avcodec: add IPU Video decoder and parser

1 files changed, 155 insertions, 0 deletions

diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
index ab470187a1..1dd12196b9 100644
--- a/libavcodec/mpeg12dec.c
+++ b/libavcodec/mpeg12dec.c
@@ -2984,3 +2984,158 @@ AVCodec ff_mpegvideo_decoder = {
     .flush          = flush,
     .max_lowres     = 3,
 };
+
+typedef struct IPUContext {
+    MpegEncContext m;
+
+    int flags;
+    DECLARE_ALIGNED(32, int16_t, block)[6][64];
+} IPUContext;
+
+static int ipu_decode_frame(AVCodecContext *avctx, void *data,
+                            int *got_frame, AVPacket *avpkt)
+{
+    IPUContext *s = avctx->priv_data;
+    MpegEncContext *m = &s->m;
+    GetBitContext *gb = &m->gb;
+    AVFrame * const frame = data;
+    int ret;
+
+    ret = ff_get_buffer(avctx, frame, 0);
+    if (ret < 0)
+        return ret;
+
+    ret = init_get_bits8(gb, avpkt->data, avpkt->size);
+    if (ret < 0)
+        return ret;
+
+    s->flags = get_bits(gb, 8);
+    if (!(s->flags & 0x80)) {
+        m->intra_dc_precision = s->flags & 3;
+        m->q_scale_type = !!(s->flags & 0x40);
+        m->intra_vlc_format = !!(s->flags & 0x20);
+        m->alternate_scan = !!(s->flags & 0x10);
+
+        if (s->flags & 0x10) {
+            ff_init_scantable(m->idsp.idct_permutation, &m->inter_scantable, ff_alternate_vertical_scan);
+            ff_init_scantable(m->idsp.idct_permutation, &m->intra_scantable, ff_alternate_vertical_scan);
+        } else {
+            ff_init_scantable(m->idsp.idct_permutation, &m->inter_scantable, ff_zigzag_direct);
+            ff_init_scantable(m->idsp.idct_permutation, &m->intra_scantable, ff_zigzag_direct);
+        }
+
+        m->last_dc[0] = m->last_dc[1] = m->last_dc[2] = 1 << (7 + (s->flags & 3));
+    }
+    m->qscale = 1;
+
+    for (int y = 0; y < avctx->height; y += 16) {
+        int intraquant;
+
+        for (int x = 0; x < avctx->width; x += 16) {
+            if (x || y) {
+                if (!get_bits1(gb))
+                    return AVERROR_INVALIDDATA;
+            }
+            if (get_bits1(gb)) {
+                intraquant = 0;
+            } else {
+                if (!get_bits1(gb))
+                    return AVERROR_INVALIDDATA;
+                intraquant = 1;
+            }
+
+            if (s->flags & 4)
+                skip_bits1(gb);
+
+            if (intraquant)
+                m->qscale = mpeg_get_qscale(m);
+
+            memset(s->block, 0, sizeof(s->block));
+
+            for (int n = 0; n < 6; n++) {
+                if (s->flags & 0x20)
+                    ret = mpeg2_decode_block_intra(m, s->block[n], n);
+                else
+                    ret = mpeg2_decode_block_non_intra(m, s->block[n], n);
+                if (ret < 0)
+                    return ret;
+            }
+
+            m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
+                             frame->linesize[0], s->block[0]);
+            m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
+                             frame->linesize[0], s->block[1]);
+            m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
+                             frame->linesize[0], s->block[2]);
+            m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
+                             frame->linesize[0], s->block[3]);
+            m->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
+                             frame->linesize[1], s->block[4]);
+            m->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
+                             frame->linesize[2], s->block[5]);
+        }
+    }
+
+    align_get_bits(gb);
+    if (get_bits_left(gb) != 32)
+        return AVERROR_INVALIDDATA;
+
+    frame->pict_type = AV_PICTURE_TYPE_I;
+    frame->key_frame = 1;
+    *got_frame = 1;
+
+    return avpkt->size;
+}
+
+static av_cold int ipu_decode_init(AVCodecContext *avctx)
+{
+    IPUContext *s = avctx->priv_data;
+    MpegEncContext *m = &s->m;
+
+    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+
+    ff_mpv_decode_defaults(m);
+    ff_mpv_decode_init(m, avctx);
+    s->m.avctx = avctx;
+    ff_mpv_idct_init(m);
+    ff_mpeg12_common_init(m);
+    ff_mpeg12_init_vlcs();
+
+    for (int i = 0; i < 64; i++) {
+        int j = m->idsp.idct_permutation[i];
+        int v = ff_mpeg1_default_intra_matrix[i];
+        m->intra_matrix[j]        = v;
+        m->chroma_intra_matrix[j] = v;
+    }
+
+    for (int i = 0; i < 64; i++) {
+        int j = m->idsp.idct_permutation[i];
+        int v = ff_mpeg1_default_non_intra_matrix[i];
+        m->inter_matrix[j]        = v;
+        m->chroma_inter_matrix[j] = v;
+    }
+
+    return 0;
+}
+
+static av_cold int ipu_decode_end(AVCodecContext *avctx)
+{
+    IPUContext *s = avctx->priv_data;
+
+    ff_mpv_common_end(&s->m);
+
+    return 0;
+}
+
+AVCodec ff_ipu_decoder = {
+    .name           = "ipu",
+    .long_name      = NULL_IF_CONFIG_SMALL("IPU Video"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_IPU,
+    .priv_data_size = sizeof(IPUContext),
+    .init           = ipu_decode_init,
+    .decode         = ipu_decode_frame,
+    .close          = ipu_decode_end,
+    .capabilities   = AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
+};