avcodec.c

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/*
 * AVCodecContext functions for libavcodec
 *
 * 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
 */
 
/**
 * @file
 * AVCodecContext functions for libavcodec
 */
 
#include <assert.h>
 
#include "config.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/emms.h"
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "avcodec_internal.h"
#include "bsf.h"
#include "codec_desc.h"
#include "codec_internal.h"
#include "decode.h"
#include "frame_thread_encoder.h"
#include "hwconfig.h"
#include "internal.h"
#include "libavutil/refstruct.h"
 
/**
 * Maximum size in bytes of extradata.
 * This value was chosen such that every bit of the buffer is
 * addressable by a 32-bit signed integer as used by get_bits.
 */
#define FF_MAX_EXTRADATA_SIZE ((1 << 28) - AV_INPUT_BUFFER_PADDING_SIZE)
 
const SideDataMap ff_sd_global_map[] = {
    { AV_PKT_DATA_REPLAYGAIN ,                AV_FRAME_DATA_REPLAYGAIN },
    { AV_PKT_DATA_DISPLAYMATRIX,              AV_FRAME_DATA_DISPLAYMATRIX },
    { AV_PKT_DATA_SPHERICAL,                  AV_FRAME_DATA_SPHERICAL },
    { AV_PKT_DATA_STEREO3D,                   AV_FRAME_DATA_STEREO3D },
    { AV_PKT_DATA_AUDIO_SERVICE_TYPE,         AV_FRAME_DATA_AUDIO_SERVICE_TYPE },
    { AV_PKT_DATA_MASTERING_DISPLAY_METADATA, AV_FRAME_DATA_MASTERING_DISPLAY_METADATA },
    { AV_PKT_DATA_CONTENT_LIGHT_LEVEL,        AV_FRAME_DATA_CONTENT_LIGHT_LEVEL },
    { AV_PKT_DATA_ICC_PROFILE,                AV_FRAME_DATA_ICC_PROFILE },
    { AV_PKT_DATA_AMBIENT_VIEWING_ENVIRONMENT,AV_FRAME_DATA_AMBIENT_VIEWING_ENVIRONMENT },
    { AV_PKT_DATA_3D_REFERENCE_DISPLAYS,      AV_FRAME_DATA_3D_REFERENCE_DISPLAYS },
    { AV_PKT_DATA_EXIF,                       AV_FRAME_DATA_EXIF },
    { AV_PKT_DATA_GAIN_MAP_PARAMS,            AV_FRAME_DATA_GAIN_MAP_PARAMS },
    { AV_PKT_DATA_NB },
};
 
 
int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
{
    size_t i;
 
    for (i = 0; i < count; i++) {
        size_t offset = i * size;
        int r = func(c, FF_PTR_ADD((char *)arg, offset));
        if (ret)
            ret[i] = r;
    }
    emms_c();
    return 0;
}
 
int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int jobnr, int threadnr), void *arg, int *ret, int count)
{
    int i;
 
    for (i = 0; i < count; i++) {
        int r = func(c, arg, i, 0);
        if (ret)
            ret[i] = r;
    }
    emms_c();
    return 0;
}
 
static AVMutex codec_mutex = AV_MUTEX_INITIALIZER;
 
static void lock_avcodec(const FFCodec *codec)
{
    if (codec->caps_internal & FF_CODEC_CAP_NOT_INIT_THREADSAFE && codec->init)
        ff_mutex_lock(&codec_mutex);
}
 
static void unlock_avcodec(const FFCodec *codec)
{
    if (codec->caps_internal & FF_CODEC_CAP_NOT_INIT_THREADSAFE && codec->init)
        ff_mutex_unlock(&codec_mutex);
}
 
static int64_t get_bit_rate(AVCodecContext *ctx)
{
    int64_t bit_rate;
    int bits_per_sample;
 
    switch (ctx->codec_type) {
    case AVMEDIA_TYPE_VIDEO:
    case AVMEDIA_TYPE_DATA:
    case AVMEDIA_TYPE_SUBTITLE:
    case AVMEDIA_TYPE_ATTACHMENT:
        bit_rate = ctx->bit_rate;
        break;
    case AVMEDIA_TYPE_AUDIO:
        bits_per_sample = av_get_bits_per_sample(ctx->codec_id);
        if (bits_per_sample) {
            bit_rate = ctx->sample_rate * (int64_t)ctx->ch_layout.nb_channels;
            if (bit_rate > INT64_MAX / bits_per_sample) {
                bit_rate = 0;
            } else
                bit_rate *= bits_per_sample;
        } else
            bit_rate = ctx->bit_rate;
        break;
    default:
        bit_rate = 0;
        break;
    }
    return bit_rate;
}
 
