390 lines
13 KiB
C
390 lines
13 KiB
C
/*
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* Copyright (c) 2006 Paul Richards <paul.richards@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* @brief Theora encoder using libtheora.
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* @author Paul Richards <paul.richards@gmail.com>
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*
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* A lot of this is copy / paste from other output codecs in
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* libavcodec or pure guesswork (or both).
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*
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* I have used t_ prefixes on variables which are libtheora types
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* and o_ prefixes on variables which are libogg types.
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*/
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/* FFmpeg includes */
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#include "libavutil/common.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/log.h"
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#include "libavutil/base64.h"
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#include "avcodec.h"
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#include "internal.h"
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/* libtheora includes */
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#include <theora/theoraenc.h>
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typedef struct TheoraContext {
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th_enc_ctx *t_state;
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uint8_t *stats;
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int stats_size;
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int stats_offset;
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int uv_hshift;
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int uv_vshift;
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int keyframe_mask;
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} TheoraContext;
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/** Concatenate an ogg_packet into the extradata. */
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static int concatenate_packet(unsigned int* offset,
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AVCodecContext* avc_context,
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const ogg_packet* packet)
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{
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const char* message = NULL;
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int newsize = avc_context->extradata_size + 2 + packet->bytes;
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int err = AVERROR_INVALIDDATA;
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if (packet->bytes < 0) {
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message = "ogg_packet has negative size";
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} else if (packet->bytes > 0xffff) {
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message = "ogg_packet is larger than 65535 bytes";
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} else if (newsize < avc_context->extradata_size) {
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message = "extradata_size would overflow";
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} else {
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if ((err = av_reallocp(&avc_context->extradata, newsize)) < 0) {
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avc_context->extradata_size = 0;
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message = "av_realloc failed";
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}
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}
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if (message) {
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av_log(avc_context, AV_LOG_ERROR, "concatenate_packet failed: %s\n", message);
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return err;
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}
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avc_context->extradata_size = newsize;
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AV_WB16(avc_context->extradata + (*offset), packet->bytes);
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*offset += 2;
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memcpy(avc_context->extradata + (*offset), packet->packet, packet->bytes);
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(*offset) += packet->bytes;
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return 0;
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}
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static int get_stats(AVCodecContext *avctx, int eos)
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{
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#ifdef TH_ENCCTL_2PASS_OUT
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TheoraContext *h = avctx->priv_data;
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uint8_t *buf;
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int bytes;
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bytes = th_encode_ctl(h->t_state, TH_ENCCTL_2PASS_OUT, &buf, sizeof(buf));
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if (bytes < 0) {
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av_log(avctx, AV_LOG_ERROR, "Error getting first pass stats\n");
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return AVERROR_EXTERNAL;
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}
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if (!eos) {
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void *tmp = av_fast_realloc(h->stats, &h->stats_size,
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h->stats_offset + bytes);
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if (!tmp)
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return AVERROR(ENOMEM);
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h->stats = tmp;
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memcpy(h->stats + h->stats_offset, buf, bytes);
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h->stats_offset += bytes;
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} else {
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int b64_size = AV_BASE64_SIZE(h->stats_offset);
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// libtheora generates a summary header at the end
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memcpy(h->stats, buf, bytes);
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avctx->stats_out = av_malloc(b64_size);
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if (!avctx->stats_out)
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return AVERROR(ENOMEM);
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av_base64_encode(avctx->stats_out, b64_size, h->stats, h->stats_offset);
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}
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return 0;
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#else
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av_log(avctx, AV_LOG_ERROR, "libtheora too old to support 2pass\n");
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return AVERROR(ENOSUP);
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#endif
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}
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// libtheora won't read the entire buffer we give it at once, so we have to
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// repeatedly submit it...
