static int mov_text_decode_frame(AVCodecContext *avctx,
                            void *data, int *got_sub_ptr, AVPacket *avpkt)
{
    AVSubtitle *sub = data;
    MovTextContext *m = avctx->priv_data;
    int ret;
    AVBPrint buf;
    char *ptr = avpkt->data;
    char *end;
    int text_length, tsmb_type, ret_tsmb;
    uint64_t tsmb_size;
    const uint8_t *tsmb;
    if (!ptr || avpkt->size < 2)
        return AVERROR_INVALIDDATA;
    /*
     * A packet of size two with value zero is an empty subtitle
     * used to mark the end of the previous non-empty subtitle.
     * We can just drop them here as we have duration information
     * already. If the value is non-zero, then it's technically a
     * bad packet.
     */
    if (avpkt->size == 2)
        return AV_RB16(ptr) == 0 ? 0 : AVERROR_INVALIDDATA;
    /*
     * The first two bytes of the packet are the length of the text string
     * In complex cases, there are style descriptors appended to the string
     * so we can't just assume the packet size is the string size.
     */
    text_length = AV_RB16(ptr);
    end = ptr + FFMIN(2 + text_length, avpkt->size);
    ptr += 2;
    tsmb_size = 0;
    m->tracksize = 2 + text_length;
    m->style_entries = 0;
    m->box_flags = 0;
    m->count_s = 0;
    // Note that the spec recommends lines be no longer than 2048 characters.
    av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
    if (text_length + 2 != avpkt->size) {
        while (m->tracksize + 8 <= avpkt->size) {
            // A box is a minimum of 8 bytes.
            tsmb = ptr + m->tracksize - 2;
            tsmb_size = AV_RB32(tsmb);
            tsmb += 4;
            tsmb_type = AV_RB32(tsmb);
            tsmb += 4;
            if (tsmb_size == 1) {
                if (m->tracksize + 16 > avpkt->size)
                    break;
                tsmb_size = AV_RB64(tsmb);
                tsmb += 8;
                m->size_var = 16;
            } else
                m->size_var = 8;
            //size_var is equal to 8 or 16 depending on the size of box
            if (tsmb_size == 0) {
                av_log(avctx, AV_LOG_ERROR, "tsmb_size is 0\n");
                return AVERROR_INVALIDDATA;
            }
            if (tsmb_size > avpkt->size - m->tracksize)
                break;
            for (size_t i = 0; i < box_count; i++) {
                if (tsmb_type == box_types[i].type) {
                    if (m->tracksize + m->size_var + box_types[i].base_size > avpkt->size)
                        break;
                    ret_tsmb = box_types[i].decode(tsmb, m, avpkt);
                    if (ret_tsmb == -1)
                        break;
                }
            }
            m->tracksize = m->tracksize + tsmb_size;
        }
        text_to_ass(&buf, ptr, end, m);
    } else
        text_to_ass(&buf, ptr, end, m);
    ret = ff_ass_add_rect(sub, buf.str, m->readorder++, 0, NULL, NULL);
    av_bprint_finalize(&buf, NULL);
    if (ret < 0)
        return ret;
    *got_sub_ptr = sub->num_rects > 0;
    return avpkt->size;
}
static int mov_text_decode_frame(AVCodecContext *avctx,
                            void *data, int *got_sub_ptr, AVPacket *avpkt)
{
    AVSubtitle *sub = data;
    MovTextContext *m = avctx->priv_data;
    int ret;
    AVBPrint buf;
    char *ptr = avpkt->data;
    char *end;
    int text_length, tsmb_type, ret_tsmb;
    uint64_t tsmb_size;
    const uint8_t *tsmb;
    if (!ptr || avpkt->size < 2)
        return AVERROR_INVALIDDATA;
    






    if (avpkt->size == 2)
        return AV_RB16(ptr) == 0 ? 0 : AVERROR_INVALIDDATA;
    




    text_length = AV_RB16(ptr);
    end = ptr + FFMIN(2 + text_length, avpkt->size);
    ptr += 2;
    tsmb_size = 0;
    m->tracksize = 2 + text_length;
    m->style_entries = 0;
    m->box_flags = 0;
    m->count_s = 0;
    
    av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
    if (text_length + 2 != avpkt->size) {
        while (m->tracksize + 8 <= avpkt->size) {
            
            tsmb = ptr + m->tracksize - 2;
            tsmb_size = AV_RB32(tsmb);
            tsmb += 4;
            tsmb_type = AV_RB32(tsmb);
            tsmb += 4;
            if (tsmb_size == 1) {
                if (m->tracksize + 16 > avpkt->size)
                    break;
                tsmb_size = AV_RB64(tsmb);
                tsmb += 8;
                m->size_var = 16;
            } else
                m->size_var = 8;
            
            if (tsmb_size == 0) {
                av_log(avctx, AV_LOG_ERROR, "tsmb_size is 0\n");
                return AVERROR_INVALIDDATA;
            }
            if (tsmb_size > avpkt->size - m->tracksize)
                break;
            for (size_t i = 0; i < box_count; i++) {
                if (tsmb_type == box_types[i].type) {
                    if (m->tracksize + m->size_var + box_types[i].base_size > avpkt->size)
                        break;
                    ret_tsmb = box_types[i].decode(tsmb, m, avpkt);
                    if (ret_tsmb == -1)
                        break;
                }
            }
            m->tracksize = m->tracksize + tsmb_size;
        }
        text_to_ass(&buf, ptr, end, m);
    } else
        text_to_ass(&buf, ptr, end, m);
    ret = ff_ass_add_rect(sub, buf.str, m->readorder++, 0, NULL, NULL);
    av_bprint_finalize(&buf, NULL);
    if (ret < 0)
        return ret;
    *got_sub_ptr = sub->num_rects > 0;
    return avpkt->size;
}
static int FUNC_0(AVCodecContext *VAR_0,
                            void *VAR_1, int *VAR_2, AVPacket *VAR_3)
{
    AVSubtitle *sub = VAR_1;
    MovTextContext *m = VAR_0->priv_data;
    int VAR_4;
    AVBPrint buf;
    char *VAR_5 = VAR_3->VAR_1;
    char *VAR_6;
    int VAR_7, VAR_8, VAR_9;
    uint64_t tsmb_size;
    const uint8_t *VAR_10;
    if (!VAR_5 || VAR_3->size < 2)
        return AVERROR_INVALIDDATA;
    