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
{
    int ret = 0;
    AVCodecInternal *avci;
    const FFCodec *codec2;
    const AVDictionaryEntry *e;
 
    if (avcodec_is_open(avctx))
        return 0;
 
    if (!codec && !avctx->codec) {
        av_log(avctx, AV_LOG_ERROR, "No codec provided to avcodec_open2()\n");
        return AVERROR(EINVAL);
    }
    if (codec && avctx->codec && codec != avctx->codec) {
        av_log(avctx, AV_LOG_ERROR, "This AVCodecContext was allocated for %s, "
                                    "but %s passed to avcodec_open2()\n", avctx->codec->name, codec->name);
        return AVERROR(EINVAL);
    }
    if (!codec)
        codec = avctx->codec;
    codec2 = ffcodec(codec);
 
    if ((avctx->codec_type != AVMEDIA_TYPE_UNKNOWN && avctx->codec_type != codec->type) ||
        (avctx->codec_id   != AV_CODEC_ID_NONE     && avctx->codec_id   != codec->id)) {
        av_log(avctx, AV_LOG_ERROR, "Codec type or id mismatches\n");
        return AVERROR(EINVAL);
    }
 
    avctx->codec_type = codec->type;
    avctx->codec_id   = codec->id;
    avctx->codec      = codec;
 
    if (avctx->extradata_size < 0 || avctx->extradata_size >= FF_MAX_EXTRADATA_SIZE)
        return AVERROR(EINVAL);
 
    // set the whitelist from provided options dict,
    // so we can check it immediately
    e = options ? av_dict_get(*options, "codec_whitelist", NULL, 0) : NULL;
    if (e) {
        ret = av_opt_set(avctx, e->key, e->value, 0);
        if (ret < 0)
            return ret;
    }
 
    if (avctx->codec_whitelist && av_match_list(codec->name, avctx->codec_whitelist, ',') <= 0) {
        av_log(avctx, AV_LOG_ERROR, "Codec (%s) not on whitelist \'%s\'\n", codec->name, avctx->codec_whitelist);
        return AVERROR(EINVAL);
    }
 
    avci = ff_codec_is_decoder(codec) ?
        ff_decode_internal_alloc()    :
        ff_encode_internal_alloc();
    if (!avci) {
        ret = AVERROR(ENOMEM);
        goto end;
    }
    avctx->internal = avci;
 
    avci->buffer_frame = av_frame_alloc();
    avci->buffer_pkt = av_packet_alloc();
    if (!avci->buffer_frame || !avci->buffer_pkt) {
        ret = AVERROR(ENOMEM);
        goto free_and_end;
    }
 
    if (codec2->priv_data_size > 0) {
        if (!avctx->priv_data) {
            avctx->priv_data = av_mallocz(codec2->priv_data_size);
            if (!avctx->priv_data) {
                ret = AVERROR(ENOMEM);
                goto free_and_end;
            }
            if (codec->priv_class) {
                *(const AVClass **)avctx->priv_data = codec->priv_class;
                av_opt_set_defaults(avctx->priv_data);
            }
        }
    } else {
        avctx->priv_data = NULL;
    }
 
    ret = av_opt_set_dict2(avctx, options, AV_OPT_SEARCH_CHILDREN);
    if (ret < 0)
        goto free_and_end;
 
    // only call ff_set_dimensions() for non H.264/VP6F/DXV codecs so as not to overwrite previously setup dimensions
    if (!(avctx->coded_width && avctx->coded_height && avctx->width && avctx->height &&
          (avctx->codec_id == AV_CODEC_ID_H264 || avctx->codec_id == AV_CODEC_ID_VP6F || avctx->codec_id == AV_CODEC_ID_DXV))) {
        if (avctx->coded_width && avctx->coded_height)
            ret = ff_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);
        else if (avctx->width && avctx->height)
            ret = ff_set_dimensions(avctx, avctx->width, avctx->height);
        if (ret < 0)
            goto free_and_end;
    }
 
    if ((avctx->coded_width || avctx->coded_height || avctx->width || avctx->height)
        && (  av_image_check_size2(avctx->coded_width, avctx->coded_height, avctx->max_pixels, AV_PIX_FMT_NONE, 0, avctx) < 0
           || av_image_check_size2(avctx->width,       avctx->height,       avctx->max_pixels, AV_PIX_FMT_NONE, 0, avctx) < 0)) {
        av_log(avctx, AV_LOG_WARNING, "Ignoring invalid width/height values\n");
        ff_set_dimensions(avctx, 0, 0);
    }
 
    if (avctx->width > 0 && avctx->height > 0) {
        if (av_image_check_sar(avctx->width, avctx->height,
                               avctx->sample_aspect_ratio) < 0) {
            av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
                   avctx->sample_aspect_ratio.num,
                   avctx->sample_aspect_ratio.den);
            avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
        }
    }
 