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static int submit_stats(AVCodecContext *avctx)
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{
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#ifdef TH_ENCCTL_2PASS_IN
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TheoraContext *h = avctx->priv_data;
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int bytes;
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if (!h->stats) {
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if (!avctx->stats_in) {
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av_log(avctx, AV_LOG_ERROR, "No statsfile for second pass\n");
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return AVERROR(EINVAL);
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}
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h->stats_size = strlen(avctx->stats_in) * 3/4;
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h->stats = av_malloc(h->stats_size);
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if (!h->stats) {
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h->stats_size = 0;
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return AVERROR(ENOMEM);
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}
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h->stats_size = av_base64_decode(h->stats, avctx->stats_in, h->stats_size);
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}
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while (h->stats_size - h->stats_offset > 0) {
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bytes = th_encode_ctl(h->t_state, TH_ENCCTL_2PASS_IN,
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h->stats + h->stats_offset,
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h->stats_size - h->stats_offset);
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if (bytes < 0) {
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av_log(avctx, AV_LOG_ERROR, "Error submitting stats\n");
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return AVERROR_EXTERNAL;
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}
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if (!bytes)
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return 0;
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h->stats_offset += bytes;
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}
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return 0;
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#else
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av_log(avctx, AV_LOG_ERROR, "libtheora too old to support 2pass\n");
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return AVERROR(ENOSUP);
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#endif
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}
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static av_cold int encode_init(AVCodecContext* avc_context)
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{
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th_info t_info;
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th_comment t_comment;
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ogg_packet o_packet;
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unsigned int offset;
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TheoraContext *h = avc_context->priv_data;
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uint32_t gop_size = avc_context->gop_size;
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int ret;
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/* Set up the theora_info struct */
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th_info_init(&t_info);
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t_info.frame_width = FFALIGN(avc_context->width, 16);
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t_info.frame_height = FFALIGN(avc_context->height, 16);
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t_info.pic_width = avc_context->width;
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t_info.pic_height = avc_context->height;
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t_info.pic_x = 0;
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t_info.pic_y = 0;
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/* Swap numerator and denominator as time_base in AVCodecContext gives the
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* time period between frames, but theora_info needs the framerate. */
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t_info.fps_numerator = avc_context->time_base.den;
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t_info.fps_denominator = avc_context->time_base.num;
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if (avc_context->sample_aspect_ratio.num) {
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t_info.aspect_numerator = avc_context->sample_aspect_ratio.num;
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t_info.aspect_denominator = avc_context->sample_aspect_ratio.den;
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} else {
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t_info.aspect_numerator = 1;
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t_info.aspect_denominator = 1;
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}
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if (avc_context->color_primaries == AVCOL_PRI_BT470M)
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t_info.colorspace = TH_CS_ITU_REC_470M;
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else if (avc_context->color_primaries == AVCOL_PRI_BT470BG)
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t_info.colorspace = TH_CS_ITU_REC_470BG;
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else
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t_info.colorspace = TH_CS_UNSPECIFIED;
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if (avc_context->pix_fmt == AV_PIX_FMT_YUV420P)
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t_info.pixel_fmt = TH_PF_420;
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else if (avc_context->pix_fmt == AV_PIX_FMT_YUV422P)
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t_info.pixel_fmt = TH_PF_422;
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else if (avc_context->pix_fmt == AV_PIX_FMT_YUV444P)
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t_info.pixel_fmt = TH_PF_444;
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else {
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av_log(avc_context, AV_LOG_ERROR, "Unsupported pix_fmt\n");
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return AVERROR(EINVAL);
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}
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ret = av_pix_fmt_get_chroma_sub_sample(avc_context->pix_fmt, &h->uv_hshift, &h->uv_vshift);
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if (ret)
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return ret;
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if (avc_context->flags & AV_CODEC_FLAG_QSCALE) {
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/* Clip global_quality in QP units to the [0 - 10] range
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to be consistent with the libvorbis implementation.
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Theora accepts a quality parameter which is an int value in
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the [0 - 63] range.
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*/
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t_info.quality = av_clipf(avc_context->global_quality / (float)FF_QP2LAMBDA, 0, 10) * 6.3;
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t_info.target_bitrate = 0;
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} else {
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t_info.target_bitrate = avc_context->bit_rate;
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t_info.quality = 0;
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}
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/* Now initialise libtheora */
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h->t_state = th_encode_alloc(&t_info);
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if (!h->t_state) {
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av_log(avc_context, AV_LOG_ERROR, "theora_encode_init failed\n");
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return AVERROR_EXTERNAL;
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}
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h->keyframe_mask = (1 << t_info.keyframe_granule_shift) - 1;
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/* Clear up theora_info struct */
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th_info_clear(&t_info);
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if (th_encode_ctl(h->t_state, TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE,
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&gop_size, sizeof(gop_size))) {
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av_log(avc_context, AV_LOG_ERROR, "Error setting GOP size\n");
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return AVERROR_EXTERNAL;
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}
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// need to enable 2 pass (via TH_ENCCTL_2PASS_) before encoding headers
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if (avc_context->flags & AV_CODEC_FLAG_PASS1) {
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if ((ret = get_stats(avc_context, 0)) < 0)
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return ret;
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} else if (avc_context->flags & AV_CODEC_FLAG_PASS2) {
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if ((ret = submit_stats(avc_context)) < 0)
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return ret;
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}
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/*
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Output first header packet consisting of theora
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header, comment, and tables.
