/* * 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 "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/fifo.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 "encode.h"#include "frame_thread_encoder.h"#include "hwconfig.h"#include "internal.h"#include "refstruct.h"#include "thread.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_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;     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);     if ((ret = av_opt_set_dict(avctx, options)) < 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 = av_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);            }        }        if (codec->priv_class && (ret = av_opt_set_dict(avctx->priv_data, options)) < 0)            goto free_and_end;    } else {        avctx->priv_data = NULL;    }     // 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 };        }    }     if (avctx->sample_rate < 0) {        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",               av_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 = av_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 = av_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 (av_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 (av_codec_is_decoder(avctx->codec)) {        if (!avctx->bit_rate)            avctx->bit_rate = get_bit_rate(avctx);         /* 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 (!avctx)        return;     if (avcodec_is_open(avctx)) {        AVCodecInternal *avci = avctx->internal;         if (CONFIG_FRAME_THREAD_ENCODER &&            avci->frame_thread_encoder && avctx->thread_count > 1) {            ff_frame_thread_encoder_free(avctx);        }        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);         ff_refstruct_unref(&avci->pool);        ff_refstruct_pool_uninit(&avci->progress_frame_pool);         ff_hwaccel_uninit(avctx);         av_bsf_free(&avci->bsf); #if FF_API_DROPCHANGED        av_channel_layout_uninit(&avci->initial_ch_layout);#endif #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;} #if FF_API_AVCODEC_CLOSEint avcodec_close(AVCodecContext *avctx){    ff_codec_close(avctx);    return 0;}#endif static const char *unknown_if_null(const char *str){    return str ? str : "unknown";}

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