    /* AV_CODEC_CAP_CHANNEL_CONF is a decoder-only flag; so the code below
     * in particular checks that sample_rate is set for all audio encoders. */
    if (avctx->sample_rate < 0 ||
        avctx->sample_rate == 0 && avctx->codec_type == AVMEDIA_TYPE_AUDIO &&
        !(codec->capabilities & AV_CODEC_CAP_CHANNEL_CONF)) {
        av_log(avctx, AV_LOG_ERROR, "Invalid sample rate: %d\n", avctx->sample_rate);
        ret = AVERROR(EINVAL);
        goto free_and_end;
    }
    if (avctx->block_align < 0) {
        av_log(avctx, AV_LOG_ERROR, "Invalid block align: %d\n", avctx->block_align);
        ret = AVERROR(EINVAL);
        goto free_and_end;
    }
 
    /* AV_CODEC_CAP_CHANNEL_CONF is a decoder-only flag; so the code below
     * in particular checks that nb_channels is set for all audio encoders. */
    if (avctx->codec_type == AVMEDIA_TYPE_AUDIO && !avctx->ch_layout.nb_channels
        && !(codec->capabilities & AV_CODEC_CAP_CHANNEL_CONF)) {
        av_log(avctx, AV_LOG_ERROR, "%s requires channel layout to be set\n",
               ff_codec_is_decoder(codec) ? "Decoder" : "Encoder");
        ret = AVERROR(EINVAL);
        goto free_and_end;
    }
    if (avctx->ch_layout.nb_channels && !av_channel_layout_check(&avctx->ch_layout)) {
        av_log(avctx, AV_LOG_ERROR, "Invalid channel layout\n");
        ret = AVERROR(EINVAL);
        goto free_and_end;
    }
    if (avctx->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) {
        av_log(avctx, AV_LOG_ERROR, "Too many channels: %d\n", avctx->ch_layout.nb_channels);
        ret = AVERROR(EINVAL);
        goto free_and_end;
    }
 
    avctx->frame_num = 0;
    avctx->codec_descriptor = avcodec_descriptor_get(avctx->codec_id);
 
    if ((avctx->codec->capabilities & AV_CODEC_CAP_EXPERIMENTAL) &&
        avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
        const char *codec_string = ff_codec_is_encoder(codec) ? "encoder" : "decoder";
        const AVCodec *codec2;
        av_log(avctx, AV_LOG_ERROR,
               "The %s '%s' is experimental but experimental codecs are not enabled, "
               "add '-strict %d' if you want to use it.\n",
               codec_string, codec->name, FF_COMPLIANCE_EXPERIMENTAL);
        codec2 = ff_codec_is_encoder(codec) ? avcodec_find_encoder(codec->id) : avcodec_find_decoder(codec->id);
        if (!(codec2->capabilities & AV_CODEC_CAP_EXPERIMENTAL))
            av_log(avctx, AV_LOG_ERROR, "Alternatively use the non experimental %s '%s'.\n",
                codec_string, codec2->name);
        ret = AVERROR_EXPERIMENTAL;
        goto free_and_end;
    }
 
    if (avctx->codec_type == AVMEDIA_TYPE_AUDIO &&
        (!avctx->time_base.num || !avctx->time_base.den)) {
        avctx->time_base.num = 1;
        avctx->time_base.den = avctx->sample_rate;
    }
 
    if (ff_codec_is_encoder(avctx->codec))
        ret = ff_encode_preinit(avctx);
    else
        ret = ff_decode_preinit(avctx);
    if (ret < 0)
        goto free_and_end;
 
    if (HAVE_THREADS && !avci->frame_thread_encoder) {
        /* Frame-threaded decoders call FFCodec.init for their child contexts. */
        lock_avcodec(codec2);
        ret = ff_thread_init(avctx);
        unlock_avcodec(codec2);
        if (ret < 0) {
            goto free_and_end;
        }
    }
    if (!HAVE_THREADS && !(codec2->caps_internal & FF_CODEC_CAP_AUTO_THREADS))
        avctx->thread_count = 1;
 
