break;
+ case 18:
+ width = 704;
+ height = 288;
+ break;
+ default:
+ width = 704;
+ height = 576;
+ break;
+ }
+
+ if (s->changed_size == 1 &&
+ (avctx->width != width || avctx->height != height)) {
+ av_log(avctx, AV_LOG_ERROR, "Frame size change is unsupported.\n");
+ return AVERROR_INVALIDDATA;
+ }
+ avctx->width = width;
+ avctx->height = height;
+ }
+
+ s->changed_size = 1;
+ skip_bits_long(gb, 24 * 8);
+ type = get_bits_long(gb, 32);
+ s->sindex = get_bits_long(gb, 32);
+ if (s->sindex > 2)
+ return AVERROR_INVALIDDATA;
+
+ switch (type) {
+ case 0x19781977:
+ frame->key_frame = 1;
+ frame->pict_type = AV_PICTURE_TYPE_I;
+ break;
+ case 0x12250926:
+ frame->key_frame = 0;
+ frame->pict_type = AV_PICTURE_TYPE_P;
+ break;
+ default:
+ avpriv_request_sample(avctx, "type %X", type);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ if ((ret = ff_get_buffer(avctx, frame, frame->key_frame ? AV_GET_BUFFER_FLAG_REF : 0)) < 0)
+ return ret;
+
+ if (frame->key_frame) {
+ ret = decode_intra(avctx, gb, frame);
+ if (ret < 0)
+ return ret;
+
+ av_frame_unref(s->prev_frame);
+ if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
+ return ret;
+ } else {
+ if (!s->prev_frame->data[0]) {
+ av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ ret = decode_inter(avctx, gb, frame, s->prev_frame);
+ if (ret < 0)
+ return ret;
+ }
+
+ *got_frame = 1;
+
+ return avpkt->size;
+}
+
+static av_cold void imm4_init_static_data(void)
+{
+ INIT_VLC_SPARSE_STATIC(&cbplo_tab, 9, FF_ARRAY_ELEMS(cbplo_bits),
+ cbplo_bits, 1, 1, cbplo_codes, 1, 1, cbplo_symbols, 1, 1, 512);
+
+ INIT_VLC_SPARSE_STATIC(&cbphi_tab, 6, FF_ARRAY_ELEMS(cbphi_bits),
+ cbphi_bits, 1, 1, cbphi_codes, 1, 1, NULL, 0, 0, 64);
+
+ INIT_VLC_SPARSE_STATIC(&blktype_tab, 9, FF_ARRAY_ELEMS(blktype_bits),
+ blktype_bits, 1, 1, blktype_codes, 1, 1, blktype_symbols, 1, 1, 512);
+
+ INIT_VLC_SPARSE_STATIC(&block_tab, 12, FF_ARRAY_ELEMS(block_bits),
+ block_bits, 1, 1, block_codes, 1, 1, block_symbols, 2, 2, 4096);
+}
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+ static AVOnce init_static_once = AV_ONCE_INIT;
+ IMM4Context *s = avctx->priv_data;
+
+ avctx->idct_algo = FF_IDCT_FAAN;
+ ff_bswapdsp_init(&s->bdsp);
+ ff_idctdsp_init(&s->idsp, avctx);
+
+ s->prev_frame = av_frame_alloc();
+ if (!s->prev_frame)
+ return AVERROR(ENOMEM);
+
+ ff_thread_once(&init_static_once, imm4_init_static_data);
+
+ return 0;
+}
+
+static av_cold int decode_close(AVCodecContext *avctx)
+{
+ IMM4Context *s = avctx->priv_data;
+
+ av_frame_free(&s->prev_frame);
+ av_freep(&s->bitstream);
+ s->bitstream_size = 0;
+
+ return 0;
+}
+
+AVCodec ff_imm4_decoder = {
+ .name = "imm4",
+ .long_name = NULL_IF_CONFIG_SMALL("Infinity IMM4"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_IMM4,
+ .priv_data_size = sizeof(IMM4Context),
+ .init = decode_init,
+ .close = decode_close,
+ .decode = decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
+ .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
+ FF_CODEC_CAP_INIT_CLEANUP,
+};
diff --git a/libavformat/riff.c b/libavformat/riff.c
index 111e408912..3e14644c46 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -470,6 +470,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
{ AV_CODEC_ID_AV1, MKTAG('A', 'V', '0', '1') },
{ AV_CODEC_ID_MSCC, MKTAG('M', 'S', 'C', 'C') },
{ AV_CODEC_ID_SRGC, MKTAG('S', 'R', 'G', 'C') },
+ { AV_CODEC_ID_IMM4, MKTAG('I', 'M', 'M', '4') },
{ AV_CODEC_ID_NONE, 0 }
};
--
2.17.1
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