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FFmpeg/libavcodec/imm5.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks 
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

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/*
* Copyright (c) 2019 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 "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "codec_internal.h"
typedef struct IMM5Context {
AVCodecContext *h264_avctx; // wrapper context for H264
AVCodecContext *hevc_avctx; // wrapper context for HEVC
} IMM5Context;
static const struct IMM5_unit {
uint8_t bits[14];
uint8_t len;
} IMM5_units[14] = {
{ { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x0B, 0x0F, 0x88 }, 12 },
{ { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x05, 0x83, 0xE2 }, 12 },
{ { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x05, 0x81, 0xE8, 0x80 }, 13 },
{ { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x0B, 0x04, 0xA2 }, 12 },
{ { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x05, 0x81, 0x28, 0x80 }, 13 },
{ { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x80, 0x1E, 0xF4, 0x05, 0x80, 0x92, 0x20 }, 13 },
{ { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x0B, 0x0F, 0xC8 }, 13 },
{ { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x05, 0x83, 0xF2 }, 13 },
{ { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x05, 0x81, 0xEC, 0x80 }, 14 },
{ { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x0B, 0x04, 0xB2 }, 13 },
{ { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x05, 0x81, 0x2C, 0x80 }, 14 },
{ { 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1E, 0x9A, 0x74, 0x05, 0x80, 0x93, 0x20 }, 14 },
{ { 0x00, 0x00, 0x00, 0x01, 0x68, 0xDE, 0x3C, 0x80 }, 8 },
{ { 0x00, 0x00, 0x00, 0x01, 0x68, 0xCE, 0x32, 0x28 }, 8 },
};
static av_cold int imm5_init(AVCodecContext *avctx)
{
IMM5Context *ctx = avctx->priv_data;
const AVCodec *codec;
int ret;
codec = avcodec_find_decoder(AV_CODEC_ID_H264);
if (!codec)
return AVERROR_BUG;
ctx->h264_avctx = avcodec_alloc_context3(codec);
if (!ctx->h264_avctx)
return AVERROR(ENOMEM);
ctx->h264_avctx->thread_count = 1;
ctx->h264_avctx->flags = avctx->flags;
ctx->h264_avctx->flags2 = avctx->flags2;
ret = avcodec_open2(ctx->h264_avctx, codec, NULL);
if (ret < 0)
return ret;
codec = avcodec_find_decoder(AV_CODEC_ID_HEVC);
if (!codec)
return AVERROR_BUG;
ctx->hevc_avctx = avcodec_alloc_context3(codec);
if (!ctx->hevc_avctx)
return AVERROR(ENOMEM);
ctx->hevc_avctx->thread_count = 1;
ctx->hevc_avctx->flags = avctx->flags;
ctx->hevc_avctx->flags2 = avctx->flags2;
ret = avcodec_open2(ctx->hevc_avctx, codec, NULL);
if (ret < 0)
return ret;
return 0;
}
static int imm5_decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame, AVPacket *avpkt)
{
IMM5Context *ctx = avctx->priv_data;
AVCodecContext *codec_avctx = ctx->h264_avctx;
int ret;
if (avpkt->size > 24 && avpkt->data[8] <= 1 && AV_RL32(avpkt->data + 4) + 24ULL <= avpkt->size) {
int codec_type = avpkt->data[1];
int index = avpkt->data[10];
int new_size = AV_RL32(avpkt->data + 4);
int offset, off;
if (codec_type == 0xA) {
codec_avctx = ctx->hevc_avctx;
} else if (index == 17) {
index = 4;
} else if (index == 18) {
index = 5;
}
if (index >= 1 && index <= 12) {
ret = av_packet_make_writable(avpkt);
if (ret < 0)
return ret;
index -= 1;
off = offset = IMM5_units[index].len;
if (codec_type == 2) {
offset += IMM5_units[12].len;
} else {
offset += IMM5_units[13].len;
}
avpkt->data += 24 - offset;
avpkt->size = new_size + offset;
memcpy(avpkt->data, IMM5_units[index].bits, IMM5_units[index].len);
if (codec_type == 2) {
memcpy(avpkt->data + off, IMM5_units[12].bits, IMM5_units[12].len);
} else {
memcpy(avpkt->data + off, IMM5_units[13].bits, IMM5_units[13].len);
}
} else {
avpkt->data += 24;
avpkt->size -= 24;
}
}
ret = avcodec_send_packet(codec_avctx, avpkt);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
return ret;
}
ret = avcodec_receive_frame(codec_avctx, frame);
if (ret < 0)
return ret;
avctx->pix_fmt = codec_avctx->pix_fmt;
avctx->coded_width = codec_avctx->coded_width;
avctx->coded_height = codec_avctx->coded_height;
avctx->width = codec_avctx->width;
avctx->height = codec_avctx->height;
avctx->bit_rate = codec_avctx->bit_rate;
avctx->colorspace = codec_avctx->colorspace;
avctx->color_range = codec_avctx->color_range;
avctx->color_trc = codec_avctx->color_trc;
avctx->color_primaries = codec_avctx->color_primaries;
avctx->chroma_sample_location = codec_avctx->chroma_sample_location;
*got_frame = 1;
return avpkt->size;
}
static void imm5_flush(AVCodecContext *avctx)
{
IMM5Context *ctx = avctx->priv_data;
avcodec_flush_buffers(ctx->h264_avctx);
avcodec_flush_buffers(ctx->hevc_avctx);
}
static av_cold int imm5_close(AVCodecContext *avctx)
{
IMM5Context *ctx = avctx->priv_data;
avcodec_free_context(&ctx->h264_avctx);
avcodec_free_context(&ctx->hevc_avctx);
return 0;
}
const FFCodec ff_imm5_decoder = {
.p.name = "imm5",
.p.long_name = NULL_IF_CONFIG_SMALL("Infinity IMM5"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_IMM5,
.init = imm5_init,
FF_CODEC_DECODE_CB(imm5_decode_frame),
.close = imm5_close,
.flush = imm5_flush,
.priv_data_size = sizeof(IMM5Context),
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP,
};
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