    if (!(avctx->active_thread_type & FF_THREAD_FRAME) ||
        avci->frame_thread_encoder) {
        if (codec2->init) {
            lock_avcodec(codec2);
            ret = codec2->init(avctx);
            unlock_avcodec(codec2);
            if (ret < 0) {
                avci->needs_close = codec2->caps_internal & FF_CODEC_CAP_INIT_CLEANUP;
                goto free_and_end;
            }
        }
        avci->needs_close = 1;
    }
 
    ret=0;
 
    if (ff_codec_is_decoder(avctx->codec)) {
        if (!avctx->bit_rate)
            avctx->bit_rate = get_bit_rate(avctx);
 
 
        if (avctx->codec_type == AVMEDIA_TYPE_AUDIO &&
            !avctx->frame_size && (avctx->flags2 & AV_CODEC_FLAG2_FIXED_FRAME_SIZE)) {
            av_log(avctx, AV_LOG_ERROR, "Fixed frame size requested but no frame_size value set\n");
            ret = AVERROR(EINVAL);
            goto free_and_end;
        }
 
        avci->skip_samples = avctx->delay;
 
        /* validate channel layout from the decoder */
        if ((avctx->ch_layout.nb_channels && !av_channel_layout_check(&avctx->ch_layout)) ||
            avctx->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) {
            ret = AVERROR(EINVAL);
            goto free_and_end;
        }
        if (avctx->bits_per_coded_sample < 0) {
            ret = AVERROR(EINVAL);
            goto free_and_end;
        }
    }
    if (codec->priv_class)
        av_assert0(*(const AVClass **)avctx->priv_data == codec->priv_class);
 
end:
 
    return ret;
free_and_end:
    ff_codec_close(avctx);
    goto end;
}
 
void avcodec_flush_buffers(AVCodecContext *avctx)
{
    AVCodecInternal *avci = avctx->internal;
 
    if (av_codec_is_encoder(avctx->codec)) {
        int caps = avctx->codec->capabilities;
 
        if (!(caps & AV_CODEC_CAP_ENCODER_FLUSH)) {
            // Only encoders that explicitly declare support for it can be
            // flushed. Otherwise, this is a no-op.
            av_log(avctx, AV_LOG_WARNING, "Ignoring attempt to flush encoder "
                   "that doesn't support it\n");
            return;
        }
        ff_encode_flush_buffers(avctx);
    } else
        ff_decode_flush_buffers(avctx);
 
    avci->draining      = 0;
    avci->draining_done = 0;
    if (avci->buffer_frame)
        av_frame_unref(avci->buffer_frame);
    if (avci->buffer_pkt)
        av_packet_unref(avci->buffer_pkt);
 
    if (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME &&
        !avci->is_frame_mt)
        ff_thread_flush(avctx);
    else if (ffcodec(avctx->codec)->flush)
        ffcodec(avctx->codec)->flush(avctx);
}
 
void avsubtitle_free(AVSubtitle *sub)
{
    int i;
 
    for (i = 0; i < sub->num_rects; i++) {
        AVSubtitleRect *const rect = sub->rects[i];
 
        av_freep(&rect->data[0]);
        av_freep(&rect->data[1]);
        av_freep(&rect->data[2]);
        av_freep(&rect->data[3]);
        av_freep(&rect->text);
        av_freep(&rect->ass);
 
        av_freep(&sub->rects[i]);
    }
 
    av_freep(&sub->rects);
 
    memset(sub, 0, sizeof(*sub));
}
 
av_cold void ff_codec_close(AVCodecContext *avctx)
{
    int i;
 
    if (avcodec_is_open(avctx)) {
        AVCodecInternal *avci = avctx->internal;
 
#if CONFIG_FRAME_THREAD_ENCODER
        if (avci->frame_thread_encoder && avctx->thread_count > 1) {
            ff_frame_thread_encoder_free(avctx);
        }
#endif
        if (HAVE_THREADS && avci->thread_ctx)
            ff_thread_free(avctx);
        if (avci->needs_close && ffcodec(avctx->codec)->close)
            ffcodec(avctx->codec)->close(avctx);
        avci->byte_buffer_size = 0;
        av_freep(&avci->byte_buffer);
        av_frame_free(&avci->buffer_frame);
        av_packet_free(&avci->buffer_pkt);
        av_packet_free(&avci->last_pkt_props);
 
        av_packet_free(&avci->in_pkt);
        av_frame_free(&avci->in_frame);
        av_frame_free(&avci->recon_frame);
 
        av_refstruct_unref(&avci->pool);
        av_refstruct_pool_uninit(&avci->progress_frame_pool);
        if (av_codec_is_decoder(avctx->codec))
            ff_decode_internal_uninit(avctx);
 
        ff_hwaccel_uninit(avctx);
 
        av_bsf_free(&avci->bsf);
 
