/* * 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/fifo.h" #include "libavutil/imgutils.h" #include "libavutil/mem.h" #include "libavutil/opt.h" #include "libavutil/thread.h" #include "avcodec.h" #include "bsf.h" #include "codec_internal.h" #include "decode.h" #include "encode.h" #include "frame_thread_encoder.h" #include "internal.h" #include "thread.h" int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size) { int i; for (i = 0; i < count; i++) { int r = func(c, (char *)arg + i * size); 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); avci = av_mallocz(sizeof(*avci)); 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; } if ((ret = av_opt_set_dict(avctx, options)) < 0) goto free_and_end; 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); ret = AVERROR(EINVAL); 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 }; } } 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; } #if FF_API_OLD_CHANNEL_LAYOUT FF_DISABLE_DEPRECATION_WARNINGS /* compat wrapper for old-style callers */ if (avctx->channel_layout && !avctx->channels) avctx->channels = av_popcount64(avctx->channel_layout); if ((avctx->channels && avctx->ch_layout.nb_channels != avctx->channels) || (avctx->channel_layout && (avctx->ch_layout.order != AV_CHANNEL_ORDER_NATIVE || avctx->ch_layout.u.mask != avctx->channel_layout))) { av_channel_layout_uninit(&avctx->ch_layout); if (avctx->channel_layout) { av_channel_layout_from_mask(&avctx->ch_layout, avctx->channel_layout); } else { avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC; } avctx->ch_layout.nb_channels = avctx->channels; } FF_ENABLE_DEPRECATION_WARNINGS #endif /* 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_number = 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); #if FF_API_OLD_CHANNEL_LAYOUT FF_DISABLE_DEPRECATION_WARNINGS /* update the deprecated fields for old-style callers */ avctx->channels = avctx->ch_layout.nb_channels; avctx->channel_layout = avctx->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ? avctx->ch_layout.u.mask : 0; FF_ENABLE_DEPRECATION_WARNINGS #endif /* 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: avcodec_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; } if (avci->in_frame) av_frame_unref(avci->in_frame); if (avci->recon_frame) av_frame_unref(avci->recon_frame); } else { av_packet_unref(avci->last_pkt_props); av_packet_unref(avci->in_pkt); avctx->pts_correction_last_pts = avctx->pts_correction_last_dts = INT64_MIN; av_bsf_flush(avci->bsf); } avci->draining = 0; avci->draining_done = 0; avci->nb_draining_errors = 0; av_frame_unref(avci->buffer_frame); av_packet_unref(avci->buffer_pkt); if (HAVE_THREADS && avctx->active_thread_type & FF_THREAD_FRAME) 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 int avcodec_close(AVCodecContext *avctx) { int i; if (!avctx) return 0; 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); av_buffer_unref(&avci->pool); if (avctx->hwaccel && avctx->hwaccel->uninit) avctx->hwaccel->uninit(avctx); av_freep(&avci->hwaccel_priv_data); av_bsf_free(&avci->bsf); av_channel_layout_uninit(&avci->initial_ch_layout); #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_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; return 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->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); } else { if (enc->properties & FF_CODEC_PROPERTY_CLOSED_CAPTIONS) av_bprintf(&bprint, ", Closed Captions"); if (enc->properties & FF_CODEC_PROPERTY_FILM_GRAIN) av_bprintf(&bprint, ", Film Grain"); if (enc->properties & FF_CODEC_PROPERTY_LOSSLESS) av_bprintf(&bprint, ", lossless"); } break; case AVMEDIA_TYPE_AUDIO: av_bprintf(&bprint, "%s", separator); if (enc->sample_rate) { av_bprintf(&bprint, "%d Hz, ", enc->sample_rate); } { char buf[512]; int ret = av_channel_layout_describe(&enc->ch_layout, buf, sizeof(buf)); if (ret >= 0) av_bprintf(&bprint, "%s", buf); } 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(AVCodecContext *avctx, AVFrame *frame) { av_frame_unref(frame); if (av_codec_is_decoder(avctx->codec)) return ff_decode_receive_frame(avctx, frame); return ff_encode_receive_frame(avctx, frame); }