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FFmpeg/libavcodec/tests/avcodec.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec 
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

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/*
* 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/opt.h"
#include "libavcodec/codec.h"
#include "libavcodec/codec_desc.h"
#include "libavcodec/codec_internal.h"
#include "libavcodec/internal.h"
static const char *get_type_string(enum AVMediaType type)
{
const char *ret = av_get_media_type_string(type);
return ret ? ret : "unknown";
}
#define AV_LOG(...) av_log(NULL, AV_LOG_FATAL, __VA_ARGS__)
#define ERR_INTERNAL(msg, ...) \
do { \
AV_LOG(msg, codec->name __VA_ARGS__); \
ret = 1; \
} while (0)
#define ERR(msg) ERR_INTERNAL(msg, )
#define ERR_EXT(msg, ...) ERR_INTERNAL(msg, , __VA_ARGS__)
static int priv_data_size_wrong(const FFCodec *codec)
{
if (codec->priv_data_size < 0 ||
codec->p.priv_class && codec->priv_data_size < sizeof(AVClass*))
return 1;
if (!codec->p.priv_class || !codec->p.priv_class->option)
return 0;
for (const AVOption *opt = codec->p.priv_class->option; opt->name; opt++) {
if (opt->offset >= codec->priv_data_size ||
opt->type == AV_OPT_TYPE_CONST && opt->offset != 0 ||
opt->type != AV_OPT_TYPE_CONST && (opt->offset < sizeof(AVClass*) || opt->offset < 0)) {
AV_LOG("Option %s offset %d nonsensical\n",
opt->name, opt->offset);
return 1;
}
}
return 0;
}
int main(void){
void *iter = NULL;
const AVCodec *codec = NULL;
int ret = 0;
while (codec = av_codec_iterate(&iter)) {
const FFCodec *const codec2 = ffcodec(codec);
const AVCodecDescriptor *desc;
int is_decoder, is_encoder;
if (!codec->name) {
AV_LOG("Codec for format %s has no name\n",
avcodec_get_name(codec->id));
ret = 1;
continue;
}
if (codec->type != AVMEDIA_TYPE_VIDEO &&
codec->type != AVMEDIA_TYPE_AUDIO &&
codec->type != AVMEDIA_TYPE_SUBTITLE)
ERR_EXT("Codec %s has unsupported type %s\n",
get_type_string(codec->type));
if (codec->type != AVMEDIA_TYPE_AUDIO) {
if (codec->ch_layouts || codec->sample_fmts ||
codec->supported_samplerates)
ERR("Non-audio codec %s has audio-only fields set\n");
if (codec->capabilities & (AV_CODEC_CAP_SMALL_LAST_FRAME |
AV_CODEC_CAP_CHANNEL_CONF |
AV_CODEC_CAP_VARIABLE_FRAME_SIZE))
ERR("Non-audio codec %s has audio-only capabilities set\n");
}
if (codec->type != AVMEDIA_TYPE_VIDEO) {
if (codec->pix_fmts || codec->supported_framerates)
ERR("Non-video codec %s has video-only fields set\n");
if (codec2->caps_internal & FF_CODEC_CAP_EXPORTS_CROPPING)
ERR("Non-video codec %s exports cropping\n");
}
if (codec2->caps_internal & FF_CODEC_CAP_SLICE_THREAD_HAS_MF &&
!(codec->capabilities & AV_CODEC_CAP_SLICE_THREADS))
ERR("Codec %s wants mainfunction despite not being "
"slice-threading capable");
if (codec2->caps_internal & FF_CODEC_CAP_AUTO_THREADS &&
!(codec->capabilities & (AV_CODEC_CAP_FRAME_THREADS |
AV_CODEC_CAP_SLICE_THREADS |
AV_CODEC_CAP_OTHER_THREADS)))
ERR("Codec %s has private-only threading support\n");
is_decoder = av_codec_is_decoder(codec);
is_encoder = av_codec_is_encoder(codec);
if (!!is_decoder + !!is_encoder != 1) {
ERR("Codec %s is decoder and encoder or neither.\n");
continue;
}
if (is_encoder) {
if (codec->type == AVMEDIA_TYPE_SUBTITLE ^ !!codec2->encode_sub)
ERR("Encoder %s is both subtitle encoder and not subtitle encoder.");
if (!!codec2->encode_sub + !!codec2->encode2 + !!codec2->receive_packet != 1)
ERR("Encoder %s does not implement exactly one encode API.\n");
if (codec2->update_thread_context || codec2->update_thread_context_for_user || codec2->bsfs)
ERR("Encoder %s has decoder-only thread functions or bsf.\n");
if (codec->type == AVMEDIA_TYPE_AUDIO) {
if (!codec->sample_fmts) {
av_log(NULL, AV_LOG_FATAL, "Encoder %s is missing the sample_fmts field\n", codec->name);
ret = 1;
}
}
if (codec2->caps_internal & (FF_CODEC_CAP_ALLOCATE_PROGRESS |
FF_CODEC_CAP_SETS_PKT_DTS |
FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
FF_CODEC_CAP_EXPORTS_CROPPING |
FF_CODEC_CAP_SETS_FRAME_PROPS) ||
codec->capabilities & (AV_CODEC_CAP_AVOID_PROBING |
AV_CODEC_CAP_CHANNEL_CONF |
AV_CODEC_CAP_DRAW_HORIZ_BAND |
AV_CODEC_CAP_SUBFRAMES))
ERR("Encoder %s has decoder-only capabilities set\n");
if (codec->capabilities & AV_CODEC_CAP_FRAME_THREADS &&
codec->capabilities & AV_CODEC_CAP_ENCODER_FLUSH)
ERR("Frame-threaded encoder %s claims to support flushing\n");
} else {
if (codec->type == AVMEDIA_TYPE_SUBTITLE && !codec2->decode)
ERR("Subtitle decoder %s does not implement decode callback\n");
if (codec->type == AVMEDIA_TYPE_SUBTITLE && codec2->bsfs)
ERR("Automatic bitstream filtering unsupported for subtitles; "
"yet decoder %s has it set\n");
if (!!codec2->decode + !!codec2->receive_frame != 1)
ERR("Decoder %s does not implement exactly one decode API.\n");
if (codec->capabilities & (AV_CODEC_CAP_SMALL_LAST_FRAME |
AV_CODEC_CAP_VARIABLE_FRAME_SIZE |
AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE |
AV_CODEC_CAP_ENCODER_FLUSH))
ERR("Decoder %s has encoder-only capabilities\n");
if (codec2->caps_internal & FF_CODEC_CAP_ALLOCATE_PROGRESS &&
!(codec->capabilities & AV_CODEC_CAP_FRAME_THREADS))
ERR("Decoder %s wants allocated progress without supporting"
"frame threads\n");
}
if (priv_data_size_wrong(codec2))
ERR_EXT("Private context of codec %s is impossibly-sized (size %d).",
codec2->priv_data_size);
if (!(desc = avcodec_descriptor_get(codec->id))) {
ERR("Codec %s lacks a corresponding descriptor\n");
} else if (desc->type != codec->type)
ERR_EXT("The type of AVCodec %s and its AVCodecDescriptor differ: "
"%s vs %s\n",
get_type_string(codec->type), get_type_string(desc->type));
}
return ret;
}
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