#if CONFIG_LCMS2
        ff_icc_context_uninit(&avci->icc);
#endif
 
        av_freep(&avctx->internal);
    }
 
    for (i = 0; i < avctx->nb_coded_side_data; i++)
        av_freep(&avctx->coded_side_data[i].data);
    av_freep(&avctx->coded_side_data);
    avctx->nb_coded_side_data = 0;
    av_frame_side_data_free(&avctx->decoded_side_data,
                            &avctx->nb_decoded_side_data);
 
    av_buffer_unref(&avctx->hw_frames_ctx);
    av_buffer_unref(&avctx->hw_device_ctx);
 
    if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
        av_opt_free(avctx->priv_data);
    av_opt_free(avctx);
    av_freep(&avctx->priv_data);
    if (av_codec_is_encoder(avctx->codec)) {
        av_freep(&avctx->extradata);
        avctx->extradata_size = 0;
    } else if (av_codec_is_decoder(avctx->codec))
        av_freep(&avctx->subtitle_header);
 
    avctx->codec = NULL;
    avctx->active_thread_type = 0;
}
 
static const char *unknown_if_null(const char *str)
{
    return str ? str : "unknown";
}
 
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
{
    const char *codec_type;
    const char *codec_name;
    const char *profile = NULL;
    AVBPrint bprint;
    int64_t bitrate;
    int new_line = 0;
    AVRational display_aspect_ratio;
    const char *separator = enc->dump_separator ? (const char *)enc->dump_separator : ", ";
    const char *str;
 
    if (!buf || buf_size <= 0)
        return;
    av_bprint_init_for_buffer(&bprint, buf, buf_size);
    codec_type = av_get_media_type_string(enc->codec_type);
    codec_name = avcodec_get_name(enc->codec_id);
    profile = avcodec_profile_name(enc->codec_id, enc->profile);
 
    av_bprintf(&bprint, "%s: %s", codec_type ? codec_type : "unknown",
               codec_name);
    buf[0] ^= 'a' ^ 'A'; /* first letter in uppercase */
 
    if (enc->codec && strcmp(enc->codec->name, codec_name))
        av_bprintf(&bprint, " (%s)", enc->codec->name);
 
    if (profile)
        av_bprintf(&bprint, " (%s)", profile);
    if (   enc->codec_type == AVMEDIA_TYPE_VIDEO
        && av_log_get_level() >= AV_LOG_VERBOSE
        && enc->refs)
        av_bprintf(&bprint, ", %d reference frame%s",
                   enc->refs, enc->refs > 1 ? "s" : "");
 
    if (enc->codec_tag)
        av_bprintf(&bprint, " (%s / 0x%04X)",
                   av_fourcc2str(enc->codec_tag), enc->codec_tag);
 
    switch (enc->codec_type) {
    case AVMEDIA_TYPE_VIDEO:
        {
            unsigned len;
 
            av_bprintf(&bprint, "%s%s", separator,
                       enc->pix_fmt == AV_PIX_FMT_NONE ? "none" :
                       unknown_if_null(av_get_pix_fmt_name(enc->pix_fmt)));
 
            av_bprint_chars(&bprint, '(', 1);
            len = bprint.len;
 
            /* The following check ensures that '(' has been written
             * and therefore allows us to erase it if it turns out
             * to be unnecessary. */
            if (!av_bprint_is_complete(&bprint))
                return;
 
            if (enc->bits_per_raw_sample && enc->pix_fmt != AV_PIX_FMT_NONE &&
                enc->bits_per_raw_sample < av_pix_fmt_desc_get(enc->pix_fmt)->comp[0].depth)
                av_bprintf(&bprint, "%d bpc, ", enc->bits_per_raw_sample);
            if (enc->color_range != AVCOL_RANGE_UNSPECIFIED &&
                (str = av_color_range_name(enc->color_range)))
                av_bprintf(&bprint, "%s, ", str);
 