    if (VAR_3->size == 2)
        return AV_RB16(VAR_5) == 0 ? 0 : AVERROR_INVALIDDATA;
    




    VAR_7 = AV_RB16(VAR_5);
    VAR_6 = VAR_5 + FFMIN(2 + VAR_7, VAR_3->size);
    VAR_5 += 2;
    tsmb_size = 0;
    m->tracksize = 2 + VAR_7;
    m->style_entries = 0;
    m->box_flags = 0;
    m->count_s = 0;
    
    av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
    if (VAR_7 + 2 != VAR_3->size) {
        while (m->tracksize + 8 <= VAR_3->size) {
            
            VAR_10 = VAR_5 + m->tracksize - 2;
            tsmb_size = AV_RB32(VAR_10);
            VAR_10 += 4;
            VAR_8 = AV_RB32(VAR_10);
            VAR_10 += 4;
            if (tsmb_size == 1) {
                if (m->tracksize + 16 > VAR_3->size)
                    break;
                tsmb_size = AV_RB64(VAR_10);
                VAR_10 += 8;
                m->size_var = 16;
            } else
                m->size_var = 8;
            
            if (tsmb_size == 0) {
                av_log(VAR_0, AV_LOG_ERROR, "tsmb_size is 0\n");
                return AVERROR_INVALIDDATA;
            }
            if (tsmb_size > VAR_3->size - m->tracksize)
                break;
            for (size_t i = 0; i < box_count; i++) {
                if (VAR_8 == box_types[i].type) {
                    if (m->tracksize + m->size_var + box_types[i].base_size > VAR_3->size)
                        break;
                    VAR_9 = box_types[i].decode(VAR_10, m, VAR_3);
                    if (VAR_9 == -1)
                        break;
                }
            }
            m->tracksize = m->tracksize + tsmb_size;
        }
        text_to_ass(&buf, VAR_5, VAR_6, m);
    } else
        text_to_ass(&buf, VAR_5, VAR_6, m);
    VAR_4 = ff_ass_add_rect(sub, buf.str, m->readorder++, 0, NULL, NULL);
    av_bprint_finalize(&buf, NULL);
    if (VAR_4 < 0)
        return VAR_4;
    *VAR_2 = sub->num_rects > 0;
    return VAR_3->size;
}
static int FUNC_0(AVCodecContext *VAR_0,
void *VAR_1, int *VAR_2, AVPacket *VAR_3)
{ AVSubtitle *sub = VAR_1; MovTextContext *m = VAR_0->priv_data; int VAR_4; AVBPrint buf; char *VAR_5 = VAR_3->VAR_1; char *VAR_6; int VAR_7, VAR_8, VAR_9; uint64_t tsmb_size; const uint8_t *VAR_10; if (!VAR_5 || VAR_3->size < 2)
return AVERROR_INVALIDDATA; if (VAR_3->size == 2)
return AV_RB16(VAR_5) == 0 ? 0 : AVERROR_INVALIDDATA; VAR_7 = AV_RB16(VAR_5); VAR_6 = VAR_5 + FFMIN(2 + VAR_7, VAR_3->size); VAR_5 += 2; tsmb_size = 0; m->tracksize = 2 + VAR_7; m->style_entries = 0; m->box_flags = 0; m->count_s = 0; av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); if (VAR_7 + 2 != VAR_3->size) { while (m->tracksize + 8 <= VAR_3->size) { VAR_10 = VAR_5 + m->tracksize - 2; tsmb_size = AV_RB32(VAR_10); VAR_10 += 4; VAR_8 = AV_RB32(VAR_10); VAR_10 += 4; if (tsmb_size == 1) { if (m->tracksize + 16 > VAR_3->size)
break; tsmb_size = AV_RB64(VAR_10); VAR_10 += 8; m->size_var = 16; } else m->size_var = 8; if (tsmb_size == 0) { av_log(VAR_0, AV_LOG_ERROR, "tsmb_size is 0\n"); return AVERROR_INVALIDDATA; } if (tsmb_size > VAR_3->size - m->tracksize)
break; for (size_t i = 0; i < box_count; i++) { if (VAR_8 == box_types[i].type) { if (m->tracksize + m->size_var + box_types[i].base_size > VAR_3->size)
break; VAR_9 = box_types[i].decode(VAR_10, m, VAR_3); if (VAR_9 == -1)
break; } } m->tracksize = m->tracksize + tsmb_size; } text_to_ass(&buf, VAR_5, VAR_6, m); } else text_to_ass(&buf, VAR_5, VAR_6, m); VAR_4 = ff_ass_add_rect(sub, buf.str, m->readorder++, 0, NULL, NULL); av_bprint_finalize(&buf, NULL); if (VAR_4 < 0)
return VAR_4; *VAR_2 = sub->num_rects > 0; return VAR_3->size; }