FFmpeg/libavcodec/asvenc.c

/*
 * Copyright (c) 2003 Michael Niedermayer
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * ASUS V1/V2 encoder.
 */

#include "libavutil/attributes.h"
#include "libavutil/mem.h"

#include "asv.h"
#include "avcodec.h"
#include "fdctdsp.h"
#include "mathops.h"
#include "mpeg12data.h"

static inline void asv2_put_bits(PutBitContext *pb, int n, int v)
{
    put_bits(pb, n, ff_reverse[v << (8 - n)]);
}

static inline void asv1_put_level(PutBitContext *pb, int level)
{
    unsigned int index = level + 3;

    if (index <= 6) {
        put_bits(pb, ff_asv_level_tab[index][1], ff_asv_level_tab[index][0]);
    } else {
        put_bits(pb, ff_asv_level_tab[3][1], ff_asv_level_tab[3][0]);
        put_sbits(pb, 8, level);
    }
}

static inline void asv2_put_level(PutBitContext *pb, int level)
{
    unsigned int index = level + 31;

    if (index <= 62) {
        put_bits(pb, ff_asv2_level_tab[index][1], ff_asv2_level_tab[index][0]);
    } else {
        put_bits(pb, ff_asv2_level_tab[31][1], ff_asv2_level_tab[31][0]);
        asv2_put_bits(pb, 8, level & 0xFF);
    }
}

static inline void asv1_encode_block(ASV1Context *a, int16_t block[64])
{
    int i;
    int nc_count = 0;

    put_bits(&a->pb, 8, (block[0] + 32) >> 6);
    block[0] = 0;

    for (i = 0; i < 10; i++) {
        const int index = ff_asv_scantab[4 * i];
        int ccp         = 0;

        if ((block[index + 0] = (block[index + 0] *
                                 a->q_intra_matrix[index + 0] + (1 << 15)) >> 16))
            ccp |= 8;
        if ((block[index + 8] = (block[index + 8] *
                                 a->q_intra_matrix[index + 8] + (1 << 15)) >> 16))
            ccp |= 4;
        if ((block[index + 1] = (block[index + 1] *
                                 a->q_intra_matrix[index + 1] + (1 << 15)) >> 16))
            ccp |= 2;
        if ((block[index + 9] = (block[index + 9] *
                                 a->q_intra_matrix[index + 9] + (1 << 15)) >> 16))
            ccp |= 1;

        if (ccp) {
            for (; nc_count; nc_count--)
                put_bits(&a->pb, ff_asv_ccp_tab[0][1], ff_asv_ccp_tab[0][0]);

            put_bits(&a->pb, ff_asv_ccp_tab[ccp][1], ff_asv_ccp_tab[ccp][0]);

            if (ccp & 8)
                asv1_put_level(&a->pb, block[index + 0]);
            if (ccp & 4)
                asv1_put_level(&a->pb, block[index + 8]);
            if (ccp & 2)
                asv1_put_level(&a->pb, block[index + 1]);
            if (ccp & 1)
                asv1_put_level(&a->pb, block[index + 9]);
        } else {
            nc_count++;
        }
    }
    put_bits(&a->pb, ff_asv_ccp_tab[16][1], ff_asv_ccp_tab[16][0]);
}

static inline void asv2_encode_block(ASV1Context *a, int16_t block[64])
{
    int i;
    int count = 0;

    for (count = 63; count > 3; count--) {
        const int index = ff_asv_scantab[count];
        if ((block[index] * a->q_intra_matrix[index] + (1 << 15)) >> 16)
            break;
    }

    count >>= 2;

    asv2_put_bits(&a->pb, 4, count);
    asv2_put_bits(&a->pb, 8, (block[0] + 32) >> 6);
    block[0] = 0;

    for (i = 0; i <= count; i++) {
        const int index = ff_asv_scantab[4 * i];
        int ccp         = 0;

        if ((block[index + 0] = (block[index + 0] *
                                 a->q_intra_matrix[index + 0] + (1 << 15)) >> 16))
            ccp |= 8;
        if ((block[index + 8] = (block[index + 8] *
                                 a->q_intra_matrix[index + 8] + (1 << 15)) >> 16))
            ccp |= 4;
        if ((block[index + 1] = (block[index + 1] *
                                 a->q_intra_matrix[index + 1] + (1 << 15)) >> 16))
            ccp |= 2;
        if ((block[index + 9] = (block[index + 9] *
                                 a->q_intra_matrix[index + 9] + (1 << 15)) >> 16))
            ccp |= 1;

        assert(i || ccp < 8);
        if (i)
            put_bits(&a->pb, ff_asv_ac_ccp_tab[ccp][1], ff_asv_ac_ccp_tab[ccp][0]);
        else
            put_bits(&a->pb, ff_asv_dc_ccp_tab[ccp][1], ff_asv_dc_ccp_tab[ccp][0]);

        if (ccp) {
            if (ccp & 8)
                asv2_put_level(&a->pb, block[index + 0]);
            if (ccp & 4)
                asv2_put_level(&a->pb, block[index + 8]);
            if (ccp & 2)
                asv2_put_level(&a->pb, block[index + 1]);
            if (ccp & 1)
                asv2_put_level(&a->pb, block[index + 9]);
        }
    }
}