            if (enc->colorspace != AVCOL_SPC_UNSPECIFIED ||
                enc->color_primaries != AVCOL_PRI_UNSPECIFIED ||
                enc->color_trc != AVCOL_TRC_UNSPECIFIED) {
                const char *col = unknown_if_null(av_color_space_name(enc->colorspace));
                const char *pri = unknown_if_null(av_color_primaries_name(enc->color_primaries));
                const char *trc = unknown_if_null(av_color_transfer_name(enc->color_trc));
                if (strcmp(col, pri) || strcmp(col, trc)) {
                    new_line = 1;
                    av_bprintf(&bprint, "%s/%s/%s, ", col, pri, trc);
                } else
                    av_bprintf(&bprint, "%s, ", col);
            }
 
            if (enc->field_order != AV_FIELD_UNKNOWN) {
                const char *field_order = "progressive";
                if (enc->field_order == AV_FIELD_TT)
                    field_order = "top first";
                else if (enc->field_order == AV_FIELD_BB)
                    field_order = "bottom first";
                else if (enc->field_order == AV_FIELD_TB)
                    field_order = "top coded first (swapped)";
                else if (enc->field_order == AV_FIELD_BT)
                    field_order = "bottom coded first (swapped)";
 
                av_bprintf(&bprint, "%s, ", field_order);
            }
 
            if (av_log_get_level() >= AV_LOG_VERBOSE &&
                enc->chroma_sample_location != AVCHROMA_LOC_UNSPECIFIED &&
                (str = av_chroma_location_name(enc->chroma_sample_location)))
                av_bprintf(&bprint, "%s, ", str);
 
            if (len == bprint.len) {
                bprint.str[len - 1] = '\0';
                bprint.len--;
            } else {
                if (bprint.len - 2 < bprint.size) {
                    /* Erase the last ", " */
                    bprint.len -= 2;
                    bprint.str[bprint.len] = '\0';
                }
                av_bprint_chars(&bprint, ')', 1);
            }
        }
 
        if (enc->width) {
            av_bprintf(&bprint, "%s%dx%d", new_line ? separator : ", ",
                       enc->width, enc->height);
 
            if (av_log_get_level() >= AV_LOG_VERBOSE &&
                enc->coded_width && enc->coded_height &&
                (enc->width != enc->coded_width ||
                 enc->height != enc->coded_height))
                av_bprintf(&bprint, " (%dx%d)",
                           enc->coded_width, enc->coded_height);
 
            if (enc->sample_aspect_ratio.num) {
                av_reduce(&display_aspect_ratio.num, &display_aspect_ratio.den,
                          enc->width * (int64_t)enc->sample_aspect_ratio.num,
                          enc->height * (int64_t)enc->sample_aspect_ratio.den,
                          1024 * 1024);
                av_bprintf(&bprint, " [SAR %d:%d DAR %d:%d]",
                         enc->sample_aspect_ratio.num, enc->sample_aspect_ratio.den,
                         display_aspect_ratio.num, display_aspect_ratio.den);
            }
            if (av_log_get_level() >= AV_LOG_DEBUG) {
                int g = av_gcd(enc->time_base.num, enc->time_base.den);
                av_bprintf(&bprint, ", %d/%d",
                           enc->time_base.num / g, enc->time_base.den / g);
            }
        }
        if (encode) {
            av_bprintf(&bprint, ", q=%d-%d", enc->qmin, enc->qmax);
        }
        break;
    case AVMEDIA_TYPE_AUDIO:
        av_bprintf(&bprint, "%s", separator);
 
        if (enc->sample_rate) {
            av_bprintf(&bprint, "%d Hz, ", enc->sample_rate);
        }
        av_channel_layout_describe_bprint(&enc->ch_layout, &bprint);
        if (enc->sample_fmt != AV_SAMPLE_FMT_NONE &&
            (str = av_get_sample_fmt_name(enc->sample_fmt))) {
            av_bprintf(&bprint, ", %s", str);
        }
        if (   enc->bits_per_raw_sample > 0
            && enc->bits_per_raw_sample != av_get_bytes_per_sample(enc->sample_fmt) * 8)
            av_bprintf(&bprint, " (%d bit)", enc->bits_per_raw_sample);
        if (av_log_get_level() >= AV_LOG_VERBOSE) {
            if (enc->initial_padding)
                av_bprintf(&bprint, ", delay %d", enc->initial_padding);
            if (enc->trailing_padding)
                av_bprintf(&bprint, ", padding %d", enc->trailing_padding);
        }
        break;
    case AVMEDIA_TYPE_DATA:
        if (av_log_get_level() >= AV_LOG_DEBUG) {
            int g = av_gcd(enc->time_base.num, enc->time_base.den);
            if (g)
                av_bprintf(&bprint, ", %d/%d",
                           enc->time_base.num / g, enc->time_base.den / g);
        }
        break;
    case AVMEDIA_TYPE_SUBTITLE:
        if (enc->width)
            av_bprintf(&bprint, ", %dx%d", enc->width, enc->height);
        break;
    default:
        return;
    }
    if (encode) {
        if (enc->flags & AV_CODEC_FLAG_PASS1)
            av_bprintf(&bprint, ", pass 1");
        if (enc->flags & AV_CODEC_FLAG_PASS2)
            av_bprintf(&bprint, ", pass 2");
    }
    bitrate = get_bit_rate(enc);
    if (bitrate != 0) {
        av_bprintf(&bprint, ", %"PRId64" kb/s", bitrate / 1000);
    } else if (enc->rc_max_rate > 0) {
        av_bprintf(&bprint, ", max. %"PRId64" kb/s", enc->rc_max_rate / 1000);
    }
}
 