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Each one is prefixed with a 16-bit size, then they
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are concatenated together into libavcodec's extradata.
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*/
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offset = 0;
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/* Headers */
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th_comment_init(&t_comment);
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while (th_encode_flushheader(h->t_state, &t_comment, &o_packet))
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if ((ret = concatenate_packet(&offset, avc_context, &o_packet)) < 0)
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return ret;
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th_comment_clear(&t_comment);
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return 0;
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}
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static int encode_frame(AVCodecContext* avc_context, AVPacket *pkt,
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const AVFrame *frame, int *got_packet)
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{
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th_ycbcr_buffer t_yuv_buffer;
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TheoraContext *h = avc_context->priv_data;
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ogg_packet o_packet;
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int result, i, ret;
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// EOS, finish and get 1st pass stats if applicable
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if (!frame) {
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th_encode_packetout(h->t_state, 1, &o_packet);
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if (avc_context->flags & AV_CODEC_FLAG_PASS1)
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if ((ret = get_stats(avc_context, 1)) < 0)
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return ret;
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return 0;
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}
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/* Copy planes to the theora yuv_buffer */
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for (i = 0; i < 3; i++) {
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t_yuv_buffer[i].width = FFALIGN(avc_context->width, 16) >> (i && h->uv_hshift);
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t_yuv_buffer[i].height = FFALIGN(avc_context->height, 16) >> (i && h->uv_vshift);
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t_yuv_buffer[i].stride = frame->linesize[i];
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t_yuv_buffer[i].data = frame->data[i];
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}
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if (avc_context->flags & AV_CODEC_FLAG_PASS2)
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if ((ret = submit_stats(avc_context)) < 0)
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return ret;
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/* Now call into theora_encode_YUVin */
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result = th_encode_ycbcr_in(h->t_state, t_yuv_buffer);
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if (result) {
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const char* message;
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switch (result) {
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case -1:
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message = "differing frame sizes";
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break;
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case TH_EINVAL:
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message = "encoder is not ready or is finished";
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break;
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default:
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message = "unknown reason";
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break;
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}
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av_log(avc_context, AV_LOG_ERROR, "theora_encode_YUVin failed (%s) [%d]\n", message, result);
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return AVERROR_EXTERNAL;
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}
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if (avc_context->flags & AV_CODEC_FLAG_PASS1)
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if ((ret = get_stats(avc_context, 0)) < 0)
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return ret;
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/* Pick up returned ogg_packet */
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result = th_encode_packetout(h->t_state, 0, &o_packet);
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switch (result) {
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case 0:
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/* No packet is ready */
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return 0;
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case 1:
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/* Success, we have a packet */
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break;
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default:
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av_log(avc_context, AV_LOG_ERROR, "theora_encode_packetout failed [%d]\n", result);
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return AVERROR_EXTERNAL;
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}
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/* Copy ogg_packet content out to buffer */
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if ((ret = ff_alloc_packet2(avc_context, pkt, o_packet.bytes, 0)) < 0)
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return ret;
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memcpy(pkt->data, o_packet.packet, o_packet.bytes);
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// HACK: assumes no encoder delay, this is true until libtheora becomes
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// multithreaded (which will be disabled unless explicitly requested)
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pkt->pts = pkt->dts = frame->pts;
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#if FF_API_CODED_FRAME
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FF_DISABLE_DEPRECATION_WARNINGS
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avc_context->coded_frame->key_frame = !(o_packet.granulepos & h->keyframe_mask);
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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if (!(o_packet.granulepos & h->keyframe_mask))
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pkt->flags |= AV_PKT_FLAG_KEY;
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*got_packet = 1;
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return 0;
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}
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static av_cold int encode_close(AVCodecContext* avc_context)
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{
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TheoraContext *h = avc_context->priv_data;
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th_encode_free(h->t_state);
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av_freep(&h->stats);
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av_freep(&avc_context->stats_out);
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av_freep(&avc_context->extradata);
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avc_context->extradata_size = 0;
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return 0;
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}
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/** AVCodec struct exposed to libavcodec */
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AVCodec ff_libtheora_encoder = {
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.name = "libtheora",
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.long_name = NULL_IF_CONFIG_SMALL("libtheora Theora"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_THEORA,
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.priv_data_size = sizeof(TheoraContext),
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.init = encode_init,
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.close = encode_close,
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.encode2 = encode_frame,
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.capabilities = AV_CODEC_CAP_DELAY, // needed to get the statsfile summary
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.pix_fmts = (const enum AVPixelFormat[]){
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_NONE
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},
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.wrapper_name = "libtheora",
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};
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