#define MAX_MB_SIZE (30 * 16 * 16 * 3 / 2 / 8)

static inline int encode_mb(ASV1Context *a, int16_t block[6][64])
{
    int i;

    if (a->pb.buf_end - a->pb.buf - (put_bits_count(&a->pb) >> 3) < MAX_MB_SIZE) {
        av_log(a->avctx, AV_LOG_ERROR, "encoded frame too large\n");
        return -1;
    }

    if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
        for (i = 0; i < 6; i++)
            asv1_encode_block(a, block[i]);
    } else {
        for (i = 0; i < 6; i++)
            asv2_encode_block(a, block[i]);
    }
    return 0;
}

static inline void dct_get(ASV1Context *a, const AVFrame *frame,
                           int mb_x, int mb_y)
{
    int16_t (*block)[64] = a->block;
    int linesize = frame->linesize[0];
    int i;

    uint8_t *ptr_y  = frame->data[0] + (mb_y * 16 * linesize)           + mb_x * 16;
    uint8_t *ptr_cb = frame->data[1] + (mb_y *  8 * frame->linesize[1]) + mb_x *  8;
    uint8_t *ptr_cr = frame->data[2] + (mb_y *  8 * frame->linesize[2]) + mb_x *  8;

    a->pdsp.get_pixels(block[0], ptr_y,                    linesize);
    a->pdsp.get_pixels(block[1], ptr_y + 8,                linesize);
    a->pdsp.get_pixels(block[2], ptr_y + 8 * linesize,     linesize);
    a->pdsp.get_pixels(block[3], ptr_y + 8 * linesize + 8, linesize);
    for (i = 0; i < 4; i++)
        a->fdsp.fdct(block[i]);

    if (!(a->avctx->flags & CODEC_FLAG_GRAY)) {
        a->pdsp.get_pixels(block[4], ptr_cb, frame->linesize[1]);
        a->pdsp.get_pixels(block[5], ptr_cr, frame->linesize[2]);
        for (i = 4; i < 6; i++)
            a->fdsp.fdct(block[i]);
    }
}

static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                        const AVFrame *pict, int *got_packet)
{
    ASV1Context *const a = avctx->priv_data;
    int size, ret;
    int mb_x, mb_y;

    if (!pkt->data &&
        (ret = av_new_packet(pkt, a->mb_height * a->mb_width * MAX_MB_SIZE +
                             FF_MIN_BUFFER_SIZE)) < 0) {
        av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
        return ret;
    }

    init_put_bits(&a->pb, pkt->data, pkt->size);

    for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
        for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
            dct_get(a, pict, mb_x, mb_y);
            encode_mb(a, a->block);
        }
    }

    if (a->mb_width2 != a->mb_width) {
        mb_x = a->mb_width2;
        for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
            dct_get(a, pict, mb_x, mb_y);
            encode_mb(a, a->block);
        }
    }

    if (a->mb_height2 != a->mb_height) {
        mb_y = a->mb_height2;
        for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
            dct_get(a, pict, mb_x, mb_y);
            encode_mb(a, a->block);
        }
    }
    emms_c();

    avpriv_align_put_bits(&a->pb);
    while (put_bits_count(&a->pb) & 31)
        put_bits(&a->pb, 8, 0);

    size = put_bits_count(&a->pb) / 32;

    if (avctx->codec_id == AV_CODEC_ID_ASV1) {
        a->bbdsp.bswap_buf((uint32_t *) pkt->data,
                           (uint32_t *) pkt->data, size);
    } else {
        int i;
        for (i = 0; i < 4 * size; i++)
            pkt->data[i] = ff_reverse[pkt->data[i]];
    }

    pkt->size   = size * 4;
    pkt->flags |= AV_PKT_FLAG_KEY;
    *got_packet = 1;

    return 0;
}

static av_cold int encode_init(AVCodecContext *avctx)
{
    ASV1Context *const a = avctx->priv_data;
    int i;
    const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;

    avctx->coded_frame = av_frame_alloc();
    if (!avctx->coded_frame)
        return AVERROR(ENOMEM);
    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
    avctx->coded_frame->key_frame = 1;

    ff_asv_common_init(avctx);
    ff_fdctdsp_init(&a->fdsp, avctx);
    ff_pixblockdsp_init(&a->pdsp, avctx);

    if (avctx->global_quality == 0)
        avctx->global_quality = 4 * FF_QUALITY_SCALE;

    a->inv_qscale = (32 * scale * FF_QUALITY_SCALE +
                     avctx->global_quality / 2) / avctx->global_quality;

    avctx->extradata                   = av_mallocz(8);
    avctx->extradata_size              = 8;
    ((uint32_t *) avctx->extradata)[0] = av_le2ne32(a->inv_qscale);
    ((uint32_t *) avctx->extradata)[1] = av_le2ne32(AV_RL32("ASUS"));

    for (i = 0; i < 64; i++) {
        int q = 32 * scale * ff_mpeg1_default_intra_matrix[i];
        a->q_intra_matrix[i] = ((a->inv_qscale << 16) + q / 2) / q;
    }

    return 0;
}

static av_cold int asv_encode_close(AVCodecContext *avctx)
{
    av_frame_free(&avctx->coded_frame);

    return 0;
}

#if CONFIG_ASV1_ENCODER
AVCodec ff_asv1_encoder = {
    .name           = "asv1",
    .long_name      = NULL_IF_CONFIG_SMALL("ASUS V1"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_ASV1,
    .priv_data_size = sizeof(ASV1Context),
    .init           = encode_init,
    .encode2        = encode_frame,
    .close          = asv_encode_close,
    .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
                                                     AV_PIX_FMT_NONE },
};
#endif

#if CONFIG_ASV2_ENCODER
AVCodec ff_asv2_encoder = {
    .name           = "asv2",
    .long_name      = NULL_IF_CONFIG_SMALL("ASUS V2"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_ASV2,
    .priv_data_size = sizeof(ASV1Context),
    .init           = encode_init,
    .encode2        = encode_frame,
    .close          = asv_encode_close,
    .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
                                                     AV_PIX_FMT_NONE },
};
#endif