int avcodec_is_open(AVCodecContext *s)
{
    return !!s->internal;
}
 
int attribute_align_arg avcodec_receive_frame_flags(AVCodecContext *avctx,
                                               AVFrame *frame, unsigned flags)
{
    av_frame_unref(frame);
 
    if (!avcodec_is_open(avctx) || !avctx->codec)
        return AVERROR(EINVAL);
 
    if (ff_codec_is_decoder(avctx->codec))
        return ff_decode_receive_frame(avctx, frame, flags);
    return ff_encode_receive_frame(avctx, frame);
}
 
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
{
    return avcodec_receive_frame_flags(avctx, frame, 0);
}
 
#define WRAP_CONFIG(allowed_type, field, var, field_type, sentinel_check)   \
    do {                                                                    \
        if (codec->type != (allowed_type))                                  \
            return AVERROR(EINVAL);                                         \
        const field_type *ptr = codec2->field;                              \
        *out_configs = ptr;                                                 \
        if (ptr) {                                                          \
            for (int i = 0;; i++) {                                         \
                const field_type var = ptr[i];                              \
                if (sentinel_check) {                                       \
                    *out_num_configs = i;                                   \
                    break;                                                  \
                }                                                           \
            }                                                               \
        } else                                                              \
            *out_num_configs = 0;                                           \
        return 0;                                                           \
    } while (0)
 
static const enum AVColorRange color_range_tab[] = {
    AVCOL_RANGE_MPEG, AVCOL_RANGE_JPEG, AVCOL_RANGE_UNSPECIFIED,
    AVCOL_RANGE_MPEG, AVCOL_RANGE_UNSPECIFIED,
};
 
static const enum AVAlphaMode alpha_mode_tab[] = {
    AVALPHA_MODE_PREMULTIPLIED, AVALPHA_MODE_STRAIGHT, AVALPHA_MODE_UNSPECIFIED,
    AVALPHA_MODE_PREMULTIPLIED, AVALPHA_MODE_UNSPECIFIED
};
 
static_assert((int)AVCOL_RANGE_MPEG == (int)AVALPHA_MODE_PREMULTIPLIED, "unexpected enum values");
static_assert((int)AVCOL_RANGE_JPEG == (int)AVALPHA_MODE_STRAIGHT, "unexpected enum values");
static_assert(AVCOL_RANGE_UNSPECIFIED == 0 && AVALPHA_MODE_UNSPECIFIED == 0, "unexpected enum values");
static_assert(AVCOL_RANGE_NB == 3 && AVALPHA_MODE_NB == 3, "unexpected enum values");
 
static const uint8_t offset_tab[] = {
    [AVCOL_RANGE_MPEG] = 3,
    [AVCOL_RANGE_JPEG] = 1,
    [AVCOL_RANGE_MPEG | AVCOL_RANGE_JPEG] = 0,
};
 
int ff_default_get_supported_config(const AVCodecContext *avctx,
                                    const AVCodec *codec,
                                    enum AVCodecConfig config,
                                    unsigned flags,
                                    const void **out_configs,
                                    int *out_num_configs)
{
    const FFCodec *codec2 = ffcodec(codec);
 
    switch (config) {
    case AV_CODEC_CONFIG_PIX_FORMAT:
        WRAP_CONFIG(AVMEDIA_TYPE_VIDEO, pix_fmts, pix_fmt, enum AVPixelFormat, pix_fmt == AV_PIX_FMT_NONE);
    case AV_CODEC_CONFIG_FRAME_RATE:
        WRAP_CONFIG(AVMEDIA_TYPE_VIDEO, supported_framerates, framerate, AVRational, framerate.num == 0);
    case AV_CODEC_CONFIG_SAMPLE_RATE:
        WRAP_CONFIG(AVMEDIA_TYPE_AUDIO, supported_samplerates, samplerate, int, samplerate == 0);
    case AV_CODEC_CONFIG_SAMPLE_FORMAT:
        WRAP_CONFIG(AVMEDIA_TYPE_AUDIO, sample_fmts, sample_fmt, enum AVSampleFormat, sample_fmt == AV_SAMPLE_FMT_NONE);
    case AV_CODEC_CONFIG_CHANNEL_LAYOUT:
        WRAP_CONFIG(AVMEDIA_TYPE_AUDIO, ch_layouts, ch_layout, AVChannelLayout, ch_layout.nb_channels == 0);
 
    case AV_CODEC_CONFIG_COLOR_RANGE:
        if (codec->type != AVMEDIA_TYPE_VIDEO)
            return AVERROR(EINVAL);
        unsigned color_ranges = codec2->color_ranges;
        if (color_ranges)
            *out_configs = color_range_tab + offset_tab[color_ranges];
        else
            *out_configs = NULL;
        *out_num_configs = av_popcount(color_ranges);
        return 0;
 
    case AV_CODEC_CONFIG_COLOR_SPACE:
        *out_configs = NULL;
        *out_num_configs = 0;
        return 0;
 
    case AV_CODEC_CONFIG_ALPHA_MODE:
        if (codec->type != AVMEDIA_TYPE_VIDEO)
            return AVERROR(EINVAL);
        unsigned alpha_modes = codec2->alpha_modes;
        if (alpha_modes)
            *out_configs = alpha_mode_tab + offset_tab[alpha_modes];
        else
            *out_configs = NULL;
        *out_num_configs = av_popcount(alpha_modes);
        return 0;
 
    case AV_CODEC_CONFIG_CHROMA_LOCATION:
        WRAP_CONFIG(AVMEDIA_TYPE_VIDEO, chroma_locations, loc,
                    enum AVChromaLocation, loc == AVCHROMA_LOC_UNSPECIFIED);
 
    default:
        return AVERROR(EINVAL);
    }
}
 
int avcodec_get_supported_config(const AVCodecContext *avctx, const AVCodec *codec,
                                 enum AVCodecConfig config, unsigned flags,
                                 const void **out, int *out_num)
{
    const FFCodec *codec2;
    int dummy_num = 0;
    if (!codec)
        codec = avctx->codec;
    if (!out_num)
        out_num = &dummy_num;
 
    codec2 = ffcodec(codec);
    if (codec2->get_supported_config) {
        return codec2->get_supported_config(avctx, codec, config, flags, out, out_num);
    } else {
        return ff_default_get_supported_config(avctx, codec, config, flags, out, out_num);
    }
}
 
int av_packet_side_data_from_frame(AVPacketSideData **psd, int *pnb_sd,
                                   const AVFrameSideData *src, unsigned int flags)
{
    AVPacketSideData *sd = NULL;
 
    for (unsigned j = 0; ff_sd_global_map[j].packet < AV_PKT_DATA_NB; j++) {
        if (ff_sd_global_map[j].frame != src->type)
            continue;
 
        sd = av_packet_side_data_new(psd, pnb_sd, ff_sd_global_map[j].packet,
                                     src->size, 0);
 
        if (!sd)
            return AVERROR(ENOMEM);
 
        memcpy(sd->data, src->data, src->size);
        break;
    }
 
    if (!sd)
        return AVERROR(EINVAL);
 
    return 0;
}
 
int av_packet_side_data_to_frame(AVFrameSideData ***psd, int *pnb_sd,
                                 const AVPacketSideData *src, unsigned int flags)
{
    AVFrameSideData *sd = NULL;
 
    for (unsigned j = 0; ff_sd_global_map[j].packet < AV_PKT_DATA_NB; j++) {
        if (ff_sd_global_map[j].packet != src->type)
            continue;
 
        sd = av_frame_side_data_new(psd, pnb_sd, ff_sd_global_map[j].frame,
                                    src->size, flags);
 
        if (!sd)
            return AVERROR(ENOMEM);
 
        memcpy(sd->data, src->data, src->size);
        break;
    }
 
    if (!sd)
        return AVERROR(EINVAL);
 
    return